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Tackifier, preparation method thereof and silicone rubber composition

A tackifier and mixture technology, applied in adhesives, polymer adhesive additives, adhesive additives, etc., can solve problems such as difficult release of silica gel, no industrial application value, silica gel sticking to metal molds, etc.

Active Publication Date: 2020-04-14
东莞市贝特利新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, tackifiers in the prior art can improve the bond between silicone rubber and conventional thermoplastic resins such as plastics such as acrylonitrile-butadiene-styrene (ABS) resin, polycarbonate (PC) resin, polyethylene (PE) resin , Polypropylene (PP) resin, etc.; most patents report tackifiers that solve the bonding performance between silicone rubbers, but most silicone rubbers and plastics are made by molding or injection of metal molds. Adding a tackifier is very easy to make the silicone stick to the metal mold or make it difficult to release the silicone, which makes this self-adhesive silicone not worth industrial application

Method used

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  • Tackifier, preparation method thereof and silicone rubber composition
  • Tackifier, preparation method thereof and silicone rubber composition
  • Tackifier, preparation method thereof and silicone rubber composition

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preparation example Construction

[0039] The present invention provides a kind of preparation method of tackifier described in above-mentioned technical scheme, comprises the following steps:

[0040] a) mixing a compound having a structure of formula II with toluene and a platinum catalyst to obtain a first mixture;

[0041] Mixing heptamethyltrisiloxane having a structure of formula III and toluene to obtain a second mixture;

[0042] 2≤n≤20;

[0043]

[0044] b) Adding the second mixture dropwise to the first mixture at 30-80°C for reaction to obtain an intermediate product having a structure of formula IV;

[0045]

[0046] c) The intermediate product having the structure of formula IV is mixed with a siloxane compound and an acidic substance, reacted at 30-70°C, and neutralized to obtain a tackifier; the siloxane compound is selected from tetramethylcyclotetrasilicon Oxane and / or Methylphenylcyclotetrasiloxane.

[0047] The method provided by the invention has mild conditions, is simple, has st...

Embodiment 1

[0072] A) Charge (110 g) toluene and the following compound into a 2000 mL four-necked flask equipped with a reflux condenser, a thermometer, a dropping funnel and a mechanical stirrer: (0.5 mol) 1,6-hexanediol diacrylic acid ester

[0073]

[0074] And the Castel Karstedt catalyst that accounts for 15ppm in the whole reaction system;

[0075] B) Heating to 70°C and adding dropwise within 3 hours. After the dropwise addition of (1mol) heptamethyltrisiloxane and (110g) toluene is completed, react at a constant temperature of 80°C for 3 hours to obtain an intermediate reaction product.

[0076]

[0077] Stir and cool the reaction product to 50°C, (0.3mol) 1,3,5,7-tetramethylcyclotetrasiloxane, (1g) 98% concentrated sulfuric acid, stir for 8h, cool to room temperature, add (5g) bicarbonate Sodium neutralization for 2 hours, filtration, 110°C, -0.95Mpa, removal of low molecular weight, to obtain the tackifier A with the structure of formula 101;

[0078]

[0079] figur...

Embodiment 2

[0083] A) Charge (110 g) toluene and the following compound into a 2000 mL four-necked flask equipped with a reflux condenser, a thermometer, a dropping funnel and a mechanical stirrer: (0.5 mol) 1,9-hexanediol diacrylic acid ester

[0084]

[0085] And account for the Speier catalyst of 15ppm in the whole reaction system;

[0086] B) Heating to 70°C and adding dropwise within 3 hours. After the dropwise addition of (1mol) heptamethyltrisiloxane and (110g) toluene is completed, react at a constant temperature of 80°C for 3 hours to obtain an intermediate reaction product.

[0087]

[0088] Stir and cool the reaction product to 50°C, (0.3mol) 1,3,5,7-tetramethylcyclotetrasiloxane, (1g) 98% concentrated sulfuric acid and stir for 8h, cool to room temperature, add (5g) bicarbonate Sodium neutralization for 2 hours, filtration, 110°C, -0.95MPa, removal of low molecular weight, to obtain tackifier B with the structure of formula 102;

[0089]

[0090] According to the me...

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Abstract

The invention provides a tackifier. The tackifier has a structure shown as a formula I, the tackifier can obviously improve the bonding effect between silicone rubber and a resin base material difficult to adhere, enables the silicone rubber to be fully bonded with the resin base material difficult to adhere, has good metal stripping performance and has good industrial application prospects. The limitation that a common tackifier can only improve the cohesiveness of a conventional general thermoplastic resin base material but cannot bond a resin base material which is difficult to bond is broken through, and other properties of the silicone rubber are not influenced. Experimental results show that cohesive failure of the silicon rubber to stainless steel and aluminum sheets is 0%; and thecohesive failure to glass fibers PA, PEI, PPSU and PC is greater than 90%.

Description

technical field [0001] The invention belongs to the technical field of bonding materials, and in particular relates to a tackifier, a preparation method thereof and a silicone rubber composition. Background technique [0002] Silicone rubber has been widely used in various fields due to its excellent properties such as high and low temperature resistance, weather aging resistance, ozone resistance, electrical insulation, flame resistance, non-toxicity, non-corrosion and physiological inertness, such as breathing masks for medical and diving equipment Sealing rings for various electrical appliances (such as ovens and microwave ovens), automotive parts such as high-voltage sheaths for spark plugs and seals for other connectors. In these many applications, silicone rubber is usually bonded to metal substrates or resin substrates for sealing or protection. However, as far as ordinary silicone rubber is concerned, its adhesion to substrates is often poor. Peels easily from subst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J11/08C09J183/04C08G77/12C08G77/08C08G77/06
CPCC08G77/06C08G77/08C08G77/12C08L2205/025C09J11/08C09J183/04C08L83/04
Inventor 叶文波张虎梁杰旭刘伟峰肖贵斌汤胜山殷永彪
Owner 东莞市贝特利新材料有限公司
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