Polylactic acid composition containing phosphate nucleating agent and preparation method thereof

A technology of nucleating agent and phosphate, applied in the field of polylactic acid composition containing phosphate nucleating agent and its preparation, can solve the problems of poor heat resistance of polylactic acid, difficult to meet the application, slow crystallization rate, etc., and achieve improved performance , the effect of reducing the interface free energy and improving the crystallinity

Inactive Publication Date: 2021-10-15
湖南玥昇杰科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, polylactic acid has disadvantages such as poor heat resistance, and the glass transition temperature of polylactic acid products obtained by various molding methods is only 55-65°C, which is difficult to meet the practical application
After crystallization, its heat distortion temperature can be increased to above 100°C. Although polylactic acid is a crystalline polymer, it is difficult to fully crystallize in the actual molding process due to the slow crystallization rate.

Method used

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  • Polylactic acid composition containing phosphate nucleating agent and preparation method thereof
  • Polylactic acid composition containing phosphate nucleating agent and preparation method thereof
  • Polylactic acid composition containing phosphate nucleating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A phosphate nucleating agent prepared by the following steps:

[0028] Step A1: First, fill the reactor with nitrogen to discharge the air, and under the protection of nitrogen atmosphere, add 1mol of 2,2'-methylenebis(4,6-di-tert-butylphenyl)phosphate and 220g of methanol in sequence into the reactor, after 2,2'-methylenebis(4,6-di-tert-butylphenyl) phosphate is completely dissolved in methanol, then add 1.2mol sodium hydroxide to the reactor, and use hydrochloric acid Adjusting the pH value of the reaction system to 8, incubating and reacting at 20°C for 2 hours to obtain a crude product;

[0029] The reaction process is as follows:

[0030]

[0031] Step A2: Suction filter the obtained crude product, rinse it twice with deionized water, dry it in vacuum, use denatured alcohol for recrystallization purification, filter and dry it, and prepare the phosphate nucleating agent.

Embodiment 2

[0033] Step A1: firstly fill the reactor with nitrogen to discharge the air, under the protection of nitrogen atmosphere, add 1mol of 2,2'-methylenebis(4,6-di-tert-butylphenyl) phosphate and 450g of methanol in sequence Into the reactor, after 2,2'-methylenebis(4,6-di-tert-butylphenyl) phosphate is completely dissolved in methanol, add 1.3mol barium chloride to the reactor to control the reaction system The pH value of the product was 8, and the reaction was incubated at 30°C for 2 hours to obtain a crude product;

[0034] The reaction process is as follows:

[0035]

[0036] Step A2: Suction filter the obtained crude product, rinse it with deionized water for 3 times, dry it in vacuum, use denatured alcohol for recrystallization and purification, filter and dry it, and prepare the phosphate nucleating agent.

Embodiment 3

[0038] Step A1: First, fill the reactor with nitrogen to discharge the air, and under the protection of nitrogen atmosphere, add 1mol of 2,2'-methylenebis(4,6-di-tert-butylphenyl)phosphate and 460g of methanol in sequence into the reactor, after 2,2'-methylenebis(4,6-di-tert-butylphenyl) phosphate is completely dissolved in methanol, then add 1.4mol calcium hydroxide to the reactor, and use hydrochloric acid Adjust the pH value of the reaction system to 8, and keep the reaction at 40°C for 2 hours to obtain the crude product;

[0039] The reaction process is as follows:

[0040]

[0041] Step A2: Suction filter the obtained crude product, rinse it with deionized water for 3 times, dry it in vacuum, use denatured alcohol for recrystallization and purification, filter and dry it, and prepare the phosphate nucleating agent.

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Abstract

The invention relates to a polylactic acid composition containing a phosphate nucleating agent and a preparation method thereof, and belongs to the technical field of polylactic acid processing. The raw materials comprise a phosphate nucleating agent, an antioxidant, an anti-hydrolysis agent and L-polylactic acid. The polylactic acid composition is prepared by mixing the raw materials through a high-speed mixer and carrying out twin-screw extrusion granulation. In the preparation process, 2, 2'-methylene bis (4, 6-di-tert-butylphenyl) phosphate is used as a raw material and is subjected to a substitution reaction with an ionic compound under the condition that methanol is used as a solvent to obtain the phosphate nucleating agent containing two symmetrical benzene rings. When a polylactic acid melt is cooled, the phosphate nucleating agent is uniformly dispersed in the polylactic acid melt in the form of extremely tiny solid particles to serve as a heterogeneous crystal nucleus, so that the interface free energy required by polylactic acid nucleation crystallization is reduced, polylactic acid chain segments are promoted to be simultaneously crystallized by taking the crystal nucleus as the center, and the purpose of improving the crystallization rate and crystallinity of polylactic acid is achieved.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid processing, and in particular relates to a polylactic acid composition containing a phosphate nucleating agent and a preparation method thereof. Background technique [0002] Polylactic acid is a type of polyester, and lactic acid is a naturally occurring biomonomer. Polylactic acid is thermoplastic and can be processed by the production process of general plastics, such as making films, sheets and fibers. It is a bio-based degradable material with broad application prospects. [0003] However, polylactic acid has disadvantages such as poor heat resistance, and polylactic acid products obtained by various molding methods have a glass transition temperature of only 55-65°C, which is difficult to meet practical applications. After crystallization, its heat distortion temperature can be increased to above 100°C. Although polylactic acid is a crystalline polymer, it is difficult to fully crys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L79/00C08K5/527C08K5/134C07F9/6574
CPCC08L67/04C07F9/65744C08L2205/24C08L79/00C08K5/527C08K5/1345
Inventor 曾广胜彭军江太君孟聪胡灿夏桂英
Owner 湖南玥昇杰科技有限责任公司
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