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Crystalline high polymer physical foaming material preparation method

A technology of physical foaming and high polymer, which is applied in the field of preparation of crystalline polymer physical foaming materials, can solve the problems of long cycle, unstable product quality and poor foamability.

Active Publication Date: 2009-12-30
浙江博发新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can be used to solve the problem of poor foamability of every crystalline polymer, the development cost is too high and the cycle is too long
In addition, there is also the problem of unstable product quality in the application process of HMSPP, which seriously affects the production and operation cost of PP foam materials

Method used

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  • Crystalline high polymer physical foaming material preparation method
  • Crystalline high polymer physical foaming material preparation method
  • Crystalline high polymer physical foaming material preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The physical gas foaming of embodiment 1 high-density polyethylene material

[0038] High-density polyethylene (6070EA, T m =131.5°C, T end =134.3°C) the particles are placed in a high temperature and high pressure resistant mold, ensuring that the total volume of the particles does not exceed 1 / 25 of the mold volume, so that the particles have enough space for foaming. The mold temperature is 132°C, 20MPa nitrogen gas is injected, the temperature is maintained at a constant pressure for 10 minutes, the pressure is released to normal pressure at a speed of 10MPa / s, the mold is opened, and the foaming material is taken out. The test foam material density is 0.22g / cm 3 , the average pore size is 127μm, and the expansion ratio is 4.4 times.

Embodiment 2

[0039] Embodiment 2 Physical gas foaming of polyadipate-terephthalate-butylene glycol ester

[0040] Polybutylene adipate-terephthalate (PBAT, T m =128.4°C, T end =143.1°C) the particles are placed in a high temperature and high pressure resistant mold, ensuring that the total volume of the particles does not exceed 1 / 25 of the mold volume, so that the particles have enough space for foaming. The mold temperature is 138°C, 8MPa nitrogen gas is injected, the temperature is maintained at a constant pressure for 10 minutes, the pressure is released to normal pressure at a speed of 5MPa / s, the mold is opened, and the foaming material is taken out. The test foam material density is 0.20g / cm 3 , the average pore size is 250μm, and the expansion ratio is 5.8 times.

Embodiment 3

[0041] The physical gas foaming of embodiment 3 low density polyethylene material

[0042] 1) Low-density polyethylene (IF7B, T m =104.4°C, T end =110.0°C) the particles are placed in a mold resistant to high temperature and high pressure, ensuring that the total volume of the particles does not exceed 1 / 25 of the mold volume, so that the particles have enough space for foaming. The mold temperature is 108°C, 20MPa nitrogen is injected, the temperature is maintained at a constant pressure for 30 minutes, the pressure is released to normal pressure at a speed of 10MPa / s, the mold is opened, and the foaming material is taken out. The test foam material density is 0.077g / cm 3 , the average pore size is 161 μm, and the expansion ratio is 12.1 times.

[0043] 2) Low-density polyethylene / ethylene propylene block copolymer (90 / 10) blend material (K8303, Tm=164.3°C, T end =168.6°C), prepared by the MiniLab micro-blending rheometer of HAAKE Company. The melting temperature is 190°...

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Abstract

The invention discloses a crystalline high polymer physical foaming material preparation method and is characterized in that the preparation method comprises the following steps: placing crystalline high polymer in an airtight container of which the volume is 25 times or more than 25 times of the total volume of the particles and the temperature T is not less than Tm which is the melting point of the crystalline high polymer and less than Tend which is the temperature at which crystal completely melts, keeping the crystalline high polymer in partial melting state with a little crystal or crystal particles, then injecting 8-20MPa of pressure gas, keeping the temperature and the pressure for 1-30min, then relieving the pressure in a speed of 5-20MPa / s to the normal pressure, taking out the material and cooling to obtain the foaming material. In the preparation method of the invention, the rigidity of the residual crystal particles in the high polymer and the physical crosslinked network are used to limit the free movement of the high polymer chain of the melt so that the high polymer melt can coat the gas, realize crystalline high polymer foaming and solve the problem that the foamability of the crystalline high polymer is poor.

Description

Technical field: [0001] The invention relates to a preparation method of a crystalline polymer physical foaming material, belonging to the technical field of polymer foaming material production. Background technique: [0002] Polymer foam material refers to a polymer / gas composite material formed by introducing gas into the polymer, usually including foam particles, foam sheets, foam plates, etc. Such materials generally have excellent properties of light weight, heat insulation, shock resistance, cushioning, sound absorption, and energy absorption. Therefore, they are widely used in various fields and have become an important branch of the application and development of polymer materials. [0003] The methods for preparing polymer foam materials in industry are mainly divided into chemical foaming method and physical foaming method. The chemical foaming method is generally to disperse the compound that can decompose and generate gas into the polymer, and let it decompose t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/30C08L23/00C08L67/00
Inventor 李文光吴炳田虞晨阳王亚
Owner 浙江博发新材料股份有限公司
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