XJY-8205
Methyl Silicone MQ Resin
Methyl silicone MQ resin is a co-hydrolysis product of tetraalkoxy silane (Q unit) and trimethylalkoxy silane (M unit).
| Other Names | MQ resin, Silicic acid, Sodium salt, reaction products with chlorotrimethylsilane and iso-Pr alc |
|---|---|
| CAS Number | 68988-56-7 |
| Appearance | White Powder |
Description
MQ silicone resin is a relatively unique structure of silicone resin, which is a three-dimensional spherical structure of silicone grease generated by the co-hydrolysis-condensation reaction of silicone compounds containing tetrafunctional siloxane links (SiO4 /2, Q) and silicone compounds containing monofunctional siloxane links (R3SiO1/2, M).
Its molar mass generally ranges from 1000 to 8000 g/mol, has a state from viscous fluid to solid powder, is hard and brittle, and has a wide range of glass transition temperature (Tg).
It is generally believed that MQ silicone resin is a two-layer structure of compact spheres, in which the core is Si-O chain-linked, high-density, caged SiO2 with a degree of polymerization of 15 to 50, and the shell is a lower-density R3SiO1/2 layer.
XJY-8205 Methyl silicone MQ resin has great industrial application potential and a wide range of uses in personal care, adhesives, defoamers, and waterproofing agents, and with good high demolding power in release agents for polyurethane processing.
It is convenient to prepare modified resins for special purposes and to develop functional silicone MQ resin.
- 25 kg/cardboard drum. Packaging options are available upon request.
- It is suitable for storage in a dry and cool environment.
Specification
| Brand | XJY-8205-01 | XJY-8205-02 | XJY-8205-03 | XJY-8205-05 | XJY-8205-06 | XJY-8205-07 | XJY-8205-08 | XJY-8205-09 |
|---|---|---|---|---|---|---|---|---|
| Molecular Weight | 2500-4000 | 4000-6000 | 4000-6000 | 4000-8000 | 3000-6000 | 7000-12000 | / | / |
| M/Q Ratio | / | 0.8 | 0.6-0.7 | / | 0.6-0.8 | / | / | / |
| Hydroxyl Content | / | ＜0.5% | / | / | ||||
| Application |
Transparent condensation type PSA, industrial tackifying resin, defoamer, mold release agent. |
Platinum catalytic PSA | Defoamer | Waterproof material, Defoamer | ||||
Applications
- Reinforcing material
With MQ silicone resin as reinforcing agent, the liquid silicone rubber products have certain mechanical strength and high transmittance, and good fluidity of the rubber before vulcanization.
- Release agent:
For urethane rubber such as shoe sole. Improve the release durability performance of the release agent, for high adhesion resin (such as polyurethane, epoxy resin, etc.) the release effect is better.
- Waterproof material for polish
Excellent additive to enhance the water-repellent properties of automotive and domestic care systems. The structure of polysiloxane determines the silicone resin has hydrophobic, its contact angle with water is greater than 90 ° and is used in waterproof materials.
- Personal care and cosmetic field
Excellent film-forming performance. As a surface protective coating film, it can eliminate the sticky feeling of silicone oil, improve the slipperiness, scuff resistance and increase the gloss.
- Peeling regulator of molding anti-adhesive
vinyl MQ silicone resin can be used as peeling regulator of molding anti-adhesive.
- Silicone Defoamer
It can be used to prepare high-temperature and strong alkali-resistant silicone defoamers with good antifoam properties. The silicone defoamer also has the advantages of non-toxicity and environmental protection. By adding high-viscosity hydroxy silicone oil and silicone MQ resin to synthesize a network polymer with a high degree of branching, so as to improve the high-temperature resistance and strong alkali resistance of the defoamer.
- LED Encapsulation
The silicone MQ resin containing SiH groups or aralkyl groups is used as a crosslinking agent. Under the action of a platinum catalyst, a phenyl silicone resin-containing packaging material is synthesized with a silicone resin containing vinyl and high phenyl groups. The material is compatible and compatible. With good transparency, high hardness, and high refractive index, it can be used for LED packaging and lens production.
- Silicone Pressure Sensitive Adhesive(SPSA)
Silicone MQ resin mainly plays the role of tackifying and reinforcing. The silicone hydroxyl group or vinyl group in MQ resin can condense with the hydroxyl group of silicone rubber or with silicone rubber through hydrogen-containing siloxane under the action of catalyst, so as to prepare silicone pressure-sensitive adhesive.
- Other applications:
With MQ hydrogen-containing silicone oil and silyl enoate, under the catalysis of Pt, the hydrosilylation reaction occurs to obtain MQ resin-modified carboxyl silicone oil. It can be used in combination with amino silicone oil emulsion to give fabrics a better soft, smooth, and plump feel.
How to produce MQ resin?
MQ silicone resin is often prepared by sol-gel method, where the main raw material of M link is Hexamethyldisiloxane (MM) or Trimethyl monochlorosilane, and the raw material of Q link is mainly sodium silicate or tetraethyl orthosilicate (TEOS).
Due to the different raw materials of Q-link, it is mainly divided into the tetraethyl orthosilicate method and sodium silicate method.
- The product made by tetraethyl orthosilicate has better performance, but the cost is higher, which limits its application.
- The raw material of sodium silicate method is cheap and easy to obtain, and the product performance is also better, which has a more significant market value.
How mant types of MQ resins?
MQ silicone resin has many different types due to the different organic groups R on the sphere shell:
- When R is all methyl, it is called methyl MQ silicone resin or MQ silicone resin for short;
- When part of R is vinyl, it is called methyl vinyl MQ silicone resin;
- When part of R is H, it is called methyl hydrogen-containing MQ silicone resin;
- There are also methyl phenyl MQ silicone resin, vinyl MQ silicone resin, phenyl MQ silicone resin, fluorine MQ silicone resin, MDQ, MTQ silicone resin, and MQ silicone resin. silicone resin, MDQ, MTQ silicone resin, etc.
What are the advantages of silicone MQ resin?
Excellent heat resistance, low-temperature resistance
Can be used in -60℃ to +300℃ temperature environment.Good weather resistance, aging resistance, UV irradiation resistance
Excellent water repellency
Better adhesion performance
Excellent isolation performance
MQ resin in silicone PSA
Silicone PSA is a special adhesive composed of silicone resin (commonly used MQ silicone resin), silicone rubber, catalyst, cross-linking agent and other additives. Because the solvent type contains a large amount of volatile organic compounds, solvent volatilization is easy to cause serious pollution to the environment during curing. Nowadays, environmental protection has been paid more and more attention. The silicone pressure-sensitive adhesive industry is taking environmental protection and low-cost products as the development mainstream, and taking biodegradable, radiation curing and other new products as the research direction. Silicone MQ resin mainly plays the role of tackifying and reinforcing. The silicone hydroxyl group or vinyl group in MQ resin can condense with the hydroxyl group of silicone rubber or with silicone rubber through hydrogen-containing siloxane under the action of catalyst, so as to prepare silicone pressure-sensitive adhesive.
The indexes to measure the adhesive performance of pressure-sensitive adhesives are tack (T), adhesion (A), cohesion (C) and keying (K). In order to produce excellent pressure-sensitive adhesives, we must consider how to make the four adhesions meet the following equilibrium relationship: K > C > A > T.
Why use MQ silicone resin in silicone rubber?
Silicone rubber has a variety of excellent properties, but its mechanical properties such as compression strength and tear strength are poor and cannot meet the requirements of the process, so fillers need to be added to modify and strengthen it. MQ silicone resin as reinforcing filler can increase the strength of the rubber matrix, but does not make the system viscosity increase too fast and facilitate the subsequent operation, and the resulting vulcanization rubber transparency is better.
- The organic part of MQ silicone resin can improve its compatibility with silicone rubber and play the role of adhesion enhancement.
- Silicon oxygen chain can improve the mechanical strength, cohesive strength, peeling strength and high-temperature resistance of silicone rubber, and play a reinforcing role.
Condensed vulcanized silicone rubber
It’s mainly composed of silicone rubber containing terminal hydroxyl or alkoxy groups, reinforcing filler, cross-linking agent and catalyst.
After the catalyst or the action of moisture in the air, the cross-linking agent hydrolysis to generate silanol, so that the condensation reaction between the silicon hydroxyl group and the raw rubber to form a three-dimensional network structure, vulcanized into elastomer. deteriorate. The main reason for the reduction in quality and performance of silicone rubber due to irradiation is the escape of unreacted low molecular substances in the vulcanized rubber, the breakage of the macromolecular network structure, and the degradation or cross-linking of molecular chains. To make silicone rubber resistant to radiation, radiation-resistant fillers, such as nano-TiO2, can be added to it.
Addition vulcanized silicone rubber
It is mainly composed of raw rubber containing vinyl, reinforcing filler, silicone oil crosslinker containing hydrogen and platinum catalyst.
Under the action of platinum catalyst, MQ resin containing vinyl group can chemically combine with raw rubber through hydrosilylation reaction with SiH crosslinker to form three-dimensional network structure for reinforcement. With the increase of MQ silicone resin content, the hardness, tensile strength, tear strength, adhesive property and crosslinking density of silicone rubber gradually increase to the optimum value. The reason is that MQ silicone resin has relatively small molecular weight, relatively high vinyl content, good compatibility and dispersion in silicone rubber, and chemical combination with silicone rubber. However, when the cross-linking density is too large, the distribution of cross-linking points is uneven, forming stress concentration, and the silicone rubber becomes hard and brittle. Under the effect of stress, the silicone rubber is easy to crack. The curing time is prolonged with the increase of MQ dosage, because MQ molecule is small and vinyl content is high, which can preferentially react with hydrogen silicone oil, thus delaying the reaction of silicon hydrogen and vinyl rubber until MQ is consumed. With the increase of MQ resin content, the dielectric constant of silicone rubber increases to the maximum and approaches equilibrium. However, excessive amounts of MQ resin and excessive cross-linking of silicone rubber limit the activity of polar groups, thus making the dielectric constant tend to be stable. However, the dielectric property of silicone resin is still lower than that of ordinary rubber.
Prospects for silicone MQ resins
We Have Great Answers
Frequently Asked Questions
- The MOQ for regular products is one durm.
- For custom products, it depends on the situation, please contact us for your questions.
Of course, you can always contact us to get the materials and information you want. You can also download them through the specific product pages.
Regular stock products usually only need 7-15 days to stock, custom products are subject to availability, please contact us.
When stored at or below 25℃ in the original unopened containers, this product has usable life of 12 months from the date of production.
If more than the storage period, the product should be rechecked.
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