Preparation method of modified polysiloxane/polymethyl methacrylate composite material

A technology of polymethyl methacrylate and methyl methacrylate is applied in the field of composite materials, which can solve the problems that optical materials cannot achieve light transmittance and haze, and achieve the effect of avoiding uneven dispersion.

Active Publication Date: 2021-03-02
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional light-scattering materials use silicone rubber microspheres. Usually, it is necessary to prepare silicone rubber microspheres first, and then to solve the dispersion problem of silicone rubber microspheres in optical materials. Once the microspheres are not uniformly dispersed, all The prepared optical materials cannot achieve the required light transmittance and haze. Therefore, it is necessary to develop a new material with simple preparation process, no need to worry about dispersion, and high light transmittance and high haze at the same time.

Method used

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  • Preparation method of modified polysiloxane/polymethyl methacrylate composite material
  • Preparation method of modified polysiloxane/polymethyl methacrylate composite material
  • Preparation method of modified polysiloxane/polymethyl methacrylate composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Preparation of hydroxy-terminated polysiloxane: react 30mL octamethylcyclotetrasiloxane, 24mL toluene and 6g KOH at 120°C for 6h, the stirring speed during the reaction is 150r / min, and cool down to 60°C , with a mass fraction of 15% H 2 SO 4 Neutralize the reaction solution to a pH value of 7, stir for 2 hours, then separate the liquids, take the target liquid in the upper layer, and evaporate toluene to obtain hydroxyl-terminated polysiloxane;

[0033] (2) Preparation of modified polysiloxane: Mix 20 mL of hydroxyl-terminated polysiloxane prepared in step (1) with 20 mL of dichloromethane, add 0.2 g of anhydrous Na 2 CO 3 , placed in ice water, dropwise added a mixture of 10mL dichloromethane and 4mL methacryloyl chloride at a rate of 8 drops / min, after the dropwise addition was completed, warmed up to room temperature and continued to react for 2h, followed by 5% NaHCO 3 Solution, saturated saline and deionized water were washed twice, the liquid was separated...

Embodiment 2

[0036] (1) Preparation of hydroxyl-terminated polysiloxane: react 30mL octamethylcyclotetrasiloxane, 24mL toluene and 6g KOH at 135°C for 4h, the stirring speed during the reaction is 130r / min, and cool down to 60°C , with a mass fraction of 15% H 2 SO 4 Neutralize the reaction solution to a pH value of 7, stir for 3 hours, then separate the liquids, take the target liquid in the upper layer, and evaporate toluene to obtain hydroxyl-terminated polysiloxane;

[0037] (2) Preparation of modified polysiloxane: Mix 20 mL of hydroxyl-terminated polysiloxane prepared in step (1) with 20 mL of dichloromethane, add 0.2 g of anhydrous Na 2 CO 3 , placed in ice water, dropwise added a mixture of 10mL dichloromethane and 3mL acryloyl chloride at a rate of 10 drops / min, after the dropwise addition, warmed up to room temperature and continued to react for 1h, followed by 5% NaHCO 3 Solution, saturated saline and deionized water were washed twice, separated, the temperature of the target...

Embodiment 3

[0040] (1) Preparation of hydroxyl-terminated polysiloxane: react 30mL octamethylcyclotetrasiloxane, 24mL toluene and 6g KOH at 130°C for 5h, the stirring speed during the reaction is 120r / min, and cool down to 60°C , with a mass fraction of 15% H 2 SO 4 Neutralize the reaction solution to a pH value of 7, stir for 3 hours, then separate the liquids, take the target liquid in the upper layer, and evaporate toluene to obtain hydroxyl-terminated polysiloxane;

[0041] (2) Preparation of modified polysiloxane: Mix 20 mL of hydroxyl-terminated polysiloxane prepared in step (1) with 20 mL of dichloromethane, add 0.2 g of anhydrous Na 2 CO 3 , placed in ice water, dropwise added a mixture of 10mL dichloromethane and 3.5mL acryloyl chloride at a rate of 12 drops / min, after the dropwise addition was completed, warmed up to room temperature and continued to react for 2 hours, followed by 5% NaHCO 3 Solution, saturated saline and deionized water were washed twice, separated, the temp...

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Abstract

Belonging to the field of composite materials, the invention specifically relates to a preparation method of a modified polysiloxane / polymethyl methacrylate composite material. The method includes: (1) subjecting octamethyl cyclotetrasiloxane to ring-opening preparation of hydroxyl-terminated polysiloxane; (2) reacting the hydroxyl-terminated polysiloxane with acryloyl chloride or methacryloyl chloride to obtain modified polysiloxane; and (3) subjecting methyl methacrylate and modified polysiloxane prepared in step (2) to polymerization reaction to obtain the modified polysiloxane / polymethyl methacrylate composite material. According to the invention, liquid modified polysiloxane and methyl methacrylate are directly polymerized, the process for preparation of microspheres in the existing methods is eliminated, and the problem of uneven dispersion of microspheres is avoided. Modified polysiloxane can be evenly dispersed in methyl methacrylate, and light can be softer and more uniform after being scattered by the prepared composite material. And by adjusting the dosage of the modified polysiloxane, the haze of the prepared composite material can be adjusted controllably.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a preparation method of a modified polysiloxane / polymethyl methacrylate composite material. Background technique [0002] Due to its incomparable advantages, LED lighting and backlight material industries are developing rapidly, and light scattering materials are one of the important raw materials in these industries. Light scattering materials can convert point and line light sources into line and surface light sources. And it generally has high haze while taking into account high light transmittance, excellent mechanical properties, thermal stability and weather resistance, and is widely used in lighting sources, advertising signs, backlight materials for liquid crystal displays and other fields. The design of the material is strong, and the desired effect can be obtained by replacing the matrix material and the scatterer material. [0003] Traditional light-scat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/12C08F220/14C08G77/385
CPCC08F283/124C08G77/385C08F220/14
Inventor 姜彦蒋鲸喆季月羌慧钧黄依伊张洪文
Owner CHANGZHOU UNIV
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