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Preparation method of addition-type liquid silicon rubber tackifier

A technology of liquid silicone rubber and tackifier, applied in the direction of adhesives, adhesive additives, polymer adhesive additives, etc., can solve the problems of decreased cohesive force, low molecular weight of coupling agent, and general compatibility, etc., to achieve Increase the bonding effect and reduce the effect of gel formation

Inactive Publication Date: 2017-09-12
江苏纳恩新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively low molecular weight of the coupling agent, the compatibility with the addition-type liquid silicone rubber is average, and it is easy to cause a decrease in adhesion under harsh conditions such as long-term high temperature and ultraviolet aging.

Method used

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  • Preparation method of addition-type liquid silicon rubber tackifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 1000g of dimethyldimethoxysilane into the reaction kettle with mechanical stirring, reflux condenser and thermometer, slowly add 200g of 5% hydrochloric acid aqueous solution dropwise under stirring, and raise the temperature to 60°C for reaction after the dropwise addition is completed 5h, after vacuuming to remove moisture and small molecules, add 1.5g of tetra-n-butyl titanate and 300g of γ-glycidyl etheroxypropyltrimethoxysilane, heat up to 80°C for 5h, vacuumize and heat up to 160°C to remove Low boiling matter, a light yellow transparent liquid product was obtained.

Embodiment 2

[0018] Add 800g of dimethyldimethoxysilane and 200g of diphenyldimethoxysilane into the reaction kettle with mechanical stirring, reflux condenser and thermometer, and slowly add 200g of 5% hydrochloric acid aqueous solution dropwise under stirring After the dropwise addition is completed, the temperature is raised to 60°C for 5 hours, and after vacuuming to remove moisture and small molecules, add 1.5g of tetra-n-butyl titanate, 50G of vinyltrimethoxysilane and 250g of γ-glycidyl etheroxypropyl trimethoxy For silane, heat up to 80°C for 5 hours, vacuumize and heat up to 160°C to remove low boilers, and obtain a light yellow transparent liquid product.

Embodiment 3

[0020] Add 1000g of dimethyldimethoxysilane into the reaction kettle with mechanical stirring, reflux condenser and thermometer, slowly add 200g of 5% hydrochloric acid aqueous solution dropwise under stirring, and raise the temperature to 60°C for reaction after the dropwise addition is completed 5h, after vacuuming to remove moisture and small molecules, add 1.5g of organotin complex, 150g of γ-glycidyloxypropyltrimethoxysilane and 150g of γ-methacryloxypropyltrimethoxysilane, and heat up to React at 80°C for 5h, vacuumize and heat up to 160°C to remove low boilers to obtain a light yellow transparent liquid product.

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Abstract

The invention discloses a preparation method of an addition-type liquid silicon rubber tackifier and belongs to the technical field of chemical synthesis. The preparation method includes following steps: adding two-functional-group alkoxy silane into a reaction kettle; well mixing an acidic catalyst with water, and stirring while dropwise adding a mixture of the acidic catalyst and the water into the reaction kettle at normal temperature; heating to 50-80 DEG C for reaction for 1-5h; vacuumizing to remove low-boiling-point substance to obtain a colorless to buff product. The silicon rubber tackifier is prepared through two-step reaction of hydrolytic condensation and graft polymerization, so that molecular structure of the tackifier can be better controlled, and gel generation is reduced. In addition, an organic metal complex is introduced to serve as the catalyst and can play a role in tackifying in the subsequent process of silicon rubber curing, so that bonding effect of the tackifier is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and relates to a method for preparing a hydroxyl silicone oil oligomer by hydrolyzing and condensing a difunctional alkoxysilane, and then reacting with a trifunctional alkoxysilane under the catalysis of an organometallic complex to prepare a tackifier . Background technique [0002] Addition-type liquid silicone rubber has excellent temperature resistance, aging resistance, and yellowing resistance. It has gradually replaced epoxy resin in the field of electronic packaging, especially in the high-power LED packaging industry. The molecular chain of silicone polymer material itself is non-polar, and its bonding performance with other materials is poor. Generally, it is necessary to use a tackifier to achieve good bonding with the substrate. [0003] Coupling agent is a commonly used type of tackifier. By adding an appropriate type of coupling agent, the bonding performance between th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/44C08G77/16C09J183/07C09J183/05C09J11/08
CPCC08G77/16C08G77/44C08G77/80C08L2205/02C08L2205/025C08L2205/03C09J11/08C09J183/04C08L83/04C08L83/10
Inventor 陈义旺徐镇田秦俊远
Owner 江苏纳恩新材料有限公司
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