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Dealcoholized one-component room temperature vulcanized silicone rubber and preparation method thereof

A room temperature vulcanization and dealcoholization technology, applied in the field of room temperature vulcanization silicone rubber, can solve the problems of affecting production efficiency, performance degradation, slow curing speed, etc., and achieve the effects of improving storage stability, accelerating curing speed, and fast curing speed

Active Publication Date: 2012-06-27
CHENGDU TALY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This formula has the following main disadvantages in production and application: In terms of production: after adding titanate chelate, the rubber has a viscosity peak, that is, there is a process of thickening the rubber, and it needs to be stirred for a period of time. In order to reduce the consistency, it will bring problems such as high resistance and high energy consumption, which will bring troubles to production control; in terms of application: 1. The surface dry time is long, and the internal curing speed is slow, which affects customer use; 2. Used as a sealant or adhesive 3. The storage performance of the product is not good, and the storage period does not exceed 3 months. After the storage time exceeds 3 months, the vulcanization speed at the initial stage of preparation and the vulcanization rate after vulcanization are different. Compared with the performance, there is a big difference, the use performance is reduced, and the vulcanization performance will be lost in severe cases
[0010] 2. Rapid curing at room temperature: As an assembly line production operation, in order to ensure work efficiency, this special silica gel needs to be able to dry the surface in less than 20 minutes at room temperature (25 ℃, 50%), and the non-stick time is less than 30 minutes. Minutes, if it cannot be cured quickly, it will lead to a lot of waste of time in the workflow and affect production efficiency
[0013] In the existing assembly of liquid crystal display modules, LCD / LCM COG, TAB, COF packaging and protection professional silicone rubber, using conventional dealcoholized one-component silicone rubber products that cure quickly at room temperature, there are several problems that are not easy to solve: 1. Thick fluidity: Due to the slow flow rate, the glue cannot be completely coated during the coating process of cable terminals, connectors, LCM modules, crystal oscillators, printed circuit boards and thick and thin mixed circuit boards ;2. The curing speed at room temperature is slow: the curing time of low viscosity dealcoholized products is generally 30 minutes (25 ℃, 50%)
[0014] In the assembly of liquid crystal display modules, LCD / LCM COG, TAB, COF packaging and protection industries, it is necessary to have a low viscosity, high flow, fast curing, environmental protection Products with no corrosion and other characteristics, but there is no development of such products in China

Method used

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  • Dealcoholized one-component room temperature vulcanized silicone rubber and preparation method thereof
  • Dealcoholized one-component room temperature vulcanized silicone rubber and preparation method thereof
  • Dealcoholized one-component room temperature vulcanized silicone rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 90 parts of α, ω-dihydroxypolydimethylsiloxane with a viscosity of 500mpa.s, 1 part of linear polydimethylsiloxane with a hydroxyl group and a viscosity of 5mpa.s, 5 parts of white carbon black, organic titanium 1 part of acid ester chelate, 4 parts of methyltrimethoxysilane; α, ω-dihydroxypolydimethylsiloxane, linear polydimethylsiloxane with hydroxyl terminal group and white carbon black Mix evenly in the kneader, then transfer to the three-roll machine for grinding, and then transfer to the kneader to heat up and stir to form rubber, then keep the temperature of the rubber at 100 ℃ and the vacuum degree of 0.085 Mpa, stir and vacuumize Dry for 2 hours, airtight for use;

[0038] Put the dried rubber into the planetary stirring tank, when the airtight temperature of the rubber is within 50 ℃, add organic titanate chelate and methyl trimethoxysilane, stir at high speed for 20 minutes, then vacuumize and stir for 10 minutes , and then the vacuum is eliminated to ...

Embodiment 2

[0040] Weigh 105 parts of 5000mpa.sα, ω-dihydroxypolydimethylsiloxane, 5 parts of 50mpa.s linear polydimethylsiloxane with hydroxyl end groups, 10 parts of white carbon black, organic titanate chelate 2 parts of compound, 7 parts of methyltrimethoxysilane;

[0041] Mix α,ω-dihydroxypolydimethylsiloxane, linear polydimethylsiloxane with hydroxyl end groups and white carbon black in a kneader, and then transfer to a three-roll machine for grinding. After uniformity, transfer to a kneader to heat up and stir to form a rubber material, then keep the temperature of the rubber material at 125°C and the vacuum degree of 0.095 Mpa, stir and vacuum dry for 3 hours, and seal it for use.

[0042] Put the dried rubber into the planetary stirring tank, when the airtight temperature of the rubber is within 75°C, add organic titanate chelate and methyl trimethoxysilane, stir at high speed for 30 minutes, then vacuumize and stir for 20 minutes , and then the vacuum is eliminated to obtain de...

Embodiment 3

[0044] Weigh 120 parts of 10000mpa.sα, ω-dihydroxypolydimethylsiloxane, 10 parts of 100mpa.s linear polydimethylsiloxane with hydroxyl end groups, 15 parts of white carbon black, organic titanate chelate 3 parts of compound, 10 parts of methyltrimethoxysilane;

[0045] Mix α,ω-dihydroxypolydimethylsiloxane, linear polydimethylsiloxane with hydroxyl end groups and white carbon black in a kneader, and then transfer to a three-roll machine for grinding. After uniformity, transfer to a kneader to heat up and stir to form a rubber compound, then keep the temperature of the rubber compound at 150 ° C and a vacuum degree of 0.105 Mpa, stir and vacuum-dry for 4 hours, and seal it for use.

[0046] Put the dried rubber material into the planetary stirring tank, when the sealing temperature of the rubber material is within 100 ℃, add organic titanate chelate and methyl trimethoxysilane, stir at high speed for 40 minutes, and then vacuumize and stir for 30 minutes , and then the vacuum ...

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Abstract

The invention belongs to the field of room temperature vulcanized silicone rubber and in particular relates to one-component room temperature vulcanized silicone rubber and a preparation method thereof. The one-component room temperature vulcanized silicone rubber is characterized by being prepared by taking alpha, omega-dihydroxypolydimethylsiloxane as base rubber, an organic titanate chelate asa catalyst and methyltrimethoxysilane as a crosslinking agent, and adding linear polydimethylsiloxane and a filler. According to the formula, the one-component room temperature vulcanized silicone rubber comprises 90 to 120 parts of alpha, omega-dihydroxypolydimethylsiloxane, 1 to 10 parts of linear polydimethylsiloxane with a hydroxyl group which is taken as a terminal group, 5 to 15 parts of white carbon black, 1 to 3 parts of organic titanate chelate and 4 to 10 parts of methyltrimethoxysilane. The preparation method comprises the following steps of: weighing raw materials, mixing rubber, drying, preparing and the like. The invention mainly aims at the requirements on the assembly of liquid crystal display modules, starts from the formula and a manufacturing process, can ensure that the flowability of a product is appropriate, and can also accelerate the curing speed of the product. The dealcoholized one-component room temperature vulcanized silicone rubber has the characteristics of low viscosity, no solvent, high flowability, fast curing and environment friendliness.

Description

technical field [0001] The invention belongs to the field of room temperature vulcanized silicone rubber, in particular to a single-component room temperature vulcanized silicone rubber and a preparation method thereof. Background technique [0002] One-component room temperature vulcanized silicone rubber has excellent electrical properties and chemical inertness, as well as heat resistance, natural aging resistance, flame resistance, moisture resistance, breathability and other properties. Heat, no heat release, small shrinkage after curing, good adhesion to materials, etc., mainly used for adhesives, sealants, insulation protection, etc. Other applications include in-situ forming gaskets, protective coatings and caulking material etc. [0003] Dealcoholized RTV-1 silicone rubber has excellent performance. Because it releases alcohol during the vulcanization process, it is neutral, odorless, non-corrosive to the substrate, and has a wide bonding surface. It is especially ...

Claims

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Application Information

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IPC IPC(8): C08L83/06C08K5/5419C08K3/36C08J3/24
Inventor 陶云峰张先银徐燕芬何枫方辉陈群跃
Owner CHENGDU TALY TECH CO LTD
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