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Method for preparing polyvinyl butyral (PVB) resin

A technology of polyvinyl butyral resin and polyhydroxy fat, which is applied in the field of blending and compounding enhanced catalysts to prepare polyvinyl butyral resin, which can solve the problems of high cost, large amount of water consumption, color and other physical properties There are problems such as changes, to achieve the effect of improved physical properties, high utilization of butyraldehyde, and smooth reaction

Inactive Publication Date: 2012-10-03
ZHEJIANG PULIJIN PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the traditional synthesis of polyvinyl butyral in various processes. The most important problem is how to control its agglomeration due to self-bonding, which affects the post-treatment process. At present, all major manufacturers control PVB bonding by adding surfactants such as emulsifiers, but this brings another The problem, that the removal of the emulsifier is difficult, requires a lot of water, and is expensive
At the same time, if the emulsifier is not completely removed, the adhesion between the PVB film interlayer and the glass surface will be greatly reduced, and the transparency of the laminated safety glass will be reduced, and the color and other physical properties will also change.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve 1000Kg of PVA and 350Kg of n-butyraldehyde in 6800Kg of pure water, then add 3Kg of a blended compound enhanced catalyst and mix evenly to obtain an aqueous mixture with a pH of about 1-3. The blending and compounding-enhanced catalyst is a viscous transparent colloid body prepared by in-situ blending and compounding polyhydroxyaliphatic organic acids, polyaromatic phosphates, etc., with inorganic acids and their salts. Keep the above aqueous mixture in a container at 65°C-70°C, stir for 60 minutes, add an appropriate amount of sodium hydroxide solution until the pH of the mixture is adjusted to about 10-12, add a commonly used surface tension modifier to reduce foam , a powdery suspension was obtained. Then, wash with pure water and cool to obtain white PVB resin powder with a degree of acetalization of about 82% and a hydroxyl value of about 17%.

Embodiment 2

[0023] Dissolving 1000Kg of PVA and 400Kg of n-butyraldehyde in 7000Kg of pure water, and then adding 50Kg of a blended compound enhanced catalyst and mixing evenly to obtain an aqueous mixture with a pH of about 1-3. in. The blending and compounding-enhanced catalyst is a viscous transparent colloid body prepared by in-situ blending and compounding polyhydroxyaliphatic organic acids, polyaromatic phosphates, etc., with inorganic acids and their salts. Keep the above aqueous mixture in a container at 75°C-80°C, stir for 50 minutes, add an appropriate amount of sodium hydroxide solution until the pH of the mixture is adjusted to about 10-12, add a commonly used surface tension modifier to reduce foam, A powdery suspension was obtained. Then, wash with pure water and cool to obtain white PVB resin powder with a degree of acetalization of about 80% and a hydroxyl value of about 19%.

Embodiment 3

[0025] Dissolve 1000Kg of PVA and 330Kg of n-butyraldehyde in 6600Kg of pure water, then add 40Kg of a blended compound enhanced catalyst and mix evenly to obtain an aqueous mixture with a pH of about 1-3. Among them, the blending and compounding enhanced catalyst is a viscous transparent colloid body prepared by blending and compounding polyhydroxyaliphatic organic acids, polyaromatic phosphates, etc., with inorganic acids and their salts. Keep the above water-based mixture in a container at 80°C-85°C, stir for 40 minutes, add an appropriate amount of sodium hydroxide solution until the pH of the mixture is adjusted to about 10-12, add a commonly used surface tension modifier to reduce foam , a powdery suspension was obtained. Then, wash with pure water and cool to obtain white PVB resin powder with a degree of acetalization of about 78% and a hydroxyl value of about 20%.

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Abstract

The invention provides a method for preparing polyvinyl butyral (PVB) resin. The method comprises the following steps of: dissolving 100 parts of polyvinyl alcohol (PVA) and 33 to 45 parts of n-butanal in 500 to 700 parts of pure water to form a mixed solution; adding 1 to 5 parts of blended composite reinforced catalyst into the mixed solution and mixing uniformly to obtain water-based mixture of which pH is 1 to 3; pouring the water-based mixture into a container at the temperature of between 4 and 100 DEG C, stirring for 30 to 300 minutes, adding a sodium hydroxide solution until the pH of the mixed solution is adjusted to be 10 to 12, and adding surface tension modifier to obtain slurry-shaped suspension; and washing the slurry-shaped suspension by using pure water, and cooling to obtain flowing powdery PVB resin micro particles of which the acetalization degree is 75 to 85 percent, and hydroxyl value is about 15 to 25. The method is easy to operate and is low in energy consumption; adhesion is avoided; and the utilization rate of raw materials is high.

Description

technical field [0001] The invention relates to a preparation method of polyvinyl butyral resin, in particular to a method for preparing and synthesizing polyvinyl butyral (PVB) resin by blending and compounding enhanced catalysts. Background technique [0002] Plasticized polyvinyl butyral (PVB) intermediate film has high transparency, good light resistance, cold resistance, water resistance and impact resistance, non-toxic, odorless and non-corrosive, and it is non-toxic to glass , metal, wood, ceramics, leather, fiber and other materials have good bonding performance. PVB resin and diaphragms have been widely used in architectural safety glass, automotive safety glass, solar photovoltaic module packaging film, coatings, primers, inks and other fields. PVB intermediate diaphragms produced with special formulas can also be used in aerospace, military and In the field of high-tech industry, PVB is currently recognized as the best bonding material for manufacturing laminated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F16/06C08F8/28C03C27/12B60J1/02H01L31/048C09J129/14C09D129/14C09D11/10C09D11/106
CPCY02E10/50
Inventor 胡巧玲张家桢
Owner ZHEJIANG PULIJIN PLASTIC
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