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CN-122011486-A - Preparation method of modified MPV (MPV) foaming particles

CN122011486ACN 122011486 ACN122011486 ACN 122011486ACN-122011486-A

Abstract

The application relates to a preparation method of modified MPV expanded particles, which comprises the following steps of S1, weighing TPO, SEBS, PP, light calcium carbonate, white oil, zinc stearate and an antioxidant, S2, putting raw materials into a double-screw extruder, carrying out melt blending, simultaneously injecting supercritical carbon dioxide into a melt, carrying out mixing and plasticizing, extruding the melt through a die head, then carrying out underwater granulating to obtain a wet MPV expanded particle primary product, S3, drying and cooling the wet MPV expanded particle primary product to obtain a cooled MPV expanded particle primary product, S4, conveying the cooled MPV expanded particle to a corona treatment device for corona treatment, immediately dipping or spraying aqueous glue on the particle after treatment, S5, drying the particle coated with the aqueous glue, cooling and packaging to obtain a modified MPV expanded particle finished product. The application has the effect of improving the cohesiveness and long-term cohesiveness of the modified MPV foaming particles.

Inventors

  • LIU YANG
  • SHAN XIUJUN
  • ZHANG ZUNJIE

Assignees

  • 苏州大乘环保新材有限公司

Dates

Publication Date
20260512
Application Date
20260206

Claims (10)

  1. 1. A preparation method of modified MPV foaming particles is characterized by comprising the following steps: S1, preparing raw materials, namely weighing 16-20 parts of TPO, 14-18 parts of SEBS, 5-8 parts of PP, 35-45 parts of light calcium carbonate, 16-20 parts of white oil, 0.05-0.15 part of zinc stearate and 0.3-0.7 part of antioxidant according to parts by weight; S2, melt blending and foaming granulation, namely putting the raw materials configured in the step S1 into a double-screw extruder for melt blending, simultaneously injecting supercritical carbon dioxide serving as a physical foaming agent into a melt through a critical state carbon dioxide injector arranged on the double-screw extruder, extruding the melt through a die head after full mixing and plasticizing, and then performing underwater granulation to obtain a wet MPV foaming particle primary product; s3, drying and cooling, namely drying the wet primary product of the MPV foaming particles to remove surface moisture, and then cooling to obtain the cooled primary product of the MPV foaming particles; s4, surface corona treatment and aqueous glue coating, namely conveying the cooled MPV foaming particles to a corona treatment device for corona treatment, and immediately dipping or spraying the particles with aqueous glue after the corona treatment to form a glue liquid film on the surfaces of the MPV foaming particles; s5, drying and obtaining a finished product after coating, namely drying the particles coated with the aqueous glue, solidifying the glue into a film, cooling and packaging to obtain a finished product of the modified MPV foaming particles.
  2. 2. The method for preparing modified MPV foam particles of claim 1, wherein the aqueous glue comprises methyl methacrylate, butyl acrylate, acrylic acid, hydroxyethyl acrylate, acrylamide, a polyacrylic acid composite system and a fluorinated inorganic filler, wherein the fluorinated inorganic filler comprises a mica composite and 1H, 2H-perfluoro decyl triethoxysilane.
  3. 3. The method for preparing modified MPV foam particles of claim 2, wherein the fluorinated inorganic filler is prepared by the following method: Mixing mica powder, cobalt acetate tetrahydrate, ethylene glycol, sodium acetate and water, heating in a reaction kettle for reaction, washing and drying to obtain a mica compound, mixing acetic acid, tetrabutyl titanate and absolute ethyl alcohol to obtain a tetrabutyl titanate solution, mixing water, acetic acid and absolute ethyl alcohol, stirring, adding the mica compound, continuously stirring, regulating the pH value of the system to be acidic to obtain a mica dispersion liquid, adding the tetrabutyl titanate solution into the mica dispersion liquid, stirring under the water bath condition, drying and washing, and finally drying again to obtain the mica compound, mixing the mica compound with absolute ethyl alcohol, adding 1H, 2H-perfluorodecyl triethoxysilane and deionized water, stirring and drying to obtain the fluorinated inorganic filler.
  4. 4. The method for preparing modified MPV foam particles as claimed in claim 3, wherein the mass ratio of the mica powder, the cobalt acetate tetrahydrate and the tetrabutyl titanate is 1 (14-18): 9.8.
  5. 5. The method for producing a modified MPV foam particle as claimed in claim 3, wherein the mass ratio of the mica composite to 1H, 2H-perfluorodecyl triethoxysilane is 1 (0.05-0.06).
  6. 6. The method for preparing modified MPV foam particles of claim 2, wherein the polyacrylic acid composite system comprises polyacrylic acid, 1-ethyl-3- (3-dimethylaminopropyl) carbodiimide and L-cysteine.
  7. 7. The method for preparing modified MPV foam particles of claim 6, wherein the polyacrylic acid composite system is prepared by the following steps: Mixing polyacrylic acid with water, adding 1-ethyl-3- (3-dimethylaminopropyl) carbodiimide, continuously stirring, adding a connecting agent, stirring for reaction, dialyzing to remove unreacted substances and byproducts after reaction, and freeze-drying after dialysis is finished to obtain a polyacrylic acid composite system.
  8. 8. The method of producing a modified MPV foam particle of claim 7, wherein the linker comprises L-cysteine.
  9. 9. The method for producing a modified MPV foam particle as claimed in claim 7, wherein the mass ratio of the acrylic acid, the 1-ethyl-3- (3-dimethylaminopropyl) carbodiimide and the linking agent is 1 (0.25-0.35): 0.4.
  10. 10. The method for producing a modified MPV foam particle as claimed in claim 2, wherein the mass ratio of the polyacrylic acid composite system to the fluorinated inorganic filler is (5-7): 1.

Description

Preparation method of modified MPV (MPV) foaming particles Technical Field The application relates to the technical field of polymer material processing, in particular to a preparation method of modified MPV foaming particles. Background The MPV foaming particles are prepared by taking polyolefin materials such as SEBS (styrene-ethylene-butylene-styrene block copolymer), TPO (thermoplastic polyolefin elastomer), PP (polypropylene) and the like as main raw materials through blending, extrusion, foaming and granulation, and have wide market application prospect in various fields such as sports ground mats, packaging cushioning materials, shoe materials and the like by virtue of the outstanding characteristics of light weight, excellent flexibility, good rebound resilience and the like. However, the polyolefin material is a nonpolar substance, so that the surface energy of the MPV foaming particles is low and the polarity is weak, and when the polyolefin material is compounded with a polar adhesive (particularly an aqueous adhesive widely popularized under the environmental trend), the problems of insufficient bonding strength and easy delamination in the use process generally exist, so that the application of the polyolefin material in a high-end bonding compound scene is severely limited. In order to improve the surface adhesion performance of polyolefin, surface modification techniques such as corona treatment, flame treatment or plasma are commonly adopted in the industry. Among them, corona treatment has become the mainstream technology because of high efficiency, low cost and easy integration in the production line. However, the corona treatment has obvious defect of timeliness, namely, polar groups introduced into the surface of the treated material gradually decay along with the migration of molecular chain segments, so that the surface energy is reduced, and the bonding strength is obviously reduced along with time. This is particularly disadvantageous for MPV foamed particles that require storage, transportation, etc. and then bonding to form, and often require secondary treatment during actual processing, increasing process and cost. Disclosure of Invention In order to improve the cohesiveness and long-acting cohesiveness of the MPV foaming particles, the application provides a preparation method of modified MPV foaming particles. The preparation method of the modified MPV foaming particles provided by the application adopts the following technical scheme: a preparation method of modified MPV foaming particles comprises the following steps: S1, preparing raw materials, namely weighing 16-20 parts of TPO, 14-18 parts of SEBS, 5-8 parts of PP, 35-45 parts of light calcium carbonate, 16-20 parts of white oil, 0.05-0.15 part of zinc stearate and 0.3-0.7 part of antioxidant according to parts by weight; S2, melt blending and foaming granulation, namely putting the raw materials configured in the step S1 into a double-screw extruder for melt blending, simultaneously injecting supercritical carbon dioxide serving as a physical foaming agent into a melt through a critical state carbon dioxide injector arranged on the double-screw extruder, extruding the melt through a die head after full mixing and plasticizing, and then performing underwater granulation to obtain a wet MPV foaming particle primary product; s3, drying and cooling, namely drying the wet primary product of the MPV foaming particles to remove surface moisture, and then cooling to obtain the cooled primary product of the MPV foaming particles; s4, surface corona treatment and aqueous glue coating, namely conveying the cooled MPV foaming particles to a corona treatment device for corona treatment, and immediately dipping or spraying the particles with aqueous glue after the corona treatment to form a glue liquid film on the surfaces of the MPV foaming particles; s5, drying and obtaining a finished product after coating, namely drying the particles coated with the aqueous glue, solidifying the glue into a film, cooling and packaging to obtain a finished product of the modified MPV foaming particles. Through adopting above-mentioned technical scheme, through TPO, SEBS, PP of specific ratio and filling oil, calcium powder complex for the MPV foaming granule that obtains possesses excellent pliability and workability, and the waterborne glue of cladding immediately after the corona treatment forms synergistic effect-corona promotes granule surface polarity in the twinkling of an eye, generates active functional group, and the cladding can lock active surface fast immediately, avoids polar functional group migration decay, forms stable polarity coating after the glue liquid film solidification to improve corona timeliness defect, promotes granule and polar adhesive's bonding stability by a wide margin. Preferably, the aqueous glue comprises methyl methacrylate, butyl acrylate, acrylic acid, hydroxyethyl acrylate, acrylamide, a polyacrylic acid compos