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High-viscosity polyvinyl butyral and preparation method thereof

A technology of polyvinyl butyral and polyvinyl alcohol, which is applied in the field of high-viscosity polyvinyl butyral and its preparation, can solve the problems of long transportation time, high price, poor transparency and haze, and achieve acetal High density, stable structure and good haze effect

Inactive Publication Date: 2017-08-08
CHENGDU YULONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, China-made high-viscosity polyvinyl butyral has problems of poor transparency and haze. Therefore, the Chinese domestic market has been occupied by foreign products, which are not only expensive, but also have high transportation costs and long transportation times.
[0004] Internationally, high-viscosity polyvinyl butyral with high transparency and haze has a complicated process and is not suitable for popularization. Therefore, there is a market demand for high-viscosity polyvinyl butyral that is easy to prepare and has high transparency and haze. is more urgent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Prepare high viscosity polyvinyl butyral as follows:

[0020] (1) Preparation of polyvinyl alcohol solution: 6 parts by mass of polyvinyl alcohol with a degree of alcoholysis of 98% and a degree of polymerization of 2700, 4 parts by mass of polyvinyl alcohol with a degree of alcoholysis of 98% and a degree of polymerization of 500 Polyvinyl alcohol with a degree of polymerization, 0.38 parts by mass of ammonium sulfate and 100 parts by mass of pure water are mixed, heated and stirred until completely dissolved, and cooled to 8°C to obtain a polyvinyl alcohol solution;

[0021] (2) Add 7.2 parts by mass of n-butyraldehyde to the above polyvinyl alcohol solution, and dropwise add 2.5 parts by mass of concentrated hydrochloric acid within 2 hours and keep it for 2 hours, then slowly heat up to 45 ° C at an average speed within 2 hours, and Cool down to room temperature after keeping for 2 hours to obtain primary high-viscosity polyvinyl butyral;

[0022] (3) Wash the abov...

Embodiment 2

[0024] Prepare high viscosity polyvinyl butyral as follows:

[0025] (1) Preparation of polyvinyl alcohol solution: 5 parts by mass of polyvinyl alcohol with a degree of alcoholysis of 98% and a degree of polymerization of 2700, 3 parts by mass of a polyvinyl alcohol with a degree of alcoholysis of 98% and a degree of polymerization of 500 Polyvinyl alcohol with a degree of polymerization, 0.35 parts by mass of ammonium sulfate and 95 parts by mass of pure water are mixed, heated and stirred until completely dissolved, and cooled to 7°C to obtain a polyvinyl alcohol solution;

[0026] (2) Add 7 mass parts of n-butyraldehyde to the above polyvinyl alcohol solution, and dropwise add 2 mass parts of concentrated hydrochloric acid within 2 hours and keep for 2 hours, then slowly heat up to 40 °C at an average speed within 2 hours, and Cool down to room temperature after keeping for 2 hours to obtain primary high-viscosity polyvinyl butyral;

[0027] (3) Wash the above-mentioned p...

Embodiment 3

[0029] Prepare high viscosity polyvinyl butyral as follows:

[0030] (1) Preparation of polyvinyl alcohol solution: 7 parts by mass of polyvinyl alcohol with a degree of alcoholysis of 98% and a degree of polymerization of 2500, 5 parts of polyvinyl alcohol with a degree of alcoholysis of 98% and a degree of polymerization of 450 Polyvinyl alcohol with a degree of polymerization, 0.40 parts by mass of ammonium sulfate and 105 parts by mass of pure water are mixed, heated and stirred until completely dissolved, and cooled to 9°C to obtain a polyvinyl alcohol solution;

[0031] (2) Add 7.5 parts by mass of n-butyraldehyde to the above polyvinyl alcohol solution, and dropwise add 3 parts by mass of concentrated hydrochloric acid within 2 hours and keep for 2 hours, then slowly heat up to 50 ° C at an average speed within 2 hours, and Cool down to room temperature after keeping for 2 hours to obtain primary high-viscosity polyvinyl butyral;

[0032] (3) Wash the above-mentioned p...

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Abstract

The invention discloses high-viscosity polyvinyl butyral. The high-viscosity polyvinyl butyral is prepared from the following raw materials in parts by weight: high-polymeric polyvinyl alcohol, low-polymeric polyvinyl alcohol, pure water, ammonium sulfate, n-butanal and concentrated hydrochloric acid. The invention also discloses a preparation method of the high-viscosity polyvinyl butyral. The preparation method comprises the following steps: preparing a polyvinyl alcohol solution; adding n-butanal and concentrated hydrocholoric acid into the polyvinyl alcohol solution, thus obtaining primary high-viscosity polyvinyl butyral; and washing the primary high-viscosity polyvinyl butyral with pure water until the pH of the washing solution is 7, and then drying to obtain the high-viscosity polyvinyl butyral finished product. The high-polymeric polyvinyl alcohol and the low-polymeric polyvinyl alcohol of different polymerization degrees are adopted to prepare the high-viscosity polyvinyl butyral together with the pure water, the ammonium sulfate, the n-butanal and the concentrated hydrochloric acid, so that not only is the obtained product stable in structure and high in degree of acetalization, good in transparency and haze, but also the process is simple, easy in preparation and suitable for being popularized.

Description

technical field [0001] The invention relates to a high-viscosity polyvinyl butyral and a preparation method thereof, belonging to the technical field of chemical material preparation. Background technique [0002] High-viscosity polyvinyl butyral, as a widely used polymer material, has good softness, flexibility, transparency and haze, so it is widely used in automotive safety glass and other product industries, and its market is huge. [0003] At present, China-made high-viscosity polyvinyl butyral has problems of poor transparency and haze. Therefore, the Chinese domestic market has been dominated by foreign products, which are not only expensive, but also have high transportation costs and long transportation times. [0004] Internationally, high-viscosity polyvinyl butyral with high transparency and haze has a complicated process and is not suitable for popularization. Therefore, there is a market demand for high-viscosity polyvinyl butyral that is easy to prepare and ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F16/06C08F8/28
CPCC08F8/28C08F16/06
Inventor 叶锐张路简帅刘铁
Owner CHENGDU YULONG CHEM
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