Search

CN-116496613-B - Preparation method and application of modified polyphenyl ether foamed sheet

CN116496613BCN 116496613 BCN116496613 BCN 116496613BCN-116496613-B

Abstract

The invention relates to a preparation method and application of a modified polyphenyl ether foamed sheet, and belongs to the technical field of new material preparation. By adopting the preparation method provided by the invention, the extrusion modification and mould pressing foaming combined production process can realize continuous production of the high-magnification flame-retardant polyphenyl ether plate, and the production efficiency is high. The PA6 modified polyphenyl ether can overcome the orientation of molecular chains, increase the free volume among molecules and smoothly extrude and form a plate with the thickness of 8-10 mm. The mould pressing foaming adopts a supercritical fluid technology, the diameter of the foam holes is small (20-50 mu m), the foaming multiplying power is high (10-20 times), the limiting oxygen index is high (26-32%), and the combustion grade reaches UL94-V0 grade. The PA6 modified polyphenyl ether is used, the thermal deformation temperature of the product is high (HDT is higher than 150 ℃), and the product can be used in the fields of power batteries, energy storage batteries and new energy automobiles.

Inventors

  • LI WEI
  • AN YUXIAN
  • ZHOU HUIPENG

Assignees

  • 江苏中科聚合新材料产业技术研究院有限公司

Dates

Publication Date
20260512
Application Date
20230511

Claims (9)

  1. 1. The preparation method of the modified polyphenyl ether foaming sheet material is characterized by comprising the following raw materials in parts by weight: 100 parts of polyphenyl ether; 20-30 parts of nylon 6; 10-15 parts of a compatilizer; 0.5-1 part of antioxidant; The preparation method comprises the following specific preparation steps: 1) Fully drying and mixing polyphenyl ether resin, nylon 6, a compatilizer and an antioxidant, using a double-screw extruder to melt and blend, and extruding and molding through a die to prepare a polyphenyl ether embryo plate to be foamed and modified; 2) And placing the polyphenyl ether embryo plate to be foamed in a die cavity with a constant temperature T, filling supercritical fluid for permeation and swelling to reach an equilibrium state, and rapidly decompressing and foaming to obtain the polyphenyl ether foaming plate with 10-20 times of foaming.
  2. 2. The method for preparing the modified polyphenyl ether foamed sheet as set forth in claim 1, wherein the polyphenyl ether has a glass transition temperature of 211 ℃, a density of 1.06g/ml, a melt flow rate of 4-15g/10min and a test condition of 315 ℃/10kg, and is blue star LXR045 or LXR050; The density of the nylon 6 is 1.13-1.14g/ml, the melt flow rate is 2.6-2.8g/10min, and the test condition is 260 ℃ per 2.16 kg; the compatilizer is a polymer containing maleic anhydride groups, and is a styrene-maleic anhydride copolymer, namely SMA and polyphenylene oxide grafted maleic anhydride, namely PPO-g-MAH; the antioxidant is an antioxidant 168 and an antioxidant 1010, and the antioxidant 168 and the antioxidant 1010 are compounded according to a ratio of 2:1.
  3. 3. The method for preparing the modified polyphenyl ether foamed sheet as set forth in claim 1, wherein the melt blending extrusion mode in the step 1) comprises twin-screw melt blending extrusion; The temperature of the melt blending extrusion is 265-285 ℃; the rotating speed of the screw rod for melt blending extrusion is 80-200 rpm; the die is a clothes hanger type die, and the thickness of the modified polyphenyl ether blank plate to be foamed is 8-10mm.
  4. 4. The method for preparing the modified polyphenyl ether foamed sheet as set forth in claim 1, wherein in the step 2), the modified polyphenyl ether master batch is placed in a die cavity with a constant temperature T, wherein the temperature T is lower than the glass transition temperature Tg of polyphenyl ether, and the temperature T is particularly 185-195 ℃.
  5. 5. The method for preparing the modified polyphenyl ether foamed sheet as set forth in claim 1, wherein the supercritical fluid adopted in the step 2) is supercritical N 2 and/or CO 2 , the supercritical fluid pressure is 7.2-20MPa, and the swelling equilibrium time is 1-1.5h.
  6. 6. The preparation method of the modified polyphenyl ether foamed sheet as set forth in claim 1, wherein the step 2) is characterized in that the pressure in the system is directly released to 0 through pressure release foaming, and the pressure release rate is 10-80MPa/s.
  7. 7. The method for preparing the modified polyphenyl ether foaming sheet material as set forth in claim 1, wherein the polyphenyl ether foaming sheet material prepared by the pressure release foaming in the step 2) has the density of 50-100g/L and the expansion of 10-20 times relative to the blank plate.
  8. 8. The method for preparing the modified polyphenyl ether foam board as set forth in claim 1, wherein the polyphenyl ether foam board prepared by the pressure release foaming in the step 2) has a cell diameter of 20-50 μm, a limiting oxygen index of 26-29% and a flame retardant grade of UL 94-V0.
  9. 9. The application of the modified polyphenyl ether foaming sheet material prepared by the method of claim 1 is characterized in that the modified polyphenyl ether foaming sheet material is used for preparing 5G communication, power batteries and new energy automobile materials.

Description

Preparation method and application of modified polyphenyl ether foamed sheet Technical Field The invention relates to a preparation method and application of a modified polyphenyl ether foamed sheet, and belongs to the technical field of new material preparation. Background Polyphenylene oxide, PPO for short, is a high-temperature resistant self-flame retardant amorphous resin, has excellent dimensional stability, chemical resistance, heat resistance, electrical insulation, high-strength mechanical property, good high-wear-resistance processing property and the like, and is widely applied to various fields of machinery, automobiles, electronic appliances, photovoltaics and the like. In general, polyphenylene ether has a series of processing problems due to a rigid chain structure, such as high viscosity and poor fluidity, and is commonly used for preparing alloys by blending with other resins such as PA, PC, PS, PP. The foaming capacity of the non-modified polyphenyl ether is weaker, the foaming rate is generally lower, and the foaming is 1-3 times. In the prior art, HIPS, PS and other modified polyphenyl ether can be used for improving the foaming multiplying power, the foaming multiplying power can reach 5-10 times, meanwhile, performance attenuation is brought, typical performances such as heat distortion temperature and oxygen index reduction cannot meet the requirements of the fields of power batteries, 5G communication and the like on high-temperature-resistant and high-flame-retardant materials. The modified polyphenyl ether has certain foaming capacity, and the prepared foaming product has the advantages of light weight, material saving, energy saving, environmental protection, impact resistance, energy absorption and the like, so that a large amount of raw materials can be saved, and the waste of earth resources is reduced. Meanwhile, the heat insulation material has excellent heat insulation property, and can be applied to battery heat management, new energy automobile heat insulation and other purposes. In view of the above-mentioned drawbacks, the present invention is to create a method for preparing a modified polyphenylene oxide foamed sheet and application thereof, so that the modified polyphenylene oxide foamed sheet has more industrial application value. Disclosure of Invention In order to solve the technical problems, the invention aims to provide a preparation method and application of a modified polyphenyl ether foamed sheet. The invention relates to a modified polyphenyl ether foaming board which comprises the following raw materials in parts by weight: 100 parts of polyphenyl ether; 20-30 parts of nylon 6; 10-15 parts of a compatilizer; 0.5-1 part of antioxidant. Further, the polyphenylene ether has a glass transition temperature of 211 ℃, a density of 1.06g/ml, and a melt flow rate of 4 to 15g/10min (315 ℃ per 10 kg), preferably blue stars LXR045 and LXR050; The density of the nylon 6 is 1.13-1.14g/ml, and the melt flow rate is 2.6-2.8g/10min (260 ℃ C./2.16 kg); the compatilizer is a polymer containing maleic anhydride groups, preferably styrene-maleic anhydride copolymer (SMA) and polyphenyl ether grafted maleic anhydride (PPO-g-MAH); the antioxidant is an antioxidant 168 and an antioxidant 1010, and the antioxidant 168 and the antioxidant 1010 are compounded according to a ratio of 2:1. The preparation method of the modified polyphenyl ether foamed sheet comprises the following specific preparation steps: 1) Fully drying and mixing polyphenyl ether resin, nylon 6, a compatilizer and an antioxidant, using a double-screw extruder to melt and blend, and extruding and molding through a die to prepare a polyphenyl ether embryo plate to be foamed and modified; 2) And placing the polyphenyl ether embryo plate to be foamed in a die cavity with a constant temperature T, filling supercritical fluid for permeation and swelling to reach an equilibrium state, and rapidly decompressing and foaming to obtain the polyphenyl ether foaming plate with 10-20 times of foaming. Further, the melt blending extrusion mode in the step 1) comprises twin-screw melt blending extrusion; The temperature of the melt blending extrusion is 265-285 ℃; the rotating speed of the screw rod for melt blending extrusion is 80-200 rpm; the die is a clothes hanger type die, and the thickness of the modified polyphenyl ether blank plate to be foamed is 8-10mm. Further, step 2) the modified polyphenylene ether embryo plate is placed in a mold cavity at a constant temperature T below the glass transition temperature Tg of the polyphenylene ether, preferably 185-195 ℃. Further, the supercritical fluid adopted in the step 2) is supercritical N 2 and/or CO 2, the supercritical fluid pressure is 7.2-20MPa, preferably 13-16MPa, and the swelling balance time is 1-1.5h. Further, in the step 2), the pressure in the system is directly released to 0 through pressure release foaming, and the pressure release rate is 10-80MPa/s, preferably