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Polyvinyl butyral synthesizing method

A polyvinyl butyral and synthesis method technology, which is applied in the field of polymer resin synthesis, can solve the problems of complex process and high energy consumption, and achieve the effects of accelerating the reaction rate, reducing energy consumption, and ensuring consistency

Inactive Publication Date: 2017-12-08
TSINGHUA UNIV
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  • Description
  • Claims
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Problems solved by technology

[0005] In order to solve the problems of complicated process and high energy consumption in the prior art, the present invention proposes a synthetic method of polyvinyl butyral

Method used

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  • Polyvinyl butyral synthesizing method

Examples

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Embodiment 1

[0033] The synthetic technique of present embodiment polyvinyl butyral is as figure 1 .

[0034] Reaction conditions: the massfraction of polyvinyl alcohol in raw material A is 2%, the mass ratio of hydrogen chloride and polyvinyl alcohol is 0.5:1, and the solvent of raw material A is water; Raw material B is n-butyraldehyde, controls n-butyraldehyde and The mass ratio of polyvinyl alcohol in raw material A is 0.8:1; the temperature of the first-stage high-temperature reaction is 50°C, and the reaction time is 9.8s; the temperature of the second-stage low-temperature aging is 30°C, and the reaction time is 5h.

[0035] Reaction device: there is a T-shaped tiny channel inside the microreactor, the angle between the inlet channel of raw material A and raw material B is 90°, the angle between the outlet channel and the inlet channel of raw material A is 180°; the size of the inlet channel is 1.0mm×0.5mm , the outlet channel size is 1.0mm×1.0mm. The aging reactor is a tank react...

Embodiment 2

[0038] The synthetic technique of present embodiment polyvinyl butyral is as figure 1 .

[0039] Reaction conditions: the massfraction of polyvinyl alcohol in raw material A is 6%, the mass ratio of hydrogen chloride and polyvinyl alcohol is 0.3:1, and the solvent of raw material A is water; Raw material B is n-butyraldehyde, controls n-butyraldehyde and The mass ratio of polyvinyl alcohol in raw material A is 1:1; the temperature of the first-stage high-temperature reaction is 70°C, and the reaction time is 9.8s; the temperature of the second-stage low-temperature aging is 50°C, and the reaction time is 5h.

[0040] Reaction device: there is a T-shaped tiny channel inside the microreactor, the angle between the inlet channel of raw material A and raw material B is 90°, the angle between the outlet channel and the inlet channel of raw material A is 180°; the size of the inlet channel is 1.0mm×0.5mm , the outlet channel size is 1.0mm×1.0mm. The aging reactor is a tank reactor...

Embodiment 3

[0043] The synthetic technique of present embodiment polyvinyl butyral is as figure 2 .

[0044] Reaction condition: the massfraction of polyvinyl alcohol in raw material A is 8%, the mass ratio of hydrogen chloride and polyvinyl alcohol is 0.1:1, and the solvent of raw material A is water; Raw material B is n-butyraldehyde, controls n-butyraldehyde and The mass ratio of polyvinyl alcohol in raw material A is 0.6:1; the temperature of the first-stage high-temperature reaction is 60°C, and the reaction time is 9.8s; the temperature of the second-stage low-temperature aging is 45°C, and the reaction time is 5h.

[0045] Reaction device: There is a metal sintered membrane with a pore size of 2 μm inside the microreactor. The aging reactor is a tank reactor with a heat exchange jacket.

[0046] Reaction result: the degree of acetalization of the product polyvinyl butyral is 79.8%, and the macroscopic appearance of the product is white finely dispersed particles.

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Abstract

The invention discloses a polyvinyl butyral synthesizing method belonging to the technical field of polymer resin synthesis. The polyvinyl butyral synthesizing method utilizes a high temperature feeding and low temperature aging temperature control method to synthesize polyvinyl butyral; with the help of high-efficiency mixing micro reaction equipment, butyraldehyde is dissolved into a polyvinyl alcohol water solution of hydrochloric acid under 50 to 80 DEG C; thus, the situation that a first stage of reaction is finished under a homogeneous phase condition is guaranteed, reaction time is shortened, semi-acetalation of a large amount of butyraldehyde is achieved, later reaction load is effectively reduced, and product acetalization degree consistency and product batch stability are guaranteed; a second stage of reaction is performed under 30 to 60 DEG C to finish acetalization and further improve a product acetalization degree, a reaction speed of acetalization under a relatively low temperature can be effectively controlled, and mutual crosslinking among product molecules is reduced. The temperature control method of the synthesizing method disclosed by the invention is a gradual temperature fall period, avoids extra refrigeration and can shorten reaction time and reduce energy consumption.

Description

technical field [0001] The invention belongs to the technical field of polymer resin synthesis, and in particular relates to a synthesis method of polyvinyl butyral. Background technique [0002] Polyvinyl butyral, referred to as PVB, because of its good adhesion, transparency, impact resistance, low temperature resistance, light resistance, heat resistance and other properties, it is widely used in safety glass, solar cell packaging materials, high-power LED heat dissipation materials and other fields have a wide range of applications. With the development of the national economy, the market demand for high-quality PVB continues to increase. [0003] Polyvinyl butyral (PVB) is the condensation reaction product of polyvinyl alcohol (PVA) and butyraldehyde under the catalysis of acid. In order to meet the requirements of the application, the degree of acetalization of PVB usually needs to reach more than 78% and have a porous microscopic morphology. The traditional method ...

Claims

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Application Information

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IPC IPC(8): C08F8/28C08F16/06
CPCC08F8/28C08F16/06
Inventor 骆广生周柏杨林茜妍王凯
Owner TSINGHUA UNIV
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