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CN-122011577-A - Weather-resistant modified particles for automobile exterior trim parts and preparation method thereof

CN122011577ACN 122011577 ACN122011577 ACN 122011577ACN-122011577-A

Abstract

The invention relates to the technical field of modification of high polymer materials, and discloses weather-resistant modified particles for automobile exterior trimming parts, which comprise the following components in parts by weight: 60 to 80 parts of base material resin, 5 to 20 parts of weather-resistant elastomer, 3 to 8 parts of weather-resistant master batch, 5 to 10 parts of filler and 0.5 to 2 parts of auxiliary agent; the weather-resistant master batch is prepared by the following steps: placing the carrier resin, the composite light stabilizer, the ultraviolet absorber and the antioxidant into a high-speed mixer for uniform mixing, and then blending, extruding, cooling and granulating the mixture by a double-screw extruder; the weather-resistant master batch prepared by pre-dispersing solves the problems that the auxiliary agent is easy to aggregate and migrate and run off in the traditional simple mixing, so that the effective protective components in the automobile exterior trimming part can continuously and stably play a role when facing strong ultraviolet rays, day-night temperature difference and wet-heat corrosion for a long time, thereby obviously delaying the aging process of the material.

Inventors

  • LUO HUAN
  • Xiang Shitie
  • WU YONG

Assignees

  • 安徽省仕隆新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260226

Claims (9)

  1. 1. The weather-resistant modified particles for the automotive exterior trim parts are characterized by comprising the following components in parts by weight: 60-80 parts of base material resin, 5-20 parts of weather-resistant elastomer, 3-8 parts of weather-resistant master batch, 5-10 parts of filler and 0.5-2 parts of auxiliary agent; The weather-resistant master batch is prepared by placing carrier resin, a composite light stabilizer, an ultraviolet absorber and an antioxidant into a high-speed mixer to be uniformly mixed, and then carrying out melt blending, extrusion, cooling and granulating by a double-screw extruder at a temperature lower than the conventional processing temperature of the carrier resin by 10-20 ℃.
  2. 2. The weather-resistant modified particle for automotive exterior trim parts according to claim 1, wherein the base resin is one or more of polypropylene, polypropylene copolymer, and polypropylene with high impact resistance; the weather-resistant elastomer is an ethylene-octene copolymer or an ethylene-butene copolymer.
  3. 3. The weather-resistant modified particle for automotive exterior trim parts according to claim 1, wherein the filler is talc or barium sulfate surface-treated with a silane coupling agent, and the filler has a median particle diameter of 1.5 to 3 μm.
  4. 4. The weather-resistant modified particle for automotive exterior trim part according to claim 1, wherein the carrier resin is a linear low density polyethylene or an ethylene-vinyl acetate copolymer; the compound light stabilizer is a hindered amine light stabilizer, and the hindered amine light stabilizer is a polymeric hindered amine light stabilizer with the molecular weight of more than 2000 g/mol; the ultraviolet absorber is benzotriazole or triazine ultraviolet absorber; The antioxidant is hindered phenol antioxidant.
  5. 5. The weather-resistant modified particle for automotive exterior trim parts according to claim 1, wherein the auxiliary agent is at least any two of a lubricant, an anti-hydrolysis agent and a pigment dispersant.
  6. 6. A method for preparing weather-resistant modified particles for automobile exterior trimming parts according to any one of claims 1 to 5, comprising the steps of: S1, primary mixing, namely adding the base material resin, the weather-resistant elastomer and the filler into a high-speed mixer to obtain a primary mixed material A; S2, final mixing, namely transferring the primary mixed material A into a high-speed mixer, and adding the weather-resistant master batch and a processing aid package to obtain a mixed material B; and S3, granulating, namely sending the mixture B into a double-screw extruder, and carrying out melt blending, extrusion, cooling, granulating and drying at the processing temperature of 180-220 ℃ at the screw rotating speed of 300-500 rpm to obtain the weather-resistant modified particles for the automobile exterior trim parts.
  7. 7. The method for preparing weather-resistant modified particles for automotive exterior trim parts according to claim 6, wherein in the step S1, the high-speed mixer is mixed for 5-10 minutes at 60-80 ℃, and in the step S2, the high-speed mixer is mixed for 3-5 minutes at 40-60 ℃.
  8. 8. The method for producing weather-resistant modified particles for automotive exterior trim parts according to claim 6, wherein in S3, the screw combination of the twin-screw extruder comprises at least 3 kneading blocks, and the last kneading block is located downstream of the feed port of the weather-resistant master batch.
  9. 9. The method for preparing weather-resistant modified particles for automotive exterior trim parts according to claim 6, wherein in the step S3, the melt blending process is performed in an exhaust section with a vacuum degree of-0.04 to-0.06 MPa, the extruded material strips are cooled by a water tank, the water temperature is controlled to be 25-35 ℃, and the drying condition is hot air drying for 2-4 hours at 80-100 ℃.

Description

Weather-resistant modified particles for automobile exterior trim parts and preparation method thereof Technical Field The invention relates to the technical field of modification of high polymer materials, in particular to weather-resistant modified particles for automobile exterior trimming parts and a preparation method thereof. Background Automobile exterior trim parts, such as bumpers, door handles, side skirtboards and the like, are important components of automobiles, directly affect the appearance aesthetic feeling and brand image of the automobiles, and are exposed to complex outdoor environments for a longer time, and are subjected to the examination of various severe factors such as ultraviolet irradiation, high temperature, low temperature, rain and snow, damp heat, pollutants and the like. In the prior art, plastics such as polypropylene, ABS and the like are generally adopted as base materials, and are modified by adding additives such as ultraviolet absorbers, light stabilizers, antioxidants and the like in the production process of the base materials so as to improve the ageing resistance of the materials. However, the prior art scheme has obvious defects that functional auxiliary agents, particularly powdery micromolecular auxiliary agents, are difficult to uniformly disperse in a matrix and are easy to form local agglomeration due to large difference of physical properties of the components, so that the utilization efficiency of the auxiliary agents is reduced, stress defect points inside the material are possibly formed, the auxiliary agents gradually migrate and separate out to the surface of the material in the long-term use process, or the auxiliary agents are rapidly consumed under the action of environmental factors, so that the protection effect of the auxiliary agents is rapidly attenuated, and the material still has obvious problems of yellowing, surface chalking, brittleness increase and the like. Disclosure of Invention The invention aims to provide weather-resistant modified particles for automobile exterior trimming parts and a preparation method thereof, so as to solve the problems in the background art. In order to achieve the above purpose, the present invention provides the following technical solutions: The weather-resistant modified particles for the automotive exterior trim parts comprise the following components in parts by weight: 60-80 parts of base material resin, 5-20 parts of weather-resistant elastomer, 3-8 parts of weather-resistant master batch, 5-10 parts of filler and 0.5-2 parts of auxiliary agent; The weather-resistant master batch is prepared by placing carrier resin, a composite light stabilizer, an ultraviolet absorber and an antioxidant into a high-speed mixer to be uniformly mixed, and then carrying out melt blending, extrusion, cooling and granulating by a double-screw extruder at a temperature lower than the conventional processing temperature of the carrier resin by 10-20 ℃. As a still further proposal of the invention, the base resin is one or more of polypropylene, copolypropylene and high impact polypropylene; the weather-resistant elastomer is an ethylene-octene copolymer or an ethylene-butene copolymer. In still a further aspect of the present invention, the filler is talc or barium sulfate surface-treated with a silane coupling agent, and the filler has a median particle diameter of 1.5 to 3 μm. As a still further aspect of the present invention, the carrier resin is a linear low density polyethylene or an ethylene-vinyl acetate copolymer; the compound light stabilizer is a hindered amine light stabilizer, and the hindered amine light stabilizer is a polymeric hindered amine light stabilizer with the molecular weight of more than 2000 g/mol; the ultraviolet absorber is benzotriazole or triazine ultraviolet absorber; The antioxidant is hindered phenol antioxidant. As a still further scheme of the invention, the auxiliary agent is at least any two of a lubricant, an anti-hydrolysis agent and a pigment dispersing agent. The invention also discloses a preparation method of the weather-resistant modified particles for the automotive exterior trim part, which comprises the following steps: S1, primary mixing, namely adding the base material resin, the weather-resistant elastomer and the filler into a high-speed mixer to obtain a primary mixed material A; S2, final mixing, namely transferring the primary mixed material A into a high-speed mixer, and adding the weather-resistant master batch and a processing aid package to obtain a mixed material B; and S3, granulating, namely sending the mixture B into a double-screw extruder, and carrying out melt blending, extrusion, cooling, granulating and drying at the processing temperature of 180-220 ℃ at the screw rotating speed of 300-500 rpm to obtain the weather-resistant modified particles for the automobile exterior trim parts. According to the invention, in the step S1, the high-speed mixer is used for