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CN-121989534-A - Self-reinforced polypropylene composite board and continuous molding preparation method and application thereof

CN121989534ACN 121989534 ACN121989534 ACN 121989534ACN-121989534-A

Abstract

The invention relates to the technical field of preparation and molding of polymer composite materials, in particular to a self-reinforced polypropylene composite board, a continuous molding preparation method and application thereof. Laminating and preheating the self-reinforced polypropylene woven cloth to obtain a preheated woven cloth, sequentially passing the preheated woven cloth through four temperature areas under the clamping of mirror polishing or frosted matte steel belts to obtain the self-reinforced polypropylene composite board, wherein the temperature of the four temperature areas is 100-130 ℃, the temperature of the first area is 130-170 ℃, the temperature of the third area is 100-130 ℃, the temperature of the fourth area is 50-100 ℃, and the pressure of the four temperature areas is 0.5-5 MPa. The invention can realize continuous production of homogeneous laminated plates or sandwich structure plates, effectively solves the problems of low efficiency, uneven product thickness, poor appearance and the like of the traditional process, and has small thickness deviation (less + -5%), smooth surface and excellent mechanical property.

Inventors

  • YANG JIE
  • ZHOU LI
  • LU CHENGYONG
  • ZHOU BIN
  • YING SONGSONG
  • Lv Chaomu

Assignees

  • 浙江华江科技股份有限公司

Dates

Publication Date
20260508
Application Date
20251230

Claims (10)

  1. 1. The continuous molding preparation method of the self-reinforced polypropylene composite board is characterized by comprising the following steps of: 1) Laminating and preheating self-reinforced polypropylene woven cloth to obtain preheated woven cloth; 2) Sequentially passing the preheated woven cloth in the step 1) through four temperature areas under the clamping of mirror polishing or frosting matte steel belts to obtain a self-reinforced polypropylene composite board; the speed of the preheated woven cloth passing through the four temperature areas is 0.3-5 m/min; The temperatures of the four temperature areas are 100-130 ℃, 130-170 ℃, 100-130 ℃ in the third area and 50-100 ℃ in the fourth area; The pressure of the four temperature areas is 0.5-5 MPa.
  2. 2. The continuous molding preparation method according to claim 1, wherein the number of layers of the self-reinforced polypropylene woven cloth laminated in step 1) is 1-30; The gram weight of the self-reinforced polypropylene woven cloth is 100-130g/m 2 .
  3. 3. The continuous molding preparation method according to claim 1, wherein the preheating temperature in step 1) is 60-100 ℃, and the speed of the self-reinforced polypropylene woven cloth passing through the preheating zone is 0.3-5 m/min.
  4. 4. The continuous molding preparation method according to claim 1, wherein the temperatures of the four temperature zones in step 2) are 110-120 ℃, 135-145 ℃, 110-120 ℃ in the third zone and 60-80 ℃.
  5. 5. The continuous molding preparation method according to claim 1, wherein the pressure of the four temperature areas in step 2) is 1-3 mpa.
  6. 6. The continuous molding preparation method as claimed in claim 1, wherein in step 1), a core material is placed in the laminate, and the core material is combined with the self-reinforced polypropylene woven fabrics of the upper and lower layers through adhesive films.
  7. 7. The continuous molding preparation method according to claim 6, wherein the core material comprises a polypropylene microcellular foam board and/or a polypropylene honeycomb, and the adhesive film comprises a low-melting polypropylene adhesive film.
  8. 8. The continuous molding preparation method according to claim 7, wherein the thickness of the polypropylene microporous foam board is 0.8-10 mm, and the density is 36-90 kg/m 3 ; the polypropylene honeycomb is 6-12-hole honeycomb, the thickness of the polypropylene honeycomb is 5-10 mm, and the volume density is 60-120 kg/m 3 ; The gram weight of the low-melting-point polypropylene adhesive film is 35-80 g/m 2 , and the melting point is 130-150 ℃.
  9. 9. A self-reinforced polypropylene composite board prepared by the preparation method of any one of claims 1 to 8.
  10. 10. The use of the self-reinforced polypropylene composite board of claim 9 in the preparation of a car rearview mirror housing, a two-shot molding of a antiskid plate, a van body or a floor.

Description

Self-reinforced polypropylene composite board and continuous molding preparation method and application thereof Technical Field The invention relates to the technical field of preparation and molding of polymer composite materials, in particular to a self-reinforced polypropylene composite board, a continuous molding preparation method and application thereof. Background The Self-reinforced polypropylene (Self-reinforced Polypropylene, SRPP) composite material has wide application prospect in the fields of automobile weight reduction, packaging, building materials and the like due to the light weight, high specific strength, excellent impact resistance and completely recyclable environment-friendly property. The material is generally composed of a high-orientation polypropylene fiber reinforced polypropylene matrix, so that homogeneous compounding is realized, performance defects caused by poor compatibility between the matrix and a reinforced phase interface in the traditional fiber reinforced composite material are avoided, and meanwhile, the material has good molding processability and recycling property. At present, the self-reinforced polypropylene plate is formed by a flat plate hot-pressing process or a Teflon belt compound machine hot-pressing process, and is formed by laminating a plurality of SRPP single layers or compounding the SRPP single layers with core materials (such as microporous foaming polypropylene and polypropylene honeycomb) and then hot-pressing and cooling. However, the conventional flat plate hot pressing process (CN 117901324A) has the following limitations that firstly, the hot pressing and cooling processes are not usually carried out in the same equipment, the intermittent production mode is realized, manual operation is needed, continuous production is difficult to realize, the time consumption is long, the production efficiency is low, and secondly, the quality problems of uneven thickness, uneven surface and the like are easy to occur due to insufficient thickness control precision of the plate in the forming process, and the consistency of the finished product performance is influenced. The traditional Teflon belt compounding machine hot pressing process has the following problems that firstly, the compounding pressure is small, the compaction of the SRPP plate is difficult to realize, the bonding between the SRPP woven fabrics is poor, the porosity is high, the mechanical strength is poor, and secondly, the Teflon belt equipped with the compounding machine has the surface state of the SRPP is poor due to the rough texture. In order to improve the production efficiency and ensure the product quality, development of a process method capable of realizing efficient, continuous and stable forming of the SRPP plate is needed. Especially in mass production, how to realize continuous thermoforming and cooling operation from SRPP woven cloth to plate materials, and reduction of intermediate transfer and waiting time become key for improving the overall processing efficiency. Disclosure of Invention In order to solve the problems, the invention provides a self-reinforced polypropylene composite board, a continuous molding preparation method and application thereof, and the invention is based on a hot-press-cold-press continuous molding system, and SRPP woven cloth is continuously fed into a steel belt machine to realize seamless connection of hot-press molding and cooling shaping. The method not only remarkably improves the production efficiency of the SRPP plate and realizes real continuous operation, but also effectively controls the thickness uniformity and the dimensional accuracy of the plate by optimizing the technological parameters, is suitable for the preparation of self-reinforced polypropylene plates with various laminated structures and sandwich structures, and has good technological compatibility and economy. In order to achieve the above object, the present invention provides the following technical solutions: the invention provides a continuous molding preparation method of a self-reinforced polypropylene composite board, which comprises the following steps: 1) Laminating and preheating self-reinforced polypropylene woven cloth to obtain preheated woven cloth; 2) Sequentially passing the preheated woven cloth in the step 1) through four temperature areas under the clamping of mirror polishing or frosting matte steel belts to obtain a self-reinforced polypropylene composite board; the speed of the preheated woven cloth passing through the four temperature areas is 0.3-5 m/min; The temperatures of the four temperature areas are 100-130 ℃, 130-170 ℃, 100-130 ℃ in the third area and 50-100 ℃ in the fourth area; The pressure of the four temperature areas is 0.5-5 MPa. Preferably, the number of layers of the self-reinforced polypropylene woven cloth laminated in the step 1) is 1-30; The gram weight of the self-reinforced polypropylene woven cloth is 100-130g/m 2. Preferabl