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A preparation method of a special auxiliary agent for increasing the conversion rate of polybutene-1 crystal form and the application of the special auxiliary agent

A technology of crystal transformation and polybutene, which is applied in the field of polymer materials, can solve the problems that cannot be applied in practice, and achieve the effect of accelerating the crystal transformation rate, improving the effect, and simple reaction principle

Active Publication Date: 2021-12-10
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

However, the PB-1 in the above research is completely transformed in about 44 hours, and the completion of the transformation in 44 hours is far from meeting the requirements of practical applications.

Method used

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  • A preparation method of a special auxiliary agent for increasing the conversion rate of polybutene-1 crystal form and the application of the special auxiliary agent

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Embodiment 1

[0024] Dissolve 5 g of norbornene dicarboxylic acid aluminum salt white solid powder in 100 ml of N,N-dimethylformamide at 130° C. After it was completely dissolved, an excess concentration of 30% hydrochloric acid solution was slowly added dropwise to the mixture at room temperature, and the pH value of the reactant was kept at 3. Add 1 g of bacterial cellulose powder with a particle size of 20 μm to the above-mentioned reactant, stir to make it uniformly dispersed. Then, a 50% sodium hydroxide solution was added dropwise to the reactant to maintain the pH value of the system at 8. The temperature of the reactants was maintained at 80°C, and the reaction was stirred for 4 hours. After the reaction, the solid product was filtered, washed with water and dried. The dried powder was then placed in 100 ml of N,N-dimethylformamide at 130° C. to remove impurities. Finally, after filtering, washing with water and drying, the white powder of the special additive that can greatly in...

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Abstract

The present invention relates to a preparation method and the application of a special auxiliary agent for improving the conversion rate of polybutene-1 crystal form, which belongs to the technical field of polymer materials, and specifically comprises norbornene dicarboxylic acid soap metal salt Dissolve the white solid powder in N, N-dimethylformamide and dissolve completely; then slowly add hydrochloric acid solution dropwise to adjust the pH value to between 2-5; add cellulose powder to the above system, stir to disperse Uniform; then add dropwise sodium hydroxide solution, adjust the pH value to 8-10, and maintain it at 80°C-100°C, stir and react for 2-6 hours; after the reaction, filter the solid product, wash it with water, and dry it , and then placed in N,N-dimethylformamide to remove impurities, and finally filtered, washed, and dried to obtain a white powder. The white powder is a special auxiliary agent. The special auxiliary agent prepared by the present invention can make PB- 1 The time for transforming into a stable crystal form I after melt processing can be shortened to about 36 hours, enabling large-scale production and application of PB‑1.

Description

technical field [0001] The invention relates to a method for preparing a special auxiliary agent for increasing the conversion rate of polybutene-1 crystal form and the application of the special auxiliary agent, belonging to the technical field of polymer materials. Background technique [0002] Polybutene-1 (PB-1) has excellent comprehensive properties, and is especially suitable for hot water pipes in the fields of drinking and heating. Compared with the current domestic mainstream random copolymer polypropylene (PP-R) pipes, PB-1 pipes have the advantages of strong hoop stress tolerance for long-term use, excellent creep resistance, low energy consumption, and no scaling. The performance is similar to PP-R. However, PB-1 is a polymorphic polymer. After melt processing and molding, the unstable crystalline form II is first formed, and it can be transformed into a stable and utilizable crystalline form I after 7 days at room temperature. The above shortcomings limit the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/20C08L1/10
CPCC08L23/20C08L2205/24C08L1/10
Inventor 王波李旺林福华杨彰雄刘焱超韩晓静李静博
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY