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Long-chain branching polymer-type processing aid and preparation method and application thereof

A processing aid and long-chain branching technology, which is applied in the field of long-chain branched polymer processing aids and their preparation, can solve the problem of poor controllability of product structure, difficulty in feasibility, reduction of biodegradability and thermoplasticity Processing performance and other issues

Active Publication Date: 2018-09-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method for preparing long-chain branched copolymers disclosed by Liu et al., the reaction of chain extender and trihydroxyl prepolymer is involved, so that there is still the possibility of crosslinking reaction in the preparation process, so that the preparation process and The controllability of the product structure is poor, and it will also reduce the biodegradability and thermoplastic processing performance of the prepared material, so it is difficult to have the feasibility of practical application

Method used

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  • Long-chain branching polymer-type processing aid and preparation method and application thereof
  • Long-chain branching polymer-type processing aid and preparation method and application thereof
  • Long-chain branching polymer-type processing aid and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0071] Under the protection of nitrogen, feed bismethylolpropionic acid and caprolactone at a molar ratio of 1:40, then add the catalyst stannous octoate at a molar ratio of 1:1000 to caprolactone, and react at 120°C After 48 hours, the crude product was obtained after cooling, and the obtained crude product was purified and then dried to obtain the soft segment polyester. Its structural formula is as follows:

[0072]

[0073] Under the protection of nitrogen, react at 200°C for 4h, then feed the catalyst tetrabutyl titanate and the above-mentioned soft segment polyester at a mass ratio of 1:300, and react for 4h at a vacuum degree of 100Pa and a temperature of 220°C. After cooling, the crude product is obtained, and the obtained crude product is purified and dried to obtain a long-chain branched soft segment polyester, and its structural formula is as follows:

[0074]

[0075] Under the protection of nitrogen, the above-mentioned long-chain branched soft segment polye...

Embodiment 2

[0079] Under the protection of nitrogen, feed bismethylolpropionic acid and caprolactone at a molar ratio of 1:60, then add the catalyst stannous octoate at a molar ratio of 1:1000 to caprolactone, and react at 120°C After 48 hours, the crude product was obtained after cooling, and the obtained crude product was purified and then dried to obtain the soft segment polyester.

[0080] Under the protection of nitrogen, react at 200°C for 4h, then feed the catalyst tetrabutyl titanate and the above-mentioned soft segment polyester at a mass ratio of 1:300, and react for 4h at a vacuum degree of 100Pa and a temperature of 220°C. After cooling, a crude product is obtained, which is purified and then dried to obtain a long-chain branched soft segment polyester.

[0081] Under the protection of nitrogen, the above-mentioned long-chain branched soft segment polyester and L-lactide are fed in a mass ratio of 3:2, and then the catalyst octanoic acid is added in a molar ratio of 1:500 to l...

Embodiment 3

[0083] Under the protection of argon, feed 3,5-cis-dihydroxyheptanoic acid and γ-butyrolactone at a molar ratio of 1:200, and then add octanoic acid as a catalyst at a molar ratio of 1:2000 to caprolactone Stannous, reacted at 90°C for 60 hours, and obtained a crude product after cooling. The obtained crude product was purified and then dried to obtain a soft segment polyester.

[0084] Under the protection of argon, react at 240°C for 2h, then feed the catalyst tetrabutyl titanate and the above soft segment polyester at a mass ratio of 1:200, and react for 1h at a vacuum degree of 20Pa and a temperature of 250°C After cooling, a crude product is obtained, and the obtained crude product is purified and then dried to obtain a long-chain branched soft segment polyester.

[0085] Under the protection of argon, feed the above-mentioned long-chain branched soft segment polyester and L-lactide in a mass ratio of 3:2, and then add a catalyst with a molar ratio of 1:100 to lactide St...

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Abstract

The invention discloses a long-chain branching polymer-type processing aid. The long-chain branching polymer-type processing aid I is obtained by ring-opening polymerization and polycondensation reaction of the double-hydroxy acid and the lactone sequentially, or the obtained long-chain branching polymer-type processing aid I is further subjected to ring-opening polymerization with the propyl acetate to obtain the long-chain branching polymer-type processing aid II. Because the long-chain branching polymer-type processing aid has the characteristics of long chain branching on the self-structure, the structure of physical cross-linked network similar to rubber can be formed, which can be applied to polyester toughening, in particular, when the long-chain branching polymer-type processing aid is mixed with the PLA, the elongation at break of the PLA matrix can be greatly increased, the cross-linking can be avoided in the preparation process, the transparency and the biodegradability of the PLA can be maintained, and the crystallization rate of the PLA can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of polymer processing aids, and relates to a long-chain branched polymer-type processing aid for improving polyester melt strength, crystallization rate and toughness, a preparation method thereof and an application thereof, especially for improving polyester melt strength, crystallization rate and toughness. Polylactic acid melt strength, crystallization rate and toughness long-chain branched polymer processing aid, its preparation method and its blending application with polylactic acid. Background technique [0002] Polylactic acid (PLA) is a thermoplastic aliphatic polyester with excellent biodegradability, biocompatibility and mechanical properties. At present, polylactic acid is mainly used in biomedical materials, food packaging and other fields. Unfortunately, PLA has low melt strength and slow crystallization rate, which not only limits its molding process, but also its low elongation at break grea...

Claims

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Application Information

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IPC IPC(8): C08G63/08C08L67/04
CPCC08G63/08C08L67/04C08L2205/025
Inventor 王玉忠杨丹丹陈思翀朱红梅刘文
Owner SICHUAN UNIV
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