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A kind of polyepoxy chain extender and its preparation method and application

A multi-epoxy chain extender and glycidyl ester technology, applied in the field of chain extenders, can solve the problems of large steric hindrance of the benzene ring, material accumulation in the head of a screw machine, and increasing the amount of chain extenders, so as to improve the molecular weight and process performance, avoid gels and build-up, improve the effect of use

Active Publication Date: 2022-03-08
上海涵点科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Common epoxy chain extenders are copolymers of styrene and GMA, such as CN101157739, CN103755853A, CN102936307, etc. all disclose chain extenders prepared from styrene monomers and glyceryl acrylate monomers as raw materials, but their The proportion of glyceryl acrylate is generally below 50%, making it necessary to add more chain extenders to obtain good melt index and processability
[0005] In addition, during the preparation of epoxy chain extenders, the reactivity ratios of styrene and glyceryl acrylate differ greatly. When there are more glyceryl acrylates, the epoxy groups in the molecular chain are too concentrated, making it difficult to produce evenly dispersed epoxy resins. chain extender
Moreover, the steric hindrance of the benzene ring is too large and it is not easy for the epoxy group to fully react in the subsequent application, so the utilization rate of the chain extender is low, and the amount of the chain extender needs to be increased, and the chain extender increases with the use time during use. , the head of the screw machine is easy to produce accumulated material and gel
The output speed of the screw machine is unstable, and even blockage occurs

Method used

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  • A kind of polyepoxy chain extender and its preparation method and application
  • A kind of polyepoxy chain extender and its preparation method and application
  • A kind of polyepoxy chain extender and its preparation method and application

Examples

Experimental program
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Effect test

preparation example Construction

[0054] The second aspect of the present invention provides a method for preparing the polyepoxy chain extender as described above, comprising: mixing the raw materials for the preparation of the polyepoxy chain extender, reacting and drying at 60-100°C to obtain the obtained The polyepoxy chain extender mentioned above.

[0055] In one embodiment, the preparation method of the multi-epoxy chain extender of the present invention includes: after mixing the solvent and the dispersant, heating to 60-100° C. for 0.5-2 hours, adding the initiator, the active monomer react with the mixture of chain transfer agents for 1-32 hours, filter, wash and dry to obtain the polyepoxy chain extender.

[0056] The third aspect of the present invention provides the use of the polyepoxy chain extender as described above for the processing of polymers. The present invention does not specifically limit the polymer, but it is a polymer containing functional groups such as ester groups, hydroxyl grou...

Embodiment 12

[0063] Embodiment 12 also provides the preparation method of the polyepoxy chain extender as described above, including: after mixing the solvent and the dispersant, heating to 75° C. for 1 hour, adding the mixture of the initiator, the active monomer and the chain transfer agent After reacting for 15 hours, bead-shaped solid particles were obtained, which were filtered, washed and dried to obtain the polyepoxy chain extender.

Embodiment 13

[0064] Embodiment 13 also provides the preparation method of the polyepoxy chain extender as described above, including: after mixing the solvent and the dispersant, heating to 75° C. for 1 hour, adding the mixture of the initiator, the active monomer and the chain transfer agent After reacting for 13.5 hours, bead-shaped solid particles were obtained, which were filtered, washed and dried to obtain the polyepoxy chain extender.

[0065] performance evaluation

[0066] The multi-epoxy chain extenders provided in Examples 1 to 13 were used as the experimental group, and the commercially available KL-E4370 was used as the control group, and PET and PLA were used as polymers for processing respectively. The effect of the composition and molecular weight of the copolymer of the epoxy chain extender on the processability, melt index and mechanical properties of the polymer was tested.

[0067] 1. The influence of the composition of copolymers with high benzene ring content and mul...

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Abstract

The invention relates to the technical field of chain extenders, more specifically, the invention relates to a polyepoxy chain extender and its preparation method and application. The composition of the polyepoxy chain extender includes a vinyl monomer-glycidyl methacrylate copolymer, and the glycidyl methacrylate accounts for 60-80 wt% of the copolymer. Promoting the dispersion of glycidyl methacrylate during the copolymerization process through the reaction of vinyl monomers with suitable components and glycidyl methacrylate to obtain chain extenders with high epoxy group content; chain extenders with high epoxy groups Content and good dispersibility can improve the molecular weight and processability of polymers with less chain extenders; by controlling the structure of chain extenders, adding alkyl methacrylate and styrene can adjust chain extenders The movement in the polymer avoids the phenomenon of gel and accumulation in long-term use. By adjusting the molecular weight of the chain extender, the effective group can be better dispersed in the polymer and the use effect can be improved.

Description

technical field [0001] The invention relates to the technical field of chain extenders, more specifically, the invention relates to a polyepoxy chain extender and its preparation method and application. Background technique [0002] Green and low carbon are the themes of development in the world today, and biodegradable and easy to recycle are its main forms. With the development of the plastics industry, there are many problems. On the one hand, the industrialization technology for the synthesis of bio-based and biodegradable plastics such as polylactic acid (PLA), carbon dioxide propylene oxide copolymer (PPC), and polyhydroxyalkanoate (PHAs) is becoming mature, and the industrialization scale is rapidly increasing. However, these plastics There are inherent disadvantages such as heat sensitivity, easy hydrolysis, poor melt strength and insufficient mechanical properties, and cannot even be used alone; on the other hand, polycondensation of polyester (PBT, PET), polyamide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/32C08F212/08
CPCC08F220/325C08F212/08
Inventor 沈佳兴宋唯立吕浩东
Owner 上海涵点科技有限公司
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