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Method for preparing silicon rubber adhesive cured at room temperature

A room temperature curing, silicone rubber technology, applied in adhesives, non-polymer adhesive additives, adhesive additives, etc., can solve the problems of entrained impurities, strong corrosion, pollution, etc., and achieve high production efficiency and short production cycle , the effect of convenient operation

Inactive Publication Date: 2013-04-10
陈俊光
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, many room temperature curing silicone rubbers on the market are mainly made of deacetic acid, deketoxime, and deamination. After a long process such as kneading and compounding, they are packaged. Certain pollution or corrosiveness lead to restrictions on use in many industries. At the same time, in order to ensure the shelf life, the amount of curing agent will be increased, which will lead to more low-molecular volatiles and greater odor of the product, which is harmful to the environment and substrates. increased negative impact of
[0004] Chinese patents 02810846.9, 02102356.5, and 00137031.6 all contain a large amount of Na in the material + , Ca 2+ , Cl - It cannot be removed, resulting in strong corrosiveness, high low molecular content, and strong odor, which limits its scope of use
[0005] U.S. Patent 7674871B2, because of its poor fluidity, complex production process, and many impurities in the raw materials, it is not suitable for use in the precision electronic and electrical industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The synthesis of embodiment 1, A

[0052] Add 15Kg of methyltrimethoxysilane and 100Kg of toluene to 100Kg of linear hydroxyl-terminated siloxane with a viscosity of 10000cps, add 1.5Kg of acetic acid at 60-65°C, stir for 4-5 hours, remove methanol and toluene under reduced pressure After that, the product can be obtained with a viscosity of about 12000-13500cps.

Embodiment 2、B1

[0053] Embodiment 2, B 1 Synthesis

[0054] Will contain SiO 2Measure 225Kg of 26-27% sodium silicate aqueous solution, dissolve it in water, and then add it to 450Kg of rapidly stirred 15%-18% by mass hydrochloric acid aqueous solution within 10 minutes. Then add 90Kg of isopropanol, 84Kg of trimethylchlorosilane, and 120Kg of xylene. After the addition, heat up and reflux for 2 hours. After cooling, add 250Kg of xylene for extraction. Stand still to separate the water layer and clean the organic layer. Isopropanol, water and part of xylene were distilled off from the solution to obtain the mixed solution product of MQ resin containing hydroxyl group and xylene with a solid content of 35%.

[0055] Add 550Kg of the above-mentioned hydroxyl-containing MQ resin with a viscosity (25°C) of 50pa.s into a planetary mixer, add 15Kg of methyltrimethoxysilane, stir and mix for 1h under a nitrogen atmosphere, and then add 4% (parts by mass) 1.7Kg methanol solution of NaOH, heated an...

Embodiment 3

[0056] Embodiment 3, B 2 Synthesis

[0057] In a pressure-resistant glass-lined vessel, add 114Kg of hexamethyldisiloxane and 59.2Kg of dimethyldiethoxysilane, equivalent to SiO 2 300Kg of 2mol polyethyl silicate and 5Kg of methanesulfonic acid were stirred and mixed. After heating to 68°C, slowly add 108Kg of pure water. After the addition is complete, the temperature is raised to 110°C. At this time, the internal pressure of the reactor is 2.8 atm, stirred for 3 hours, and cooled to room temperature. Add 250Kg of xylene to the reactant, neutralize with sodium phosphate, filter, distill off ethanol and water to obtain a xylene resin mixture with a solid content of about 35% and a hydroxyl content of 0.2-1.0%.

[0058] After the above product is concentrated, it is 5000mm 2 / s, add about 3% methyldimethoxysilane, stir at 60°C, then add 11ppm of platinum catalyst, react at 85°C for 4h, heat up, remove low molecular weight substances and volatiles at 110°C / 10mmHg A silane-ca...

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Abstract

The invention relates to a method for preparing a silicon rubber adhesive cured at room temperature. The silicon rubber adhesive is prepared by mixing and dispersing an anhydrous solvent and an anhydrous material in a humidity insulating container and evaporating the mixture to remove the solvent. A dealcoholized component silicon rubber adhesive which has various effects and is cured by moistureat room temperature is prepared by taking polysiloxane resin as a reinforcing material so as to obtain an applicable refined silicon rubber adhesive which can meet the requirements of electronic and micro-electronic industry production.

Description

Technical field: [0001] The invention relates to a method for manufacturing a single-component room-temperature-curing dealcoholized quick-drying refined silicone adhesive sealant, in particular to a method for preparing a room-temperature-cured silicone rubber adhesive. technical background: [0002] Room temperature vulcanized silicone rubber is a kind of neutral adhesive coating agent widely used in electronic appliances, microelectronics and optoelectronic industries. Especially dealcoholized one-component room temperature curing silicone rubber, the alcohol substances released during the curing process will not corrode various electronic and electrical devices and circuit boards, and are easy to volatilize, and the surface will dry and cure quickly during use, which is harmful to the environment. The influence is small, so it is widely used. In addition, heat dissipation protection and bonding of chip packaging, sensitive electronic components, high-power LED lamp resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/06C09J11/04
Inventor 陈俊光
Owner 陈俊光
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