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CN-122011582-A - Low-temperature melting regeneration preparation method of resin fiber plastic honeycomb composite board

CN122011582ACN 122011582 ACN122011582 ACN 122011582ACN-122011582-A

Abstract

The invention relates to the technical field of high polymer material recycling, and discloses a low-temperature melting regeneration preparation method of a resin fiber plastic honeycomb composite board, which comprises the steps of premixing and coating broken materials with polypropylene wax and N, N' -ethylene bis stearamide; the method comprises the steps of extruding at low temperature through a main feeding port, wrapping semi-molten crushed materials with a liquid phase carrier formed by melting polypropylene wax, conveying the semi-molten crushed materials, adding reactive repair master batches containing functionalized elastomer and zinc stearate through a side feeding port, inducing zinc ions and the elastomer to carry out coordination reaction under the action of a shearing field to construct an ion crosslinking network, and finally carrying out vacuum devolatilization granulation to obtain regenerated particles. According to the invention, the liquid phase lubrication protection and the in-situ chemical tackifying are realized through a step-by-step feeding process, the mechanical breaking of glass fibers in the processing process is effectively reduced, the interfacial bonding of a resin matrix and the fibers is reconstructed, and the tensile strength, the flexural modulus and the notch impact performance of the regenerated material are remarkably improved.

Inventors

  • WANG YINFANG

Assignees

  • 山东佳纳环保科技有限公司

Dates

Publication Date
20260512
Application Date
20260307

Claims (10)

  1. 1. The low-temperature melting regeneration preparation method of the resin fiber plastic honeycomb composite board is characterized by comprising the following steps of: S1, weighing broken materials of waste resin fiber plastic honeycomb composite plates, polypropylene wax and N, N '-ethylene bis stearamide, and mixing at normal temperature to enable the polypropylene wax and the N, N' -ethylene bis stearamide to be coated on the surface of the broken materials, so as to obtain premix; S2, adding the premix through a main feeding port of an extruder, setting the temperature of a low-temperature feeding and carrier phase change region of the extruder, and melting the polypropylene wax to form a liquid phase carrier to wrap broken materials in a semi-molten state for conveying; S3, adding reactive repair master batches containing functionalized elastomer and zinc stearate through a side feeding port positioned at the downstream of the main feeding port of the extruder, setting the temperature of a side feeding mixing and liquid phase infiltration zone, and enabling the zinc stearate to be melted and infiltrated into a resin and fiber interface; S4, the materials enter an in-situ tackifying and reaction control area, zinc ions are induced to carry out coordination reaction with the functional elastomer under the action of a shearing field, and an ion crosslinking network is constructed; s5, performing vacuum devolatilization on the materials in a devolatilization and pressure-stabilizing extrusion zone, and extruding and granulating the materials by a machine head to obtain regenerated modified particles.
  2. 2. The low-temperature melting regeneration preparation method of the resin fiber plastic honeycomb composite board according to claim 1, wherein the raw materials in the step S1 and the step S3 are prepared from the following raw materials in parts by weight: 100 parts of crushed material of waste resin fiber plastic honeycomb composite board, 1.6-2.8 parts of polypropylene wax, 0.4-0.7 part of N, N' -ethylene bis stearamide and 4.5-7.5 parts of reactive repair master batch.
  3. 3. The method for preparing the resin fiber plastic honeycomb composite board by low-temperature melting regeneration according to claim 1, wherein the temperature of the phase change area of the low-temperature feeding and the carrier is 155-170 ℃, and the rotating speed of a screw is 220-280 rpm; the temperature of the side-feed mixing and liquid-phase permeation zone is 160-175 ℃.
  4. 4. The method for preparing the resin fiber plastic honeycomb composite board by low-temperature melting regeneration according to claim 1, wherein the temperature of the in-situ tackifying and reaction control area is 160-175 ℃, the temperature of the devolatilization and pressure-stabilizing extrusion area is 165-180 ℃, and the temperature of a machine head die is 170-180 ℃.
  5. 5. The low-temperature melting regeneration preparation method of the resin fiber plastic honeycomb composite board according to claim 1, wherein the weight average molecular weight Mw of the polypropylene wax is 5000-6000 g/mol, the softening point is 140-145 ℃, and the melting point of the N, N' -ethylene bis stearamide is 142-146 ℃.
  6. 6. The low-temperature melting regeneration preparation method of the resin fiber plastic honeycomb composite board according to claim 1, wherein the reactive repair master batch is prepared from the following components in parts by weight: 55-65 parts by weight of metallocene polypropylene; 27-33 parts by weight of glycidyl methacrylate grafted polyolefin elastomer; 8-12 parts of zinc stearate.
  7. 7. The method for preparing the resin fiber plastic honeycomb composite board by low-temperature melting regeneration according to claim 6, wherein the reactive repair master batch is prepared by the following steps: Mixing metallocene polypropylene, glycidyl methacrylate grafted polyolefin elastomer and zinc stearate in a high-speed mixer to obtain premix, and controlling the discharge temperature below 60 ℃; Adding the premix into an extruder for melt extrusion, controlling the temperature of the material to be always lower than 140 ℃, and carrying out hot cutting granulation and drying on the air-cooled die surface to obtain the material; Wherein the temperature of each section of the extruder is set to 85-140 ℃.
  8. 8. The low-temperature melting regeneration preparation method of the resin fiber plastic honeycomb composite board according to claim 6, wherein the glycidyl methacrylate grafted polyolefin elastomer takes ethylene-octene copolymer as a matrix, the grafting rate is more than 0.8wt%, and the zinc content in the zinc stearate is 10.5wt% to 11.5wt%.
  9. 9. The low-temperature melting regeneration preparation method of the resin fiber plastic honeycomb composite board according to claim 1, wherein the crushed waste resin fiber plastic honeycomb composite board comprises matrix resin and reinforcing materials, wherein the matrix resin is isotactic polypropylene, the reinforcing materials are alkali-free glass fibers, the mass content of the reinforcing materials is 40wt%, the particle size of the crushed materials is 10mm to 20mm, and the water content is lower than 0.5wt%.
  10. 10. The method for preparing the resin fiber plastic honeycomb composite board by low-temperature melting regeneration according to claim 1, wherein the vacuum degree of vacuum devolatilization is kept between-0.06 MPa and-0.09 MPa, and the granulating mode is a water ring hot cutting process.

Description

Low-temperature melting regeneration preparation method of resin fiber plastic honeycomb composite board Technical Field The invention relates to the technical field of high polymer material recycling, in particular to a low-temperature melting regeneration preparation method of a resin fiber plastic honeycomb composite board. Background The resin fiber plastic honeycomb composite board is widely applied to the fields of logistics packaging, automotive interior trim, building turnover materials and the like because of light weight, high strength, corrosion resistance and good buffer performance. Along with the continuous increase of the yield of the materials, the quantity of the leftover materials and the waste plates after the service life is over is increased, and the materials have important environmental protection significance and economic value for recycling. At present, a method of melting granulation after physical crushing is mainly adopted for recycling the thermoplastic composite material. However, since the sheet is typically compounded from a polypropylene matrix and a glass fiber reinforcement, it is subject to significant contradiction between matrix degradation and fiber damage during secondary processing. In conventional melt extrusion processes, it is often necessary to increase the processing temperature in order to reduce the melt viscosity to reduce the mechanical shear to the glass fibers, but this can lead to severe thermo-oxidative degradation of the polypropylene matrix, leading to a decrease in molecular weight and deterioration in mechanical properties. On the contrary, if a low-temperature extrusion process is adopted to inhibit matrix degradation, huge shear stress can be generated by the high viscosity of the polypropylene melt, so that the rigid glass fiber is seriously crushed in the screw conveying process, the retention length is greatly reduced, and the reinforcing effect is lost. In addition, the interfacial bonding layer between the resin matrix and the glass fiber tends to be damaged after the waste composite board is subjected to primary processing and long-term use. The traditional recycling granulation process only carries out simple physical mixing, is difficult to repair the interface defect of the resin and the fiber at a microscopic level, leads to easy debonding at the interface when the regenerated material is stressed, is obviously reduced in notch impact strength and tensile strength, and is difficult to meet the application requirements of high-added-value products. Therefore, how to achieve effective plasticization of the resin and minimize damage to the fiber length under low temperature conditions, and to repair the interfacial bonding force in situ during processing is a technical problem to be solved in the field at present. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a low-temperature melting regeneration preparation method of a resin fiber plastic honeycomb composite board, which solves the problems of serious breakage of glass fibers caused by shearing of low-temperature high-viscosity melt and remarkable reduction of mechanical properties of regenerated materials caused by interface bonding failure in the existing recovery and regeneration process of the resin fiber plastic honeycomb composite board. The invention aims at realizing the technical scheme that the low-temperature melting regeneration preparation method of the resin fiber plastic honeycomb composite board comprises the following steps of: S1, raw material premixing and liquid film coating, namely weighing crushed materials of waste resin fiber plastic honeycomb composite plates, polypropylene wax and N, N '-ethylene bis stearamide, and mixing at normal temperature to enable the polypropylene wax and the N, N' -ethylene bis stearamide to be coated on the surface of the crushed materials to obtain a premix; S2, low-temperature feeding and carrier phase change, namely adding the premix through a main feeding port of an extruder, setting the temperature of a low-temperature feeding and carrier phase change region of the extruder, and enabling polypropylene wax to be melted to form a liquid phase carrier to wrap broken materials in a semi-molten state for conveying; S3, initiating a side feeding reaction, namely adding reactive repair master batch containing functionalized elastomer and zinc stearate through a side feeding port positioned at the downstream of a main feeding port of the extruder, setting the temperature of a side feeding mixing and liquid phase infiltration zone, and melting and infiltrating the zinc stearate into a resin and fiber interface; S4, in-situ tackifying and rheological inversion, namely, enabling the material to enter an in-situ tackifying and reaction control area, and inducing zinc ions to carry out coordination reaction with the functionalized elastomer under the action of a shearing field to construct an ionic crossl