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Method for enhancing crystallinity and mechanical performance of polymer, device and obtained product

A polymer and mechanical technology, applied in the field of polymer materials, can solve the problems of high heating energy consumption, complex process equipment, pollution, etc., and achieve the effect of simple process, reduced solvent consumption, and guaranteed purity

Active Publication Date: 2018-05-29
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts a process based on heat treatment, which has a series of problems such as complex process equipment, high heating energy consumption, and pollution.

Method used

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  • Method for enhancing crystallinity and mechanical performance of polymer, device and obtained product
  • Method for enhancing crystallinity and mechanical performance of polymer, device and obtained product
  • Method for enhancing crystallinity and mechanical performance of polymer, device and obtained product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The raw material is polylactic acid particles with the brand name 4032D provided by Natureworks. The specific treatment process is as follows: Step 1, remove the moisture in the raw material by vacuum drying, the drying temperature is 70°C, and the drying time is 4 hours. In the 2nd step, on the injection molding machine, the polylactic acid particles processed into elongated polylactic acid products (such as figure 2 ), the melt temperature, mold temperature, injection speed, injection pressure, holding pressure, and holding time are 175°C, 30°C, and 50cm 3 / s, 100MPa, 60MPa and 3s. Step 3: After the temperature of the autoclave is adjusted to 25°C, place the injection-molded polylactic acid product in the autoclave, then close the autoclave, and ensure that the autoclave is well sealed. In step 4, a carbon dioxide fluid medium with a pressure of 6.9 MPa is introduced into the autoclave. Step 5: After the carbon dioxide pressure in the autoclave is stable, use a te...

Embodiment 2

[0043] The raw material is polycarbonate pellets of Lexan 141R provided by Saudi Basic Innovative Plastics Company. The specific treatment process is as follows: Step 1, remove the moisture in the raw material by vacuum drying, the drying temperature is 110°C, and the drying time is 6 hours. In the 2nd step, on the injection molding machine, the high-density polycarbonate pellets processed into long polycarbonate products (such as figure 2 ), the melt temperature, mold temperature, injection speed, injection pressure, holding pressure, and holding time are 260°C, 50°C, and 40cm 3 / s, 100MPa, 60MPa and 4s. Step 3: After the temperature of the autoclave is adjusted to 25°C, place the injection-molded polycarbonate product in the autoclave, then close the autoclave, and ensure that the autoclave is well sealed. In step 4, a carbon dioxide fluid medium with a pressure of 35 MPa is introduced into the autoclave. Step 5: After the carbon dioxide pressure in the autoclave is stab...

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Abstract

The invention provides a method for enhancing crystallinity and mechanical performance of a polymer, a device and an obtained product and belongs to the technical field of polymer materials. The method comprises the steps as follows: a polymer product is placed in a closed container; a fluid under certain pressure is introduced into the closed container; after the fluid pressure is stabilized andthe fluid is left to stand for a period, the fluid pressure is relieved; then, the closed container is opened, and the polymer product treated by the fluid medium is taken out; the polymer product isleft to stand in an air or vacuum environment for a period to remove the fluid medium dissolved or left in the polymer, and a semi-crystalline polymer product with crystallinity and mechanical performance improved significantly is obtained finally. Compared with traditional thermal treatment based methods for enhancing crystallinity and mechanical performance of polymers, the method has the advantages that the treatment process can be performed in a lower-temperature environment, so that high-temperature degradation of the polymer can be effectively avoided, mechanical load is not required, and energy loss in the production process is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a method for enhancing polymer crystallization and improving polymer mechanical properties by means of fluid medium treatment, a device for realizing the method, and a product obtained by using the method. Background technique [0002] For crystalline polymer materials, crystal structure and morphology, crystallinity, etc. have an important impact on their mechanical properties. Conventional methods to enhance the crystallization of polymer materials, including heat treatment, shear-induced crystallization, nucleating agent-induced crystallization, etc., usually need to be carried out at higher temperatures, which easily leads to degradation of polymer materials, thereby affecting the quality of polymer materials. performance, especially for heat-sensitive polymer materials such as polylactic acid, thermoplastic polyurethane, etc. It is worth noting that for medical poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/02C08L67/04C08L69/00
CPCC08J7/02C08J2367/04C08J2369/00
Inventor 王桂龙赵国群柴佳龙张磊董桂伟
Owner SHANDONG UNIV
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