A kind of polypropylene material with high weld line strength and preparation method thereof

A polypropylene material, high-melting technology, applied in the field of polymer material processing and molding, can solve the problems of difficulty in realization, hindering the orientation of polypropylene molecular chains and glass fibers, and high cost

Active Publication Date: 2022-04-22
WANHUA CHEM (SICHUAN) CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, there have been some methods for improving weld lines of polypropylene materials, such as CN 200720121116.6, which eliminates weld lines by changing molds, but this method is expensive, and there are many types of molds for different parts, so it is not easy to implement
CN101735508A improves the strength of the weld line by modifying the mineral filler and glass fiber, adding an interface modifier to improve the interface combination of the three, hindering the orientation of the polypropylene molecular chain and the glass fiber along the vertical flow direction, but the The method is close to the interface bonding force so that the strength of the weld line can only be improved to a limited extent

Method used

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  • A kind of polypropylene material with high weld line strength and preparation method thereof
  • A kind of polypropylene material with high weld line strength and preparation method thereof
  • A kind of polypropylene material with high weld line strength and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Prepare AB 2 : Add 10.51g diethanolamine and 30ml methanol into a four-necked bottle connected with nitrogen protection, condenser, and mechanical stirring, start stirring, drop 8.6g methyl acrylate at room temperature, stir the mixture for 30min under nitrogen protection, and slowly heat up to 33°C, react for 4h, vacuumize for 1h to remove methanol, cool and discharge to obtain AB 2 .

[0042] Preparation of hydroxyl-terminated hyperbranched polyesters:

[0043] Add 159.53g of AB to a four-necked flask equipped with a thermometer, a stirring device, a nitrogen device and a Dean-Stark device 2 , 31.49g of trimethylolpropane and 3.10g of p-toluenesulfonic acid, slowly heated to 120°C, after the reactants were completely melted, kept at 120°C for 4h. Methanol produced by the reaction was collected with a Dean-Stark device. After the reaction was over, the product was taken out while it was hot.

[0044] Preparation of modified hyperbranched polyester:

[0045] Slowl...

Embodiment 2

[0049] Prepare AB 2 : Add 10.51g diethanolamine and 30ml methanol into a four-necked bottle connected with nitrogen protection, condenser, and mechanical stirring, start stirring, drop 8.6g methyl acrylate at room temperature, stir the mixture for 30min under nitrogen protection, and slowly heat up to 33°C, react for 4h, vacuumize for 1h to remove methanol, cool and discharge to obtain AB 2 .

[0050] Preparation of hydroxyl-terminated hyperbranched polyesters:

[0051] Add 159.53g of AB to a four-necked flask equipped with a thermometer, a stirring device, a nitrogen device and a Dean-Stark device 2, 31.49g of trimethylolpropane and 3.10g of p-toluenesulfonic acid, slowly heated to 120°C, after the reactants were completely melted, kept at 120°C for 5h. Methanol produced by the reaction was collected with a Dean-Stark device. After the reaction was over, the product was taken out while it was hot.

[0052] Preparation of modified hyperbranched polyester:

[0053] Slowly...

Embodiment 3

[0055] Prepare AB 2 : Add 10.51g diethanolamine and 30ml methanol into a four-necked bottle connected with nitrogen protection, condenser, and mechanical stirring, start stirring, drop 8.6g methyl acrylate at room temperature, stir the mixture for 30min under nitrogen protection, and slowly heat up to 33°C, react for 4h, vacuumize for 1h to remove methanol, cool and discharge to obtain AB 2 .

[0056] Preparation of hydroxyl-terminated hyperbranched polyesters:

[0057] Add 159.53g of AB to a four-necked flask equipped with a thermometer, a stirring device, a nitrogen device and a Dean-Stark device 2 , 31.49g of trimethylolpropane and 3.10g of p-toluenesulfonic acid, slowly heated to 120°C, after the reactants were completely melted, kept at 120°C for 5h. Methanol produced by the reaction was collected with a Dean-Stark device. After the reaction was over, the product was taken out while it was hot.

[0058] Preparation of modified hyperbranched polyester:

[0059] Slowl...

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Abstract

The invention provides a polypropylene material with high weld line strength and a preparation method thereof. The polypropylene material is composed of the following components: polypropylene resin, polypropylene grafted MAH, modified hyperbranched polyester, filler and other additives. The present invention adds modified hyperbranched polyester, and the polymer contains polar functional groups such as ‑OSOO‑, ‑N‑, ‑O‑, and can form strong bonds with interface modifiers and modified fillers through hydrogen bonds and polar bonds. Interface binding. In addition, the polymer contains a long-chain hyperbranched structure with large steric hindrance. These two aspects weaken the orientation of the modified filler and the polypropylene chain structure along the vertical flow direction, and strengthen the bridging structure of the weld line interface, thereby improving the weld line strength of the polypropylene material.

Description

technical field [0001] The invention belongs to the field of polymer material processing and molding, and in particular relates to a polypropylene material with high weld line strength and a preparation method thereof. Background technique [0002] As one of the most widely used thermoplastic polymer materials in the world, polypropylene is non-toxic, low density, high melting point, wide source, easy to process, and has good mechanical properties and chemical stability. It is used in automobiles, household appliances, electronics, The preferred application material in packaging, building materials and other fields. [0003] When molding as a part, in the case of multi-gate injection molding, the polypropylene plastic melt will flow in more than two directions in the mold. The strength of the weld line is generally 10% to 90% of the original material. In order to improve and avoid the adverse effect of the weld line on the plastic parts during use, it is urgent to solve the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L51/06C08L87/00C08K5/42C08K5/134C08K7/14C08K3/26C08K9/06C08K9/04
CPCC08L23/12C08K2003/265C08L2205/03C08L51/06C08L87/00C08K5/42C08K5/1345C08K7/14C08K3/26C08K9/06C08K9/04
Inventor 亓玉翠陈海波张红于洪杰赵喆王进尧
Owner WANHUA CHEM (SICHUAN) CO LTD
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