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CN-122011658-A - Automobile seat skin composite material based on modified PET and preparation method thereof

CN122011658ACN 122011658 ACN122011658 ACN 122011658ACN-122011658-A

Abstract

The invention relates to the technical field of polyethylene terephthalate, and particularly discloses an automobile seat skin composite material based on modified PET and a preparation method thereof. The composite material comprises modified PET resin, a toughening agent, an abrasion-resistant filler, an ultraviolet resistant agent and a multifunctional group reaction auxiliary agent, wherein the multifunctional group reaction auxiliary agent is a compound containing at least three active functional groups capable of participating in carboxyl, hydroxyl or epoxy group reaction in the molecule, and can react with the end group of the modified PET resin and the active group of the compatilizer in situ in the melt processing process to form a three-dimensional crosslinked network inside the material. The preparation method comprises the steps of modified PET resin preparation, raw material drying and the like. The invention solves the problems of poor comprehensive performance, insufficient long-term stability and the like of the existing material, has excellent mechanical, wear-resistant, ultraviolet-resistant and hydrolysis-resistant performances, moderate cost, environmental protection and recycling, and simple preparation process, and can be widely applied to automobile seat skin production.

Inventors

  • Gong Youzhi

Assignees

  • 广州金智达汽车零部件有限公司

Dates

Publication Date
20260512
Application Date
20260304

Claims (10)

  1. 1. The automobile seat skin composite material based on the modified PET is characterized by comprising, by weight, 60-85 parts of modified PET resin, 5-15 parts of a toughening agent, 3-10 parts of an abrasion-resistant filler, 0.5-2.5 parts of an ultraviolet resistant agent, 0.3-1.8 parts of an anti-hydrolysis agent, 0.2-1.2 parts of a lubricant, 1-5 parts of a compatilizer and 0.1-0.5 part of a multifunctional reaction auxiliary agent, wherein the modified PET resin is a compound of (2-4) 1-weight maleic anhydride grafted PET and epoxy chain-extended PET, and the multifunctional reaction auxiliary agent is a compound containing at least three active functional groups capable of participating in carboxyl, hydroxyl or epoxy group reaction in a molecule, and is subjected to in-situ reaction with the end groups of the modified PET resin and the active groups of the compatilizer in the melt processing process, so that a three-dimensional crosslinked network is formed inside the material.
  2. 2. The modified PET-based automotive seat skin composite according to claim 1, wherein the multifunctional reaction aid is selected from at least one of triallyl isocyanurate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate.
  3. 3. The modified PET-based automotive seat skin composite according to claim 1, wherein the toughening agent is a compound of ethylene-methyl acrylate copolymer and methyl methacrylate-butadiene-styrene copolymer grafted maleic anhydride in a weight ratio of (1-3): 1.
  4. 4. The modified PET-based automotive seat skin composite material according to claim 1, characterized in that the abrasion-resistant filler is a nano alumina modified with a silane coupling agent KH-560.
  5. 5. The modified PET-based automotive seat skin composite material according to claim 1, wherein the anti-ultraviolet agent is a compound of benzotriazole and modified inorganic nano TiO 2 in a weight ratio of (3-6): 1, wherein the inorganic nano TiO 2 is surface-modified by a silane coupling agent KH-550.
  6. 6. The modified PET-based automotive seat skin composite material according to claim 1, wherein the hydrolysis inhibitor is a carbodiimide-based hydrolysis inhibitor.
  7. 7. The modified PET-based automotive seat skin composite of claim 1, wherein the compatibilizer is a styrene-maleic anhydride copolymer.
  8. 8. The modified PET-based automotive seat skin composite of claim 1, wherein the lubricant is a compound of pentaerythritol stearate and ethylene bis-stearamide in a weight ratio of (1.5-3): 1.
  9. 9. The modified PET-based automotive seat skin composite material according to claim 1, wherein the preparation raw materials of the epoxy chain-extended PET comprise PET chips, an epoxy chain extender and an antioxidant, wherein the epoxy chain extender is bisphenol a type epoxy resin, and the antioxidant is hindered phenols.
  10. 10. A method of preparing a modified PET-based automotive seat skin composite according to any one of claims 1 to 9, comprising the steps of: s1, preparing modified PET resin, namely uniformly mixing maleic anhydride grafted PET and epoxy chain-extended PET according to a weight ratio to obtain modified PET resin; s2, drying the raw materials, namely drying the wear-resistant filler, the anti-ultraviolet agent, the anti-hydrolysis agent, the multifunctional reaction auxiliary agent, the lubricant and the compatilizer, and sealing and storing in a dry environment for later use; s3, mixing and granulating, namely uniformly mixing the dried raw materials except the multifunctional reaction auxiliary agent, modified PET resin and a toughening agent, and then feeding the mixture into a double-screw extruder for melt extrusion and granulating to obtain composite master batches; and S4, molding, namely drying the composite master batch, mixing with the multifunctional reaction auxiliary agent, performing injection molding, and cooling to room temperature to obtain the finished product of the automobile seat skin composite material.

Description

Automobile seat skin composite material based on modified PET and preparation method thereof Technical Field The invention relates to the technical field of polyethylene terephthalate, in particular to an automobile seat skin composite material based on modified PET and a preparation method thereof. Background The automobile seat skin is used as one of core components of the automobile interior, directly influences the texture, comfort, durability and safety of the automobile interior, and simultaneously meets the industry development requirements of light weight, environmental protection and low cost. At present, the common materials for automobile seat skins mainly comprise natural leather, PU leather, PVC leather, common polyethylene terephthalate (PET) based composite materials and the like. The natural leather has the advantages of good texture, good comfort, high cost, high maintenance difficulty, resource shortage, soft hand feeling, moderate cost, aging resistance and poor wear resistance, is easy to crack and delaminate after long-term use, and part of PVC leather contains harmful volatile matters and does not meet the environmental protection requirement, and the common PET material has the advantages of low cost, good chemical corrosion resistance, easy processing, recoverability and the like, but has the defects of low crystallization speed, poor impact toughness, insufficient scratch resistance, poor hydrolysis resistance, poor ultraviolet resistance and the like, and cannot meet the requirements of mechanical property and environmental adaptability in the long-term use process when being directly applied to the automobile seat skin, so that the common PET material is limited to wide application in the automobile interior trim field. In order to improve the performance defect of PET materials, a single modification mode (such as grafting modification, blending modification or filler modification) is often adopted in the prior art to modify PET, but the single modification mode is difficult to simultaneously consider the comprehensive properties of toughness, wear resistance, ultraviolet resistance, hydrolytic resistance and the like of the materials, the compatibility of the modified materials with other components is poor, the problems of uneven component dispersion, weak interface binding force and the like easily occur, the mechanical properties of the composite materials are unstable, and the severe use requirements of automobile seat skins cannot be met. Meanwhile, the internal molecular chain combination of the existing modified PET composite material is mainly linear, the interfacial binding force still has room for improvement, and the mechanical property and the long-term stability of the hydrolysis resistance are insufficient. Therefore, the research and development of the modified PET automobile seat skin composite material with excellent comprehensive performance, simple and feasible preparation process and moderate cost and compact internal combination becomes a research focus in the field of the current automobile interior material. Disclosure of Invention The invention aims to provide a modified PET-based automobile seat skin composite material and a preparation method thereof, which are used for solving the problems in the background technology. In order to achieve the aim, the invention provides an automobile seat skin composite material based on modified PET, which comprises, by weight, 60-85 parts of modified PET resin, 5-15 parts of a toughening agent, 3-10 parts of an abrasion-resistant filler, 0.5-2.5 parts of an ultraviolet resistant agent, 0.3-1.8 parts of an anti-hydrolysis agent, 0.2-1.2 parts of a lubricant, 1-5 parts of a compatilizer and 0.1-0.5 part of a multifunctional reaction auxiliary agent. The modified PET resin is a compound of maleic anhydride grafted PET and epoxy chain-extended PET, and the weight ratio of the maleic anhydride grafted PET to the epoxy chain-extended PET is (2-4): 1. The multifunctional reaction auxiliary agent is a compound with at least three active functional groups capable of participating in carboxyl, hydroxyl or epoxy group reaction in the molecule, and can react with the end group of the modified PET resin and the active group of the compatilizer in situ in the melt processing process to form a three-dimensional crosslinked network inside the material. The modified PET resin is formed by compounding maleic anhydride grafted PET and epoxy chain-extended PET, and a synergistic modification system is constructed by matching components such as a toughening agent, wear-resistant filler, a multifunctional group reaction auxiliary agent and the like in a specific proportion, so that the performance defect of the common PET is fundamentally improved. The maleic anhydride grafted PET can introduce maleic anhydride polar groups on PET molecular chains, so that on one hand, the compatibility with other components such as a toughening agent, a