Method for eliminating bubbles in organic silicone resin cast body

A resin casting and silicone technology, applied in the field of silicone resin modification, can solve the problems of inability to completely eliminate silicone resin bubbles, and achieve the effects of smooth and smooth surface, excellent performance and simple defoaming method.

Inactive Publication Date: 2012-02-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the technical problem that existing methods cannot completely eliminate air bubbles in the silicone resin cast body; and provides a method for eliminating air bubbles in the silicone resin cast body

Method used

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  • Method for eliminating bubbles in organic silicone resin cast body
  • Method for eliminating bubbles in organic silicone resin cast body
  • Method for eliminating bubbles in organic silicone resin cast body

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0012] Embodiment 1: The method for eliminating air bubbles in the silicone resin cast body in this embodiment is achieved through the following steps:

[0013] Step 1, adding long-chain fatty amine to the silicone resin solution, wherein the mass ratio of the long-chain fatty amine to the silicone resin solution is 1:12-15, and the mass concentration of the silicone resin solution is 50%;

[0014] Step 2, stirring the silicone resin solution treated in Step 1 at 40-60°C while ultrasonically dispersing;

[0015] Step 3. Place the silicone resin solution treated in Step 1 in the air for 20h-30h (to evaporate the solvent); then place it in an oven and dry it at 60-80°C for 2-3h;

[0016] Step 4: Apply mold release agent on the mold, place it in the air for 10-15 minutes, pour the silicone resin treated in Step 3 into the mold, then put it in an oven, and cure it at 80-90°C for 1-2 hours , raise the temperature to 100-120°C, cure for 0.5-1h, then raise the temperature to 125-140...

specific Embodiment approach 2

[0017] Embodiment 2: This embodiment is different from Embodiment 1 in that: the silicone resin in the silicone resin solution in Step 1 is methylphenyl silicone resin or methyl silicone resin. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0018] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the solvent in the silicone resin solution in Step 1 is toluene. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

Relating to methods of organic silicone resin modification, the invention provides a method for eliminating bubbles in an organic silicone resin cast body. The invention aims to solve the technical problem that bubbles in an organic silicone resin cast body are unable to be eliminated completely by present methods. The method of the invention comprises the steps of: 1. adding long-chain fatty amine into an organic silicone resin solution; 2. conducting heating stirring and ultrasonic dispersion simultaneously; placing the solution in the air for drying; 4, coating a mould with a mould release agent, disposing the mould in the air, and pouring the organic silicone resin treated in step 3 into the mould, then putting the mould into a drying oven for curing, thus realizing elimination of bubbles in an organic silicone resin cast body. Characterized by simple defoaming method and low cost, the method provided in the invention is suitable for preparing organic silicone resin cast bodies without bubbles. Compared with organic silicone resin cast bodies not treated by the method of the invention, the organic silicone resin treated by the method provided in the invention has a smooth surface, the cast body contains no bubble and the performance is obviously improved.

Description

technical field [0001] The invention relates to a method for modifying a silicone resin. Background technique [0002] Silicone resin and its composite materials have good high temperature stability, dielectric properties, light weight, low thermal expansion coefficient, good waterproof performance, etc., and are the best choice for radar radomes. Silicone resin is a polyorganosiloxane with a highly cross-linked network structure. It has both an inorganic silicon-oxygen chain structure and an organic group in its composition. It is a typical semi-inorganic polymer. It not only has a series of characteristics of inorganic quartz, but also has the characteristics of easy processing of polymer materials, so it is widely used. However, when most silicone resins are cured, it is a condensation polymerization reaction that removes small molecules. In addition, when the silicone resin is cured, it contains a large amount of toluene solvent, and the gas phase is generated during cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/388
Inventor 姜波黄玉东白惠文刘丽白永平孟令辉胡春平费飞飞潘海涛
Owner HARBIN INST OF TECH
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