What is the difference between solid silica gel with liquid silicone?
Common silicone shell is divided into solid silica gel and liquid silicone, do you know the difference between the solid silica gel and liquid silicone?
Solid silicone industry based on sodium silicate (sodium silicate) as raw material, hydrolysis produce gel in the acid medium, and then made from silica gel by aging, washing, drying process, according to the water content is different, for the translucent or white solid. Goods sold are irregular granular, globular, micro spherical silica gel, which has good wear resistance, used as the catalyst carrier in fluidized bed operation.
When used as catalyst carrier, is usually the silicone impregnated in solution containing catalytic active component, make the solution absorption in silica gel inside the pore, drying, activation and other procedures, the active component in the silicone surface. Made of silica gel pore structure on the nature of the load type catalyst has important influence, such as pore volume, pore size distribution of silica gel, etc. Traditionally, the average pore diameter is less than 15 ~ 20 a silica gel, said fine silica; The average pore diameter greater than 40 ~ 50 a, called the coarse silica gel. Fine pore structure of the silica gel with high specific surface area, which is beneficial to catalytic dispersion of active components. But fine pore structure is not conducive to the spread of the reactant molecules, reach hidden deep in the depths of the pore of the catalytic active component, thus will reduce the catalyst utilization rate of the inner surface, and deep in the pores generated by the product molecules escape hole, not easily also easy to cause deep side effects. Silica gel on the pore structure and manufacturing method and condition, such as gelling, aging, washing of pH, temperature, time, etc. By reaming process will be commercially available silicone reaming, common method is to place it in the hot kettle of water or add salt aqueous solution (such as sodium carbonate, sodium acetate) extrusion processing, for example: at 320 ℃, 10 mpa hot-pressing process can make the surface and average pore diameter than 135 m2 / g and 123 a respectively of silica gel to 26.9 m2 / g and 508 a.
In addition to the solid silica gel, silica sol liquid silicon sol is important carrier of the material, industry usually by ion exchange method makes the silica sol sodium silicate sodium off system. It is translucent milky liquid, the content of silica in the sold goods is commonly 20% ~ 30%, and the most high is 50%, the colloidal particles diameter of 100 ~ 200 a, some items of 1300 a. A high concentration of silica sol is usually with the aid of trace amounts of sodium oxide to maintain its stability. Colloidal silica drying after into porous solids. For example, in production by oxidation of propylene ammoniation of acrylonitrile (oxygen) phosphorus molybdenum - bi - / silicon oxide catalyst, is to contain active component solution mixed with silica sol, the spray drying method into micro spherical catalyst.
Organic silicon rubber by linear polysiloxane with reinforcing filler, under the condition of heating pressure sulfide generated special synthetic elastomer. It perfectly balanced mechanical properties and chemical properties, and thus can satisfy the requirement of many demanding applications today.
High performance of silicone rubber in the following areas:
1, high and low temperature stability
2, the inert (and tasteless, odourless)
3, transparent, easy to color
4, wide range of hardness, 10-80 Shao Er hardness
5, resistant to chemicals used in
6, weather resistance,
7, the sealing performance
8 and electrical properties
9, resistant to compression deformation
In addition to the outstanding performance, compared with conventional organic elastomer, silicone rubber are particularly easy to manufacture. Silicone rubber easy flow, thus it can be in mold under the condition of low energy consumption, calendering, extrusion. Easy processing means high production efficiency.
Silicone rubber can provide the following form:
Mixing adhesive: this ready-to-use materials can be according to your color and catalytic processing equipment and end use.
Base material: this kind of silicone polymer also contains reinforcing filler. Rubber base material can be further and pigments and additives mixed, mixed gel formation, meet your color and other manufacturing requirements.
Liquid silicone: this two-component liquid rubber system can enter the appropriate pump injection molding equipment, and then the thermal curing into molded rubber parts.
Fluorine and silicone rubber mixing glue and base material: fluorine and silicone rubber keep many of the key properties of organic silicon, in addition, it also has excellent resistance to chemicals, fuel and oil resistance.
Liquid, raw material costs and the cost of production, is a solid-state high. To make the finished product, basically is not easy to distinguish.
Why the mold silicone curing so slow?
Why the mold silicone curing so slow?
Must have a lot of friends have this problem, when we are making silicone mold, mold the silicone 24 hours due to some reason will not curing phenomenon, today we will analyze how to control the silica gel and the proportion of curing agent to avoid not curing phenomenon.
Mold silicone curing will be affected by temperature, high temperature fast curing speed, on the contrary, low temperature curing speed will slow down, so when entering the winter weather will be appropriate when the production of silicone mold surface instead of silicone and curing agent ratio to guarantee the normal curing of silica gel.
The greater the amount of curing agent added silica gel reaction speed faster, the proportion of curing agent and silica gel at least not less than 1%. If the amount of curing agent added too little for a long time won't cure. Curing agent added less than 5% generally on silica gel hardness, tensile and tear strength will not have much impact.
1) amount of curing agent added 1%, 2.5 hours colloid is in flow, can release 6 to 8 hours.
(2) the amount of curing agent added 2%, 50 minutes to 1 hour and fluidity, Hugh will also can release 2 to 3 hours.
(3) amount of curing agent added 3%, 28 to 30 minutes colloid in flow, also can release 1.5-2 hours.
(4) amount of curing agent added 4%, 10-15 minutes colloid in flow, 1-1.5 hours can release.
Silica gel after curing agent added to mold the silicone must stir well, if there is no uniform mixing, part not fixed-line phenomenon occurs, if there is no fixed place 48 hours later can't fixed, the mould was discarded, won't cure, can only change it to make the mold after clean.
Some common problems when using silicone mold labeling solutions
When using liquid mold silicone compound die often we will encounter some problems, such as fewer bubbles, not curing, rolling over, today we together to discuss the common problem is what causes and how to avoid these problems.
Ask the mold silicone rolling over less what reason be?
A: in the process of making mould add too much silicone oil, silicone oil destroyed the molecular weight of the silica gel, the mould will be rolling over to the phenomenon such as less durable. If do small decorative pattern more complex products, with high hardness of silica gel to open mold, can appear the phenomenon of fewer rolling over, because the silicone hard time will be very fragile, easily broken. On the contrary, if make building products with small hardness of silica gel to do the mold, the results also is not satisfied. Because the silicone is too soft, its tensile and tear strength will reduce, make the mould will change shape, so will reduce number of rolling over.
Ask the silicon mold made at oil what reason be?
A: mold silicone itself is not taking oil, appeared to take oil is because of the complex silicone oil is added in the operating process (silicone oil and white mineral oil complex ligand), because the white mineral oil is oil chemical products, not silicone oil.
Ask the silicon mold made poor resistance to tear what reason be?
A: because the customer in the process of making mould, in order to reduce the viscosity of the silica gel, the silica gel is easy to operation and a large amount of added silicone oil in the silica gel, this will make silicone is very soft, not resistant, pull, tear strength is reduced, the phenomenon of tension variation.
Ask die mold silicone appear to burn what reason be?
Answer: because of unsaturated resins and resin products with peroxide curing agent, reaction in the resin will produce a lot of heat, general resin curing time for 3 minutes, so after 3 minutes to release as soon as possible, to prevent the silicone mold won't produce the phenomenon that burn mode.
Ask the silicon mold made ageing resistance ability is bad what reason be?
Answer: in the process of making silicone mold, we suggest that the customer had better do not add any silicone oil, if necessary, silicone oil to add up to not more than 5% ~ 10%. Because the amount of silicone oil to add too much can destroy the molecular weight of silica gel, so the mold to produce not resistant to acid and alkali, not resistant to ageing phenomenon.
Ask the silicon mold made matte what reason be?
A: the phenomenon is not to copy products or model of grinding or polishing. Because in fact the model or the product itself is not enough smooth or perfect, so to copy products or model if without grinding or polishing, again good made of silicone mold will not beautiful, not smooth enough. Another is that playing release agent, not besmear brushs homogeneous can cause mould is not smooth.
Ask cured silicone mold parts do not stem what reason be?
A: mold silicone is by absorbing moisture in the air and curing, silica gel in the process of making the water boiled, without calling in just the right amount of moisture, can appear the phenomenon. Solution: this phenomenon does not belong to quality problems, but because of who I am without control water, improve the shelf life of silicone, long shelf life will appear some phenomenon, as long as in the use of silica gel, add 0.05% water, stir evenly can solve some conditions.
Following from the printer to print following design steps
Following from the printer to print following design steps
Tool use: 1. 2. The following from UV printer environmentally friendly UV curing ink 3. Common following
Following from the printer to print following steps:
Step 1. First to clean the following scrub with a clean cloth
Step 2. We want to make a photo copy of the laptop. The best thing is to the picture of the pixels high.
Step 3. The computer is connected with our printer, open the printer to test printer is working correctly!
Step 4. The following blank, on the platform of printer, adjust the height of nozzle, click on the print button in my computer.
Step 5. Remove the following from completion, if you need relief feeling strong, can repeat the print can!
Note: 1. If you want to print the feel is strong point, you can print white ink in the turn ratio is high. 2. Be sure to wait until after UV lights up, then operate. 3. The following printer normal product parameter working voltage: 110-240 - v; Power: 35 w; Day allows working hours: 24 hours; The print width: 450 mm * 500 mm; Substrates height: 50 mm or less; Substrates weight: 15 kg or less; Print accuracy: 720 dpi.
The working principle and using method of silica gel desiccant
The working principle and using method of silica gel desiccant
Silica gel desiccant is a highly active adsorption material, usually is to use sodium silicate and sulfuric acid reaction, and the aging, acid soak and a series of post-processing process and system. Silica gel is amorphous material, its chemical formula is mSiO2. NH2o. Insoluble in water and any solvents, non-toxic tasteless, chemical properties not disorderly, in addition to the strong alkali, hydrofluoric acid does not react with any material. Chemical components and physical structure of the silica gel, determines it has many other features of similar materials difficult to replace: high adsorption function, hot not disorderly, chemical properties not disorderly, such as high mechanical strength. This product is moisture permeability small bags of different varieties of silica gel, the main raw material high silica gel is a kind of micro pore structure of hydrated silica, non-toxic, tasteless, odorless, chemical properties not disorderly, with a strong moisture absorption function. And therefore is widely used in instruments, meters, instruments, leather, bags, footwear, textiles, food, medicine and other relative humidity of the storage and transportation of control environment, to prevent the goods be affected with damp be affected with damp, mildew and rust. Its various technical indicators for packing desiccant and basis, repair maintenance methods are clearly defined. Consult our customer service staff for the scale. The function of the safety of silica gel: silicone has very strong adsorption capacity, drying effect on a person's skin, therefore, manipulation should wear good clothes. If silica gel into the eyes, need a lot of water erosion, and find a doctor as soon as possible. type
Wrapping active desiccant, according to its USES are divided into the following several types: type 1, 2, general purpose no dust type 3, specific use (more than 400 grams) particle size
Size: 1-3 mm or 2-5 mm silica gel desiccant - related quality indicators
Quality indicators meet GB10455-89 (or the user agreement)
Unit adsorption capacity, adsorption amount of RH = 20% when 10% RH = 40% or higher acuity 20% RH = 90% when 30% or higher
Note: according to scale: GB10455-89 in RH = 90% qualified products 28% or higher grade a classy article or 29% to 30% or higher packaging specifications
Commonly used specifications shown in the following table (agreed) special specifications can be packing
Lined with plastic sheets, external use corrugated carton, each package comes with a humidity indicator CARDS (RH10 % + / - 5%) instructions (generally use at least amount) note: at least usage refers to the use of in welding sealing iron container, whatever in damp environment and use wooden case lined with plastic bag packaging packaging, should use double the amount of 1, pores, silica gel desiccant:
The appearance of the product is white, translucent vitreous body. Mainly used for drying, moisture, can be used as a catalyst carrier and the dehydration of refined organic compounds. Because of its high packing density and low humidity characteristics of moisture absorption effect is remarkable. Can be used as air purifiers, remove the moisture in the air to control the humidity of the air. Also has a wide application in the sea, also can be used as a desiccant between two layers of parallel sealing glass, can keep the transparency of glass. 2, household type of desiccant (wet, small indoor sunshine will g) :
Has the function of the wetted, mouldproof, deodorant, blue indicator is the main life said, when it changed from blue to pink is that life has to. Wet will g major is electronic special equipment, such as computers, cameras, Trinidad mirror etc. Indoor small sunshine is special wardrobe.
Scope of application: silica gel desiccant is to put the silica gel seal in different packaging material made of different grams of small packaging, ranging from 0.5 g to 1000 g in weight. Mainly used as a desiccant, moistureproof beads, in addition to flavor agent and various adsorbent. Silica gel desiccant is a highly efficient hygroscopic material, widely used in instruments, meters, instruments, leather, bags, footwear, textiles, food, seed, tea, medicine, cultural relic archives, cameras, arts and crafts, such as the storage and transportation of environmental relative humidity control and prevent the goods be affected with damp be affected with damp, mildew and rust. Have wide application in shipping on the way at the same time, due to the goods in transit due to large temperature be affected with damp be affected with damp, with the product can be effective to wet moistureproof, guaranteeing the quality of the goods. Properties:
Silica gel desiccant is a traditional moisture absorption dehumidification packing seal products. The silica gel has won the gold medal, won the ISO 9001 quality system certification. Pore silica gel pores spherical silica gel and stoma block silica gel two kinds. Pores of spherical silica gel appearance is colorless or yellowish transparent or semi-transparent spherical particles, the pore block silica gel is colorless or light yellow translucent vitreous irregular particles. Of fine silica, also called type A silica gel. It usually is to use sodium silicate and sulfuric acid reaction, and the aging, made by acid soak and a series of post-treatment process. Belong to the amorphous silicate material, its chemical formula mSiO2. NH2O. Insoluble in water and any solvents. Avirulent insipidity, chemical properties not disorderly, in addition to the strong alkali, hydrofluoric acid does not react with any material. Various types of silicone because of the different manufacturing methods and form different microporous structure. Chemical group and physical structure of silica gel, determines it has many other features of similar materials difficult to replace: high adsorption function, hot not disorderly, chemical properties not disorderly, such as high mechanical strength. Scope of application: silica gel desiccant is to put the silica gel seal in different packaging material made of different grams of small packaging, ranging from 0.5 g to 1000 g in weight. Mainly used as a desiccant, moistureproof beads, in addition to flavor agent and various adsorbent. Silica gel desiccant is a highly efficient hygroscopic material, widely used in instruments, meters, instruments, leather, bags, footwear, textiles, food, seed, tea, medicine, cultural relic archives, cameras, arts and crafts, such as the storage and transportation of environmental relative humidity control and prevent the goods be affected with damp be affected with damp, mildew and rust. Have wide application in shipping on the way at the same time, due to the goods in transit due to large temperature be affected with damp be affected with damp, with the product can be effective to wet moistureproof, guaranteeing the quality of the goods. (2) the function of the safety of silica gel
, the chemical properties of silica gel was mostly silica, don't burn. Silica gel is a kind of amorphous silica, should control the workshop dust content is not more than 10 mg/m3, need to be reinforced platoon wind, manipulation when wearing a mask. Silica gel has a strong adsorption ability, drying effect on a person's skin, therefore, manipulation should wear good clothes. If silica gel into the eyes, need a lot of water erosion, and find a doctor as soon as possible. (3) storage and packaging
Silica gel has a strong ability of moisture absorption, so should be stored in a dry place. Between packing and ground to be put aside frame. Packaging has a steel drum, drum, paper box, plastic bottles, polyethylene plastic compound bag, flexible container bags, etc. The classification of the product packaging specifications are as in detail. In the process of transportation should avoid to drench, be affected with damp be affected with damp, and sunlight.
Add: silica gel regeneration method and the attention to matters
Silica gel in use process because of the medium water vapor adsorption or other organic substances, adsorption ability, can be regenerated through repeated use.
A, silica gel regeneration after adsorption of water vapor
Silica gel after moisture absorption, heat by stripping way to remove moisture, there are many types of heating way, such as electric heating furnace, flue waste heat heating and hot air drying, etc.
Stripping heating temperature control in the 120-180 ℃ advisable, for the blue gel indicator, allochroic silica gel, DL blue silica gel is controlled in 100-120 ℃ advisable. All kinds of industrial silica gel regeneration when the highest temperature should not be more than the following limits: coarse silica gel is not higher than 600 ℃; Of fine silica shall not be higher than 200 ℃;
Blue glue index agent (or color silica gel) shall not be higher than 120 ℃; Silicon aluminum adhesive shall not be higher than 350 ℃.
After the regeneration of silica gel, its general control moisture below 2% can be put into use again.
Second, the silica gel regeneration roasting method after the adsorption of organic impurities
For coarse silica gel, and can be put inside furnace heats up to 500-600 ℃, about the 6-8 hours to colloidal particles with a white or brown. For fine silica, roasting temperature should not exceed 200 ℃. 2. Rinse method
The silica gel in the saturated water vapor adsorption saturation after heat soak rinse, and can be combined with detergent to remove waste or other organic impurities, drying dehydration after water washing. 3. Solvent washing method
According to the silica gel adsorption organic matter types, choose the appropriate solvent adsorption in silica gel dissolution of organic matter, and then heat the silica gel to removing solvent.
Three, silica gel regeneration should pay attention to the topic
drying regeneration temperature should be pay attention to grasp the gradual progress, in order to avoid severe dry cause colloidal particle cracking, reduce the recovery.
2. The silica gel regeneration, roasting temperature through high will cause the silica gel pore structure change and significantly reduce its adsorption effect, affect the use value. For the blue gel indicator or discolor silica gel, stripping regeneration temperature shall not exceed 120 ℃, otherwise you will lost due to gradual oxidation agent color effect.
3. After the regeneration of silica gel shall generally be sieve to remove fine particles, so that the average particle.
Why is the silicone products shiny?
High gloss finish is the symbol of high quality, high gloss is used in the production of silicone products and highly polished mold and create, this is the most expensive process but is to guarantee the smooth, nonporous surface to reinforce its non-stick properties. Silica gel itself is also a kind of things without any processing non-stick items, however, we have been suggested to obey the dirty version or flowering. Butter, go to our pan has very good effect.
How to cope with the extreme temperature silicone products?
Our silica gel melting point is 932 degrees Fahrenheit, however, using constant temperature is at 675 degrees. This means that our pan used continuously under 675 degrees Fahrenheit won't have any damage, can also be in 58 degrees Fahrenheit - continuous use.
High temperature silicone products will break down toxins?
High temperature silicone products will break down toxins?
People are in question, under the environment of high temperature silicone products will break out toxins, contact with silica gel products of food, the ingredients will be toxic, this question always has the consumer's mind, so that we Chinese people dare not to buy silicone articles for daily use such as silicone tableware, silicone products so our domestic silicone products in our country is not recognised by domestic consumers, the market will can't open it.
Then we have to talk, high temperature silicone products will break down toxins.
Silica gel is a kind of high pressure resistant, and environmental protection material, its temperature range of use: 60 ℃ ~ 200 ℃, will not happen any chemical reaction; And it is tasteless, does not decompose more colored object is harmless, health materials, their chemical substance is stable, the temperature of 200 degrees will not react.
In European and American countries, the somebody else a few years ago is common use of the silica gel products, silica gel tableware, etc. There are a lot of experience in technology, the world health organization (who) but also for our food material, more attention and care, is very strict with the production of silicone products, there is no standard can't production. So, you can rest assured use.
Title: high temperature silicone products will break down toxins?
What are your silicone products？
China · Shenzhen Ketaili Technology Co., Ltd is a Shenzhen professional, fast, high quality production of silicone products, silicone rubber products, mobile case, silica gel gifts, silica gel, silica gel, silica gel protective sleeve, silica gel supplies, silicone keys, adult supplies, silicone medical supplies, silicone kitchenware, silicone pad, tablet cases, silicone seals etc all kinds of silicone products, production manufacturers. 10-15 years the company has a silicone industry professional engineering team, can according to customer demand for the structure of the independent design and development work, to help customers from the perspective of professional prophase research work such as design and development.
What do you can make the silicone products process?
Ketaili silicone products process description: surface spraying, printing, two-color injection molding, wire drawing effect, on the back + laser cutting, sputtering plating, TPU silicone, silicone, PC film + + bottom bottom sheet steel, IMD + plastic, IMD + silica gel, Co - moulding, UV printing, PU matting technology! These companies are often used, have the ability to do the process
Silica gel products factory what is the key production technology of silicon?
When in the production of silicone buttons we were divided into 13 process, including the back surface spraying, printing, two-color injection molding, wire drawing effect, plating + laser cutting, coating process, TPU + bottom silicone, PC film, silica gel, and sheet steel, IMD + plastic, IMD + silica gel, Co - moulding, UV transfer printing. Craft sex not introduce one by one in detail, emphatically introduce our surface coating, surface coating, printing on the back, double color injection molding drawing effect and plating and laser cutting technology.
What do you can make the silicone products
Ketaili silicone products process description: surface spraying, printing, two-color injection molding, wire drawing effect, on the back + laser cutting, sputtering plating, TPU silicone, silicone, PC film + + bottom bottom sheet steel, IMD + plastic, IMD + silica gel, Co - moulding, UV printing, PU matting technology! These companies are often used, have the ability to do the process.