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High-performance single-component dealcoholization room temperature vulcanized silicone rubber sealant and preparation method thereof

A room temperature vulcanization, one-component technology, used in non-polymer adhesive additives, adhesives, adhesive additives, etc., can solve the problem of poor wettability of polysiloxane, affecting the high temperature resistance of materials, and surface hydrophilicity difficult problem

Active Publication Date: 2016-08-10
勃乐氏密封系统(太仓)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the tensile strength, modulus, wear resistance and shear damage resistance of this type of silicone rubber are far from meeting the needs of the use conditions, their industrial use value is greatly limited.
[0003] In the patent application of CN200910069215.8 application number, a high temperature resistant rapid curing dealcoholization type room temperature vulcanized silicone rubber adhesive is introduced, and its performance is enhanced by using fumed titanium dioxide as an auxiliary agent. A large number of hydroxyl groups make it poorly wettable with polysiloxane, and at the same time too many hydroxyl groups will affect the high temperature resistance of the material
In the patent application with application number CN201410664829.1, an environmentally friendly adhesive sealant for LED lamps is introduced, which uses calcium carbonate and titanium dioxide as a single or mixed reinforcing agent to enhance its performance. However, since calcium carbonate is the same as silicon dioxide, Its surface hydrophilicity is difficult to be compatible with raw materials

Method used

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  • High-performance single-component dealcoholization room temperature vulcanized silicone rubber sealant and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The high-performance one-component dealcoholized room temperature vulcanized silicone rubber sealant of this embodiment is prepared from the following raw materials in parts by weight: 200 parts of α, ω-dihydroxypolydimethylsiloxane with a dynamic viscosity of 5000 cps , 15 parts of crosslinking agent, 200 parts of functional filler, 4 parts of catalyst and 20 parts of plasticizer;

[0031] Wherein, the preparation method of described functional filler is:

[0032] (1) Mix nano-calcium carbonate and deionized water to form an aqueous suspension with a mass fraction of 6%, then add polyvinylpyrrolidone accounting for 0.5% of divinylbenzene mass, stir and disperse for 80min at 1500r / min, and disperse The pH of the homogeneous suspension was adjusted to 6.5;

[0033] (2) Stir and heat the suspension under the condition of 450r / min and heat up to 78°C, then stabilize it for 12 minutes, then add ammonium persulfate accounting for 0.8% of the mass of divinylbenzene;

[0034...

Embodiment 2

[0039] The high-performance one-component dealcoholized room temperature vulcanized silicone rubber sealant of this embodiment is prepared from the following raw materials in parts by weight: 150 parts of α, ω-dihydroxypolydimethylsiloxane with a dynamic viscosity of 20000 cps , 5 parts of crosslinking agent, 150 parts of functional filler, 2 parts of catalyst and 0 parts of plasticizer;

[0040] Wherein, the preparation method of described functional filler is:

[0041] (1) Mix nano-calcium carbonate and deionized water to form an aqueous suspension with a mass fraction of 6%, add polyvinylpyrrolidone accounting for 1% of divinylbenzene mass, stir and disperse for 60min under the condition of 1800r / min, and disperse The pH of the homogeneous suspension was adjusted to 7.0;

[0042] (2) Stir and heat the suspension under the condition of 600r / min and heat up to 80°C, then stabilize it for 10min, then add ammonium persulfate accounting for 1.0% of the mass of divinylbenzene; ...

Embodiment 3

[0048] The high-performance one-component dealcoholized room temperature vulcanized silicone rubber sealant of this embodiment is prepared from the following raw materials in parts by weight: 180 parts of α, ω-dihydroxypolydimethylsiloxane with a dynamic viscosity of 50000 cps , 40 parts of crosslinking agent, 180 parts of functional filler, 10 parts of catalyst and 0 parts of plasticizer;

[0049] Wherein, the preparation method of described functional filler is:

[0050] (1) Mix nano-calcium carbonate and deionized water to form an aqueous suspension with a mass fraction of 10%, add polyvinylpyrrolidone accounting for 1% of the mass of divinylbenzene, stir and disperse for 40min under the condition of 2000r / min, and disperse The pH of the homogeneous suspension was adjusted to 6.5;

[0051] (2) Stir and heat the suspension under the condition of 750r / min and heat up to 82°C, stabilize it for 8 minutes, and then add ammonium persulfate accounting for 0.8% of the mass of diviny...

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Abstract

The invention relates to the technical field of sealing materials, in particular to a preparation method of a high-performance single-component dealcoholization room temperature vulcanized silicone rubber sealant .The sealant is prepared from, by weight, 150-200 parts of alpha, omega-dyhydroxyl polydimethylsiloxane, 5-40 parts of a crosslinking agent, 80-300 parts of functional filler, 2-10 parts of a catalyst and 0-20 parts of a plasticizer .The functional filler is composite particles prepared by adopting nano calcium carbonate as the nucleus and adopting polydivinylbenzene as a shell through a dispersion polymerization method, wherein the particle size is 50-90 nm; the functional filler shell is polydivinylbenzene, has the good hydrophobicity and can be wound around chain segments of a matrix or embedded in the matrix in an anchored mode, the composite particles on a micelle interface has the fiber-bridge effect on the matrix, and the effect of increasing the capacity of the single-component dealcoholization room temperature vulcanized silicone rubber sealant is achieved .The rubber sealant is good in adhesiveness, and the surface drying time is shorter than 10 min; due to the fact that the price of the filler is low, the comprehensive material cost can be lowered .

Description

technical field [0001] The invention relates to the technical field of sealing materials, in particular to a preparation method of a high-performance single-component dealcoholized room temperature vulcanized silicone rubber sealant. Background technique [0002] One-component room temperature vulcanizing silicone rubber is a moisture-curing one-component silicone adhesive, which is based on hydroxyl-terminated polydimethylsiloxane, trifunctional silane as crosslinking agent, and supplemented by fillers. , a mixture of plasticizers and catalysts. Due to its excellent aging resistance, high insulation, temperature resistance and medium resistance, silicone rubber is widely used in the bonding and sealing of aerospace, construction, automobile, electronic appliances and other fields. Dealcoholized room temperature vulcanized silicone rubber is a kind of one-component room temperature vulcanized silicone rubber. Compared with other types of room temperature silicone rubber, it...

Claims

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Application Information

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IPC IPC(8): C09J183/06C09J11/04
CPCC08K2201/011C08L2205/025C08L2205/03C08L2205/035C09J11/04C09J183/06C08L83/04C08L91/06C08K9/08C08K2003/265
Inventor 魏亮
Owner 勃乐氏密封系统(太仓)有限公司
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