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CN-117089198-B - High-fluidity polyetherimide composite material and preparation method thereof

CN117089198BCN 117089198 BCN117089198 BCN 117089198BCN-117089198-B

Abstract

The invention relates to the field of polymer materials and discloses a high-fluidity polyetherimide composite material and a preparation method thereof, wherein the raw materials comprise, by weight, 85-99 parts of polyetherimide, 0.1-5 parts of compatibilizer, 1-10 parts of thermotropic liquid crystal polymer, 0.1-0.3 part of antioxidant and 0.1-0.3 part of acid absorber, and the compatibilizer is modified polyetherimide, wherein the modified polyetherimide contains carboxyl side groups. The modified polyetherimide with a specific structure is used as the compatibilizer, so that the fluidity of the polyetherimide is improved, and the dielectric loss of the composite material is not improved.

Inventors

  • SHEN YANG
  • NAN CEWEN
  • JIANG LIHANG
  • JIANG JIANYONG
  • PAN JIAYU
  • HU PENGHAO

Assignees

  • 乌镇实验室

Dates

Publication Date
20260512
Application Date
20230815

Claims (9)

  1. 1. The high-fluidity polyetherimide composite material is characterized by comprising, by weight, 85-99 parts of polyetherimide, 0.1-5 parts of a compatibilizer, 1-10 parts of a thermotropic liquid crystal polymer, 0.1-0.3 part of an antioxidant and 0.1-0.3 part of an acid absorber; the compatibilizer is modified polyetherimide, and the modified polyetherimide contains the following chain segments: ; Wherein n=65 to 75; the thermotropic liquid crystal polymer contains ester groups.
  2. 2. The high-fluidity polyetherimide composite material of claim 1, wherein the preparation method of the modified polyetherimide comprises the following steps: a) Dissolving bisphenol A type diether dianhydride in an organic solvent to obtain bisphenol A type diether dianhydride solution; B) Dropwise adding 3, 5-diaminobenzoic acid into bisphenol A type diether dianhydride solution, and stirring and reacting in an ice water bath under the protection of nitrogen to obtain polyetherimide acid; C) Removing nitrogen and ice water bath, adding acetic anhydride and pyridine into polyetherimide acid, heating and refluxing to react, pouring the product into excessive absolute ethyl alcohol, and separating out the product to obtain the modified polyetherimide.
  3. 3. The high-fluidity polyetherimide composite material of claim 2, wherein bisphenol A type diether dianhydride is dissolved in an organic solvent under the conditions of nitrogen protection and ice water bath in the step A), the organic solvent is N-methylpyrrolidone, and the mass fraction of the bisphenol A type diether dianhydride solution is 10-20%.
  4. 4. The high-fluidity polyetherimide composite material of claim 2, wherein the molar ratio of 3, 5-diaminobenzoic acid to bisphenol A type diether dianhydride added in the step B) is 1-1.2:1, and the stirring reaction time is 7-9 hours.
  5. 5. The high-fluidity polyetherimide composite material of claim 2, wherein the mass ratio of the acetic anhydride and the pyridine added in the step C) to the bisphenol A type diether dianhydride solution in the step B) is 10-15:5-10:100, the heating reflux reaction temperature is 150-170 ℃, and the reaction time is 3-4 hours.
  6. 6. The high flow polyetherimide composite of claim 1, wherein the antioxidant is selected from one or more of antioxidants 1010, 1076, 1098, 330.
  7. 7. The high-fluidity polyetherimide composite material of claim 1, wherein the acid absorbing agent is one or more selected from the group consisting of aluminum oxide, magnesium oxide, and calcium oxide.
  8. 8. A method for preparing the high-fluidity polyetherimide composite material according to any one of claims 1 to 7, which is characterized by comprising the steps of uniformly mixing all raw materials in proportion, and adding the raw materials into a granulator for granulation to obtain the high-fluidity polyetherimide composite material.
  9. 9. The method according to claim 8, wherein the granulating temperature is 300-390 ℃.

Description

High-fluidity polyetherimide composite material and preparation method thereof Technical Field The invention relates to the technical field of polymer materials, in particular to a high-fluidity polyetherimide composite material and a preparation method thereof. Background The polyetherimide is thermoplastic special engineering plastic with a large number of aromatic groups and amide bonds in a molecular chain, and has the mechanical characteristics of good high temperature resistance, dimensional stability, excellent chemical resistance, certain flame retardance, better electric property, high strength and high rigidity. Because of its excellent properties, it is widely used in high temperature resistant terminals, IC mounts, lighting devices, FPCBs (flexible wiring boards), liquid transport devices, aircraft interior parts, medical devices, household appliances, and the like. But because of its higher melt viscosity and processing temperature, its flow properties are more difficult to meet for the processing of complex or thinner articles. The Thermotropic Liquid Crystal Polymer (TLCP) has the characteristics of good melt processing performance, dimensional stability, self-reinforcement and the like, and the TLCP is used as a processing aid to be blended with thermoplastic plastics, so that the viscosity and the processing temperature of a composite system are reduced, and the fluidity of the composite material is improved to become a research hot spot. However, when the thermotropic liquid crystal polymer material is used as a processing aid to improve the fluidity of the polyetherimide, the poor compatibility of the thermotropic liquid crystal polymer material and the polyetherimide generally leads to the increase of dielectric loss of the polyetherimide, which affects the application of the polyetherimide in electrified parts. Disclosure of Invention The invention provides a high-fluidity polyetherimide composite material and a preparation method thereof, and aims to solve the problems that when a thermotropic liquid crystal polymer material is used as a processing aid in the prior art to improve the fluidity of polyetherimide, the dielectric loss of the polyetherimide is improved and the application of the polyetherimide in electrified parts is affected. In order to achieve the above purpose, the present invention adopts the following technical scheme: the high-fluidity polyetherimide composite material comprises, by weight, 85-99 parts of polyetherimide, 0.1-5 parts of a compatibilizer, 1-10 parts of a thermotropic liquid crystal polymer, 0.1-0.3 part of an antioxidant and 0.1-0.3 part of an acid absorber; the compatibilizer is modified polyetherimide, and the modified polyetherimide contains the following chain segments: Wherein n=65 to 75. The invention adds thermotropic liquid crystal polymer in polyetherimide, which can improve the fluidity of polyetherimide, the fluidity of the obtained composite material is more than 1.5 times of that of the original polyetherimide material, the processing performance of polyetherimide is improved, and simultaneously, the addition of TLCP can also enhance the toughness of the composite material and increase the breaking elongation of the composite material. In order to improve the compatibility of TLCP and polyetherimide and avoid the increase of dielectric loss of the composite material caused by the addition of TLCP, the modified polyetherimide with a specific structure is added as a compatibilizer, and the main chain structure of the modified polyetherimide is basically consistent with that of the polyetherimide matrix, so that the modified polyetherimide has good compatibility with the polyetherimide matrix, and the carboxyl side group contained in the modified polyetherimide has good compatibility with ester groups in the TLCP and can undergo transesterification reaction to a certain extent, so that the compatibility of the polyetherimide matrix and the TLCP can be effectively improved, the mechanical property of the composite material is improved, and meanwhile, the lower dielectric loss of the composite material can be kept, thereby being beneficial to the application of the composite material in electrified parts. The polymerization degree of the compatibilizer affects the distribution of the compatibilizer in matrix resin and the activity of carboxyl, when the polymerization degree is too high, the activity of the carboxyl is lower, the compatibility with TLCP is reduced to a certain extent, the uniformity of distribution in a polyetherimide matrix is poor, the dielectric loss of the composite material is increased, and when the polymerization degree is too low, the activity of the compatibilizer in the polyetherimide matrix is too high, and the tensile strength of the product is reduced. The invention controls the polymerization degree of the modified polyetherimide in a proper range, so that the composite material has higher mechanical property and l