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A kind of preparation method of polyvinyl acetal resin

A technology of polyvinyl acetal resin and polyvinyl alcohol, which is applied in the field of preparation of organic polymer compounds, can solve problems such as insufficient contact, poor uniformity of acetalization, and difficult washing, so as to achieve good uniformity and reduce the number of washings and water consumption, avoiding the effect of washing difficulty

Active Publication Date: 2015-09-02
SICHUAN DONGFANG INSULATING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is intended to overcome the deficiencies in the above-mentioned prior art, for the traditional heterogeneous phase method of synthesizing polyvinyl acetal resin for starting point at PVA, the inside of the resin particle is not fully contacted with the reaction material, and the homogeneity of acetalization is poor; PVA To solve the problem of difficult washing caused by adding emulsifiers in the traditional heterogeneous method of synthesizing polyvinyl acetal resin, a preparation method of polyvinyl acetal resin is provided; thereby providing a polyvinyl acetal resin with high uniformity of acetalization Vinyl acetal resin synthesis method, the synthetic basic raw material of this method polyvinyl acetal resin is polyvinyl alcohol, aldehyde, catalyst, organic solvent and antioxidant

Method used

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  • A kind of preparation method of polyvinyl acetal resin
  • A kind of preparation method of polyvinyl acetal resin
  • A kind of preparation method of polyvinyl acetal resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、2

[0031] The synthesis process and post-treatment process of Examples 1 and 2 are the same.

[0032] (1) Synthesis process: The ingredients list of Examples 1 and 2 are:

[0033]

[0034] Add polyvinyl alcohol and water into reactor A, stir and heat to a dissolving temperature of 80°C to form a polyvinyl alcohol solution, cool to 10°C, add formula amount of aldehyde and catalyst to reactor A at the same time, and then add the Oxygen agent, carry out acetalization reaction, keep the temperature in the range of 10~13℃ during the reaction process, when the product precipitates out as powder or floc, continue the reaction for 1 hour, and then add the formula amount of ethanol to reactor A, Keep the temperature at 30°C, continue the reaction for 10 hours to end, and keep the material in reactor A at 30°C for standby use, that is, a mixture material containing the product—polyvinyl acetal resin is obtained in reactor A.

[0035] (2) Post-processing process:

[0036] Add 1400kg of pH=8 disper...

Embodiment 3～7

[0047] The basic process of synthesis and post-treatment of Examples 3-7 is the same.

[0048] (1) Synthesis process: The ingredients list of Examples 3-7 (the dosage unit is kg):

[0049] Add polyvinyl alcohol and water into reactor A, stir and heat to a dissolution temperature of 90°C to form a polyvinyl alcohol solution, cool to 25°C, add formula amount of aldehyde and catalyst to reactor A at the same time, and then add the Oxygen agent for acetalization reaction. During the reaction, keep the temperature in the range of 25~27℃. When the product precipitates out as powder or floc, continue the reaction for 2 hours, and then add the organic solvent of the formula to the reactor A Keep the temperature at 65°C, continue the reaction for 5 hours to finish, keep the material in the reactor A at 60°C for standby use, that is, in the reactor A, a mixture material containing the product—polyvinyl acetal resin is obtained.

[0050] (2) Post-processing process:

[0051] Add 1400kg of pH=8...

Embodiment 5

[0059] Comparison of the main formula parameters and product results of Example 5 and Comparative Examples 3 and 4:

[0060]

[0061] It can be seen from the comparison of the above table that in the method of the present invention, the utilization rate of the raw material butyraldehyde is higher, the number of post-treatments and water consumption are less, and the uniformity of the product acetal degree is better. Comparing Comparative Example 3 and Example 5, the acetal degree of the two is basically the same, but the haze of the latter is significantly smaller than the former, indicating that the latter has better acetal degree uniformity, while the former has a wider acetal degree distribution.

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Abstract

The invention discloses a preparation method of polyvinyl acetal resin, which is characterized by comprising the following steps of: taking the following raw materials in parts by weight: 100 parts of polyvinyl alcohol, 400-1,900 parts of water, 10-220 parts of aldehyde, 0.5-30 parts of catalyst, 400-9,500 parts of organic solvent and 0.01-3 parts of antioxidant; mixing the polyvinyl alcohol and water at 80-97 DEG C to form a solution; cooling to 10-40 DEG C; adding 10-100% of aldehyde and 10-100% of catalyst, adding the antioxidant, and performing an acetalation reaction at 10-40 DEG C; when a powdery or flocculent product is separated out, continuing reaction for 0.1-5 hours; adding the organic solvent and the remaining aldehyde and catalyst, and reacting at 30-80 DEG C till the end; and treating to obtain the polyvinyl acetal resin. The product prepared by the method disclosed by the invention has high acetalization degree and low haze and can be applied to the fields of paint, adhesives, ink, resin modifiers, safety glass and photovoltaic encapsulation materials.

Description

Technical field [0001] The invention belongs to the preparation of organic polymer compounds. It relates to a preparation method of polyvinyl acetal resin. The polyvinyl acetal resin product produced by the invention is mainly used in paints, adhesives, inks, resin modifiers, safety glass for automobiles, and safety glass for construction. For example, safety glass and photovoltaic packaging materials such as glass curtain wall, decorative glass, sound insulation glass and digital glass. Background technique [0002] Polyvinyl acetal (Polyvinyl acetal) materials have a wide range of uses, among which polyvinyl formal (PVF) and polyvinyl butyral (PVB) are the main ones. Taking PVB as an example, it can be used as paints, adhesives, inks, resin modifiers, safety glass interlayers, etc. due to differences in viscosity and vinyl alcohol content. Among them, the amount of safety glass interlayer film accounts for about 90% of the total PVB consumption. Usually, the PVB resin contain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F16/06C08F8/28C08F16/38C08F6/10
Inventor 陈小强徐康林代三威
Owner SICHUAN DONGFANG INSULATING MATERIAL
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