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Functional additive for liquid silicone rubber as well as preparation method and application thereof

A technology of liquid silicone rubber and functional additives, applied in the direction of coating, etc., can solve the problems of multiple applications, complex principles and processes, and low yield

Pending Publication Date: 2021-02-12
CHEMCHINA ZHUZHOU RUBBER RES & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The improved method is mainly to introduce functional groups into the base compound or cross-linker molecules, and then carry out formula design, but there are many problems in this method. First, the introduction of functional groups into the base compound or cross-linker molecules is generally The principle and process are relatively complicated, the yield is not high, the purification is cumbersome, and most of them have obvious environmental protection problems, which greatly limit the promotion of their industrialization; second, the modification process is basically a single-function modification, which can only be unilaterally Improve a performance of silicone rubber, or a class of performance
Therefore, most of the liquid silicone rubbers currently on the market have conventional liquid silicone rubbers with low cost and many applications but relatively poor performance. Silicone rubbers with relatively good performance have high costs and are only used in special application fields. In general, Greatly limit the use of liquid silicone rubber

Method used

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  • Functional additive for liquid silicone rubber as well as preparation method and application thereof
  • Functional additive for liquid silicone rubber as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]A functional additive for liquid silicone rubber, which is mainly prepared from acrylic monomers, vinyl siloxanes, and other vinyl monomer compounds through a suitable polymerization method. The specific preparation method is as follows:

[0031](1) 200g vinyl silicone oil (vinyl siloxane, viscosity 500mpa.s, vinyl mass content 0.43%), 0.2g n-dodecyl mercaptan (chain transfer agent), 20.8g perfluoroalkyl ethyl Acrylate (acrylate monomer), 116g of hydroxyethyl acrylate (acrylate monomer), and 100g of acetone (solvent) were placed in a four-necked flask, mixed well, heated to 80°C, and dripped while stirring Mixed solution, the mixed solution is made up of 10g AIBN (azobisisobutyronitrile, chain initiator), 80g acetone (solvent), 106g acrylonitrile (other vinyl monomer compounds) mixed evenly, and the dropping rate is controlled. The dripping is completed within 90 minutes, keep the temperature at 80°C, react for 6 hours to obtain a preliminary sample, and then select a methyl ethy...

Embodiment 2

[0036]A functional additive for liquid silicone rubber, which is mainly prepared from acrylic monomers, vinyl siloxanes, and other vinyl monomer compounds through a suitable polymerization method. The specific preparation method is as follows:

[0037](1) Combine 200g vinyl silicone oil (vinyl siloxane, viscosity 200mpa.s, vinyl mass content 0.70%) with 0.2g 3-mercaptopropionic acid isooctyl ester (chain transfer agent), 20.8g perfluoroalkyl Ethyl acrylate (acrylate monomer), 65g of hydroxyethyl methacrylate (acrylate monomer), and 100g of acetone (solvent) were placed in a four-necked flask, mixed well, heated to 80°C, and stirred At the same time, drip into the mixed solution, the mixed solution is made of 8g AIBN (azobisisobutyronitrile, chain initiator), 80g acetone (solvent), 53g acrylonitrile (other vinyl monomer compounds) mixed evenly, and the dropping speed is controlled. Rate, dropwise addition is completed within 90min, keep the temperature at 80℃, react for 8h, get the prel...

Embodiment 3

[0042]A functional additive for liquid silicone rubber, which is mainly prepared from acrylic monomers, vinyl siloxanes, and other vinyl monomer compounds through a suitable polymerization method. The specific preparation method is as follows:

[0043](1) 200g vinyl silicone oil (vinyl siloxane, viscosity 200mpa.s, vinyl mass content 0.70%) and 0.2g tetrakis (3-mercaptopropionic acid) quaternary tetraol ester (chain transfer agent), 130g Put hydroxyethyl methacrylate (acrylate monomer), 72g acrylic acid (acrylate monomer), and 100g acetone (solvent) in a four-necked flask, mix well, raise the temperature to 80°C, and drop in while stirring Mixed solution, the mixed solution consists of 8g AIBN (azobisisobutyronitrile, chain initiator), 80g acetone (solvent), 106g acrylonitrile (other vinyl monomer compounds) mixed evenly, and the dropping rate is controlled. The dripping is completed within 90min, keep the temperature at 80℃, react for 8h to obtain a preliminary sample, and then select...

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Abstract

The invention discloses a functional additive for liquid silicone rubber. The functional additive is mainly prepared by polymerizing acrylate monomers, vinyl siloxane and other vinyl monomer compoundsaccording to the mass ratio of 80-300: 100-200: 20-120. The functional additive smoothly realizes the purpose of simultaneously modifying the liquid silicone rubber for several times, so that the performance of the organic silicon material is further improved. The preparation method comprises the following steps: mixing vinyl siloxane, an acrylate monomer, a chain transfer agent and a solvent, dropwise adding a chain initiator, other vinyl monomer compounds and a solvent, controlling the temperature to be 40 DEG C and 120 DEG C, making reacting for 2-8 hours to obtain a primary sample, performing extracting, performing distilling under reduced pressure, and removing the solvent, thereby obtaining the functional additive. The method is simple to operate, can smoothly implement industrial application, and can easily and effectively control the molecular structure, polymerization degree and the like of the functional additive.

Description

Technical field[0001]The invention belongs to the technical field of liquid silicone rubber, and in particular relates to a functional auxiliary agent for liquid silicone rubber and a preparation method and application thereof.Background technique[0002]Liquid silicone rubber is a self-leveling or thixotropic base material formulated with a medium degree of polymerization linear polyorganosiloxane as the base polymer, with fillers, various additives and additives, and can be extruded according to the variety and purpose of use. After extrusion, injection molding, and coating, it is vulcanized in the atmosphere or under heating to form an elastomer. Because the main chain Si-O bond energy is large, it gives the material excellent flexibility, good temperature resistance, Weather resistance and anti-aging performance, and is widely used in various fields such as medical, construction, power electronics, rail transit industries, such as moisture-proof, insulating coating and potting mat...

Claims

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Application Information

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IPC IPC(8): C08F283/12C08F220/24C08F220/20C08F220/44C08F2/06C08F2/38C08F220/06C09D183/04C09D7/65
CPCC08F283/124C09D183/04C09D7/65C08F220/24C08F220/20C08F220/44C08F2/06C08F2/38C08F220/06C08L51/085
Inventor 黎超华刘家甫陈棉刘毅霖
Owner CHEMCHINA ZHUZHOU RUBBER RES & DESIGN INST
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