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Preparation method of PVB resin with high bulk density

A technology of bulk density and resin, applied in the field of preparation of high bulk density PVB resin, can solve problems such as uneven dispersion of butyraldehyde, reduce post-processing costs, etc., and achieve the effects of increasing acetal degree, reducing production cost and reducing production difficulty

Inactive Publication Date: 2020-01-17
怀集县怀德新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above technical problems, the present invention provides a preparation method of high bulk density PVB resin, to solve the problem of avoiding the addition of emulsifiers in the reaction system, reducing post-processing costs, and preventing butyraldehyde from being unevenly dispersed in the reaction system And the problem of PVB agglomeration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1 A kind of preparation 1 of high bulk density PVB resin

[0018] Step 1. Preparation of mixed reaction solution: adjust the temperature of the system to 40-50°C, add n-butyraldehyde to the degraded polyvinyl alcohol aqueous solution, wherein the mass ratio of polyvinyl alcohol to n-butyraldehyde is 1:0.5;

[0019] The degraded polyvinyl alcohol aqueous solution is prepared by the following method: put polyvinyl alcohol and water with a mass ratio of 1:8 into the reactor, raise the temperature of the system to 70-80°C until the polyvinyl alcohol is dissolved, and then add H 2 o 2 into the reactor, H 2 o 2 The mass ratio of polyvinyl alcohol to polyvinyl alcohol is 1:15, and the stirring reaction degrades polyvinyl alcohol;

[0020] Step 2, acetalization reaction: adjust the reaction temperature to 10-15°C, add hydrochloric acid, the mass volume ratio of hydrochloric acid to polyvinyl alcohol is 100g:8ml, react for 0.5-1h, PVB resin is gradually precipitate...

Embodiment 2

[0023] Embodiment 2 A kind of preparation II of high bulk density PVB resin

[0024] Step 1. Preparation of mixed reaction solution: adjust the temperature of the system to 60-70°C, add n-butyraldehyde to the degraded polyvinyl alcohol aqueous solution, wherein the mass ratio of polyvinyl alcohol to n-butyraldehyde is 1:0.65;

[0025] The degraded polyvinyl alcohol aqueous solution is prepared by the following method: put polyvinyl alcohol and water with a mass ratio of 1:10 into the reactor, raise the temperature of the system to 70-80°C until the polyvinyl alcohol is dissolved, and then add H 2 o 2 into the reactor, H 2 o 2 The mass ratio of polyvinyl alcohol and polyvinyl alcohol is 1:20, and the stirring reaction degrades polyvinyl alcohol;

[0026] Step 2, acetalization reaction: adjust the reaction temperature to 10-15°C, add hydrochloric acid, the mass volume ratio of hydrochloric acid to polyvinyl alcohol is 100g:18ml, react for 0.5-1h, PVB resin is gradually precip...

Embodiment 3

[0029] Embodiment 3 A kind of preparation III of high bulk density PVB resin

[0030] Step 1. Preparation of mixed reaction solution: adjust the temperature of the system to 50-60°C, add n-butyraldehyde to the degraded polyvinyl alcohol aqueous solution, wherein the mass ratio of polyvinyl alcohol to n-butyraldehyde is 1:0.55;

[0031] The degraded polyvinyl alcohol aqueous solution is prepared by the following method: put polyvinyl alcohol and water with a mass ratio of 1:9 into the reactor, raise the temperature of the system to 70-80°C until the polyvinyl alcohol is dissolved, and then add H 2 o 2 into the reactor, H 2 o 2 The mass ratio of polyvinyl alcohol to polyvinyl alcohol is 1:18, and the stirring reaction degrades polyvinyl alcohol;

[0032] Step 2, acetalization reaction: adjust the reaction temperature to 10-15°C, add hydrochloric acid, the mass volume ratio of hydrochloric acid to polyvinyl alcohol is 100g:12ml, react for 0.5-1h, PVB resin is gradually precipi...

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PUM

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Abstract

The invention relates to the technical field of preparation of PVB resin, especially to a preparation method of PVB resin with high bulk density. In order to improve production efficiency and reduce production cost and production difficulty, PVA resin is degraded, the addition sequence of n-butyraldehyde is adjusted, and process conditions such as synthesis temperature are optimized, so an emulsifier is prevented from being added, the n-butyraldehyde is ensured to be uniformly dispersed in a system, and the acetalation degree of the PVB resin is improved; an acetalation reaction and a chain extension reaction are simultaneously carried out by adding a small amount of a chain extender, so the viscosity of the PVB resin is improved; and the PVB resin prepared by using the method has high acetalation degree and high viscosity.

Description

technical field [0001] The present invention relates to the preparation technical field of PVB resin, particularly a kind of preparation method of high bulk density PVB resin. Background technique [0002] Polyvinyl Butyral Resin (Polyvinyl Butyral Resin, PVB) is a resin synthesized by acetal reaction of polyvinyl alcohol (PVA) and butyraldehyde under acidic conditions. It has high transparency, cold resistance, impact resistance and ultraviolet radiation resistance. Good adhesion to metal, glass, wood, ceramics, fiber products, etc. The existing synthetic technique of polyvinyl butyral (being called for short PVB) resin is divided into two kinds of homogeneous phase method and heterogeneous phase method. The homogeneous method usually uses polyvinyl acetate as the starting material, and the alcoholysis and acetalization reactions are carried out simultaneously, and then the finished product is obtained through steps such as precipitation, washing, and drying. The heterog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/30C08F8/28C08F16/06
CPCC08F8/28C08F8/30C08F16/06
Inventor 叶卫民梁飞申坤娄金楼
Owner 怀集县怀德新材料有限公司
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