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CN-121991434-A - Preparation method of high-UV-resistant modified PP composite material

CN121991434ACN 121991434 ACN121991434 ACN 121991434ACN-121991434-A

Abstract

The invention relates to the technical field of polypropylene composite material preparation, and discloses a preparation method of a high-UV-resistant modified PP composite material, which comprises the following steps of S1, according to parts by weight, adding 20-30 parts of bench plastic PP3003 raw materials, 10-20 parts of bench plastic PP1005 raw materials, 50-70 parts of Zhonghua PP4220 raw materials, 00952-5 parts of PP UV-resistant master batch XR and 0.1-3 parts of titanium pigment, and S2, sequentially adding three PP raw materials into a high-speed mixer according to the sequence of bench plastic PP3003 raw materials, bench plastic PP1005 raw materials and Zhonghua PP4220 raw materials, stirring for 5-8 minutes at 800-1000r/min, and completing gradient premixing of PP resins with different melt fingers to obtain a PP matrix premix. The problem of uneven mixing is solved, namely the sequencing blanking gradient premixing process enables PP resins with different melt fingers to be fully compatible through step feeding and gradient stirring, and the fluctuation range of the batch-to-batch performance is less than or equal to 3 percent, which is far superior to more than 10 percent of the prior art.

Inventors

  • LIN HAIJUN

Assignees

  • 东莞市精林塑胶科技有限公司

Dates

Publication Date
20260508
Application Date
20260323

Claims (6)

  1. 1. The preparation method of the high-UV-resistant modified PP composite material is characterized by comprising the following steps of: The modified PP composite material comprises, by weight, 20-30 parts of a bench plastic PP3003 raw material, 10-20 parts of a bench plastic PP1005 raw material, 50-70 parts of a Zhonghua PP4220 raw material, 00952-5 parts of a PP anti-UV master batch XR and 0.1-3% of titanium pigment (based on the total raw material mass); S2, sequencing a blanking gradient premixing step, namely sequentially adding three PP raw materials into a high-speed mixer according to the sequence of the bench plastic PP3003 raw materials, the bench plastic PP1005 raw materials and the Zhonghua PP4220 raw materials, stirring for 5-8 minutes at 800-1000r/min, and completing gradient premixing of PP resins with different melt fingers to obtain a PP matrix premix; S3, adding the PP anti-UV master batch XR0095 into the PP matrix premix step by step, stirring for 3-5 minutes at 1000-1200r/min, adding titanium dioxide 1-2 times, stirring for 2-3 minutes at 1200-1500r/min after each addition, and controlling the total stirring time to be 5-8 minutes to obtain the modified PP premix; And S4, a step of melt extrusion granulation, namely putting the modified PP premix into a double-screw extruder, setting the temperature of each section of the extruder to be 180-220 ℃, and obtaining the high-UV-resistant modified PP composite material through melt extrusion, water cooling and granulating at the screw rotating speed of 300-400 r/min.
  2. 2. The preparation method of claim 1, wherein in S1, the dosage of the PP anti-UV master batch XR0095 is 2.5-4 parts, and the dosage of the titanium dioxide is 0.5% -2.5% in parts by weight, 22-28 parts of the bench plastic PP3003 raw material, 12-18 parts of the bench plastic PP1005 raw material and 55-65 parts of the Zhonghua PP4220 raw material.
  3. 3. The preparation method according to claim 1, wherein in S2, the stirring temperature of the high-speed mixer is 25-40 ℃, the blanking interval time of the three PP raw materials is 1-2 minutes, and the mixer is kept running at a low speed (300-500 r/min) during the interval period, so that raw materials are prevented from accumulating.
  4. 4. The preparation method according to claim 1, wherein in S3, the titanium dioxide is added for 2 times, the first time is added with 60% -70% of the total amount of the titanium dioxide, stirred for 2-3 minutes, the second time is added with the rest of the titanium dioxide, stirred for 2-3 minutes, the particle size of the titanium dioxide is 100-300nm, and the titanium dioxide is subjected to surface modification treatment by a silane coupling agent.
  5. 5. The preparation method according to claim 1, wherein in S4, the feeding speed of the twin-screw extruder is 80-120r/min, the vacuum degree of the extruder is-0.06-0.08 MPa, the particle size of the obtained modified PP composite material particles after granulating is 2-4mm, and the water content is less than or equal to 0.1%.
  6. 6. The method of any one of claims 1-5, wherein the high resistance UV modified PP composite has a tensile strength retention of greater than or equal to 95% and a breaking strength retention of greater than or equal to 90% after 200 hours UVB lamp accelerated aging test by astm g154 standard.

Description

Preparation method of high-UV-resistant modified PP composite material Technical Field The invention relates to the technical field of polypropylene composite material preparation, in particular to a preparation method of a high-UV-resistant modified PP composite material. Background Polypropylene (PP) materials are widely applied to the fields of outdoor products, automobile exterior trim, photovoltaic brackets and the like due to the advantages of light weight, excellent mechanical properties, convenience in processing and forming and the like. However, tertiary carbon bonds in the PP molecular chain are easy to undergo photo-oxidative degradation under the irradiation of ultraviolet rays, so that the mechanical properties of the material are suddenly reduced, the appearance is aged and brittle, and the outdoor application range of the PP molecular chain is limited. The existing anti-UV modified PP process adopts a direct blending mode, and has two major industrial pain points, namely, firstly, when PP resins with different melt fingers are directly mixed, phase separation is easy to occur due to melt viscosity difference, so that the stability of a composite material batch is poor, secondly, when an anti-UV auxiliary agent (such as titanium white powder and anti-UV master batch) is directly added at one time, agglomeration is easy to occur, the UV shielding efficiency is reduced, the mechanical property of a PP matrix is damaged, and in addition, the problem of uneven dispersion of the auxiliary agent is further aggravated by a random blanking stirring mode, so that the fluctuation of the anti-UV performance of a product is large. Therefore, a preparation method of the high-UV-resistant modified PP composite material is provided for solving the problems. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides a preparation method of a high-UV-resistant modified PP composite material, which solves the problems in the prior art. (II) technical scheme In order to achieve the aim, the invention provides the following technical scheme that the preparation method of the high-UV-resistant modified PP composite material comprises the following steps of: The modified PP composite material comprises, by weight, 20-30 parts of a bench plastic PP3003 raw material, 10-20 parts of a bench plastic PP1005 raw material, 50-70 parts of a Zhonghua PP4220 raw material, 00952-5 parts of a PP anti-UV master batch XR and 0.1-3% of titanium pigment (based on the total raw material mass); S2, sequencing a blanking gradient premixing step, namely sequentially adding three PP raw materials into a high-speed mixer according to the sequence of the bench plastic PP3003 raw materials, the bench plastic PP1005 raw materials and the Zhonghua PP4220 raw materials, stirring for 5-8 minutes at 800-1000r/min, and completing gradient premixing of PP resins with different melt fingers to obtain a PP matrix premix; S3, adding the PP anti-UV master batch XR0095 into the PP matrix premix step by step, stirring for 3-5 minutes at 1000-1200r/min, adding titanium dioxide 1-2 times, stirring for 2-3 minutes at 1200-1500r/min after each addition, and controlling the total stirring time to be 5-8 minutes to obtain the modified PP premix; And S4, a step of melt extrusion granulation, namely putting the modified PP premix into a double-screw extruder, setting the temperature of each section of the extruder to be 180-220 ℃, and obtaining the high-UV-resistant modified PP composite material through melt extrusion, water cooling and granulating at the screw rotating speed of 300-400 r/min. Preferably, in S1, the weight parts of the bench plastic PP3003 raw material are 22-28 parts, the weight parts of the bench plastic PP1005 raw material are 12-18 parts, the weight parts of the Zhonghua Guangzhou PP4220 raw material are 55-65 parts, the dosage of the PP anti-UV master batch XR0095 is 2.5-4 parts, and the dosage of the titanium pigment is 0.5% -2.5%. Preferably, in S2, the stirring temperature of the high-speed mixer is 25-40 ℃, the blanking interval time of the three PP raw materials is 1-2 minutes, and the mixer is kept running at a low speed (300-500 r/min) during the interval period, so that raw materials are prevented from accumulating. Preferably, in S3, the titanium dioxide is added for 2 times, wherein 60% -70% of the total amount of the titanium dioxide is added for the first time and stirred for 2-3 minutes, the rest titanium dioxide is added for the second time and stirred for 2-3 minutes, the particle size of the titanium dioxide is 100-300nm, and the titanium dioxide is subjected to surface modification treatment by a silane coupling agent. Preferably, in S4, the feeding rotating speed of the twin-screw extruder is 80-120r/min, the vacuum degree of the extruder is-0.06-0.08 MPa, the particle size of the obtained modified PP composite material particles after granulating is 2-4