Preparation method for thermoplastic polyurethane elastomer foaming material

A thermoplastic polyurethane and foaming material technology, applied in the field of thermoplastic polyurethane elastomer and foaming materials, can solve the problems of poor foaming effect, cavitation structure, TPU monomer falling off, etc., and achieve good bead density consistency, The material structure is stable and the effect of increasing the bonding force

Inactive Publication Date: 2017-07-18
XIFENG 2D FUJIAN MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the batch molding technology is to put the preformed semi-finished product into the autoclave, and inject the inert gas or supercritical fluid under a certain pressure and temperature, and then quickly raise the temperature or lower the pressure after reaching the equilibrium of diffusion and dissolution to make the saturated gas nucleate and expand, shape and form. The obtained microcellular foam material; this method is by physical foaming, because there is no stable bond formed between TPU and TPU, the foaming effect is not good
The injection molding process generally mixes the injected foaming agent with the polymer melt uniformly through the mixing element of the screw head device, and then releases the gas after heating the foaming agent to decompose, and forms fine pores in the polymer composition; Chemical foaming is prone to uneven foaming due to dispersion problems and is difficult to control. Chemical foaming agents can also cause coarse cells and cavitation structure problems
If it is made into a shoe sole, there will be gaps between TPU particles and particles, and the TPU monomer around the gap may fall off and damage the overall structure

Method used

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  • Preparation method for thermoplastic polyurethane elastomer foaming material
  • Preparation method for thermoplastic polyurethane elastomer foaming material

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preparation example Construction

[0020] The method for preparing a thermoplastic polyurethane elastomer foam material disclosed in the present invention includes the steps:

[0021] (1) 100 parts by weight of thermoplastic polyurethane elastic material, 0.5-10 parts of graphene material and 0.05-3 parts of lubricant are stirred and mixed to obtain a mixture; the obtained mixture is melted and mixed, and after cooling, it is cut through The pelletizer cuts pellets to obtain thermoplastic polyurethane pellets uniformly doped with graphene;

[0022] (2) Add the pellets and water obtained in step (1) to a mass ratio of 1:0.3-1:5, and add them to the reactor to start stirring;

[0023] (3) Pour carbon dioxide or nitrogen gas into the reactor to control the pressure and temperature in the reactor so that the carbon dioxide or nitrogen gas in the reactor is in a supercritical state;

[0024] (4) Heat the reaction kettle to dissolve supercritical carbon dioxide or nitrogen in the thermoplastic polyurethane uniformly doped wi...

Embodiment 1

[0029] First put 100 parts of thermoplastic polyurethane elastomer, 3 parts of graphene and 0.5 parts of lubricant into a high-speed mixer for mixing for 10 minutes; then add the evenly mixed mixture into the twin-screw extruder for melting and mixing, the screw speed is 150rpm, Mixing at 135°C for 20 minutes; then extruded by a twin screw, cooled in a water tank, and introduced into a pelletizer for pelletizing operation to obtain thermoplastic polyurethane pellets uniformly doped with graphene;

[0030] Then, the obtained thermoplastic polyurethane pellets and water were added to the reactor at a mass ratio of 1:1 to start stirring; carbon dioxide and nitrogen were introduced into the reactor, and the pressure in the reactor was controlled to 7.5MPa and the temperature at 45°C to make the reactor Carbon dioxide and nitrogen are in a supercritical state; heat the reactor to dissolve supercritical carbon dioxide or nitrogen in the thermoplastic polyurethane uniformly doped with gr...

Embodiment 2

[0033] First put 100 parts of thermoplastic polyurethane elastomer, 1 part of graphene oxide and 0.5 parts of lubricant into a high-speed mixer for mixing for 20 minutes; then add the evenly mixed mixture into the twin-screw extruder for melting and mixing, the screw speed is 150rpm , Mixing at 135°C for 30 minutes; then extruded by a twin screw and cooled in a water tank, then introduced into a pelletizer for pelletizing operation to obtain thermoplastic polyurethane pellets uniformly doped with graphene;

[0034] Then, the obtained thermoplastic polyurethane pellets and water were added to the reactor at a mass ratio of 1:0.8 to start stirring; carbon dioxide and nitrogen were introduced into the reactor, and the pressure in the reactor was controlled to 7.5MPa and the temperature at 50°C to make the reactor Carbon dioxide and nitrogen are in a supercritical state; heat the reactor to dissolve supercritical carbon dioxide or nitrogen in the thermoplastic polyurethane uniformly d...

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Abstract

The invention discloses a preparation method for a thermoplastic polyurethane elastomer foaming material. The method comprises the following steps: (1) stirring and mixing 100 parts of TPU material, 0.5-10 parts of graphene material and 0.05-3 parts of lubricating agent, thereby acquiring a mixture; (2) adding the aggregates acquired in the step (1) and water into a reaction kettle and starting to stir; (3) introducing carbon dioxide or / and nitrogen into the reaction kettle, controlling the pressure and temperature in the reaction kettle and keeping the carbon dioxide or / and nitrogen in the reaction kettle under a super-critical state; (4) heating the reaction kettle and dissolving the super-critical carbon dioxide or / and nitrogen in thermoplastic polyurethane with uniformly doped graphene under the temperature of the reaction kettle; (5) continuously adding a foaming agent, a cross-linking agent, a lubricating agent and cross-linking auxiliaries into the reaction kettle, continuously stirring for 1-5h, and then connecting the reaction kettle with a pressure tank and enabling the materials in the reaction kettle to enter into the pressure tank under the pressure effect; and (6) foaming the materials in the pressure tank for 30-90min, and then reducing the pressure and reducing the temperature to below 70 DEG C, thereby acquiring the TPU foaming material.

Description

Technical field [0001] The invention relates to the field of thermoplastic polyurethane elastomers and foamed materials, in particular to a method for preparing thermoplastic polyurethane elastomer foams. Background technique [0002] Thermoplastic polyurethane elastomer, TPU, is a new type of organic polymer synthetic material, and it is the most ideal material to replace PVC and PU. It is called a new polymer material internationally. Polyurethane thermoplastic elastomer not only has excellent physical and mechanical properties (high modulus, high strength, high elongation, high elasticity, good toughness) and good processing characteristics, but also has low temperature flexibility, abrasion resistance, oil resistance, and air permeability , Transparency, and can be recycled for secondary processing. Therefore, TPU is widely used in automotive, wire and cable, adhesive, medical, shoe materials, toys, apparel, pipes, rollers, aviation and other industries. [0003] Due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/30C08J9/12C08J9/06C08L75/04C08K3/04
CPCC08J9/30C08J9/06C08J9/122C08J2203/06C08J2203/08C08J2203/204C08J2375/04C08K3/04C08L2203/14C08L2207/04
Inventor 吴丽清江婉萍
Owner XIFENG 2D FUJIAN MATERIAL TECH CO LTD
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