Preparation method of polypropylene resin expanded particle

A polypropylene-based resin and expanded particle technology is applied in the field of polypropylene expanded particles and polypropylene-based resin expanded particles, and can solve the problem of incompatibility between hydrophilic substances and polypropylene, and dispersion of hydrophilic substances. Non-uniformity, poor cell uniformity of expanded particles, etc., to achieve good welding performance, lower heating temperature, and good cell uniformity.

Active Publication Date: 2020-11-03
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve many problems caused by the incompatibility of hydrophilic substances and polypropylene in the existing method for preparing foamed particles by foaming in polypropylene kettles, such as: uneven dispersion of hydrophilic substances, particles The problems of broken strips and poor cell uniformity of expanded particles are easy to occur during preparation. A method for preparing expanded particles using copolymerized polypropylene with hydrophilic structural units as the raw material for kettle-type foaming is proposed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] The preparation method of polypropylene resin expanded particle of the present invention, step is as follows:

[0037] The preparation method of polypropylene-based resin expanded particles, the steps are as follows:

[0038] Put the particles to be expanded into the foaming kettle first, add water and physical foaming agent, heat to above the softening temperature of the particles to be expanded, the pressure in the kettle reaches 0.5-10MPa, keep the temperature and pressure for 0-2h, and finally Released under the pressure of the inner pressure of the bubbler to obtain expanded polypropylene-based resin particles.

[0039] In the present invention, the particles to be expanded are copolymerized polypropylene particles or composite particles containing hydrophilic structural units, the particles to be expanded do not react with water below the melting temperature, and the expanded particles can be prepared by a foaming tank.

[0040] Composite particles are composed o...

Embodiment 1

[0051] Add the graft polymer of homopolypropylene-polyoxyethylene ether (the content of polyoxyethylene ether is 15wt%) into the twin-screw extruder, extrude and granulate to obtain the particles to be expanded, and put the particles to be expanded into high pressure In the foaming kettle, add water and stir, pass in carbon dioxide as a foaming agent, keep the pressure at 5MPa, raise the temperature to 150°C, quickly open the discharge valve of the high-pressure foaming kettle, release the pressure to normal pressure, and obtain polypropylene foamed particles .

[0052] After testing, the expanded particle density is 45kg / m 3 , uniform cells.

[0053] The foamed particles are molded by steam molding in a mould, the welding performance is good, the steam temperature is 144-152°C, the width of the molding heating temperature is 8°C, and the obtained product is beautiful and plump.

Embodiment 2

[0055] The graft polymer of polypropylene-vinyl acetate (vinyl acetate content is 40wt%), water-absorbing additive glyceryl stearate and nucleating agent silicon dioxide are added into twin-screw extruder according to mass ratio 100:10:1, Extrude and granulate to make particles to be expanded, put the particles to be expanded into a high-pressure foaming kettle, add water and stir, feed butane as a foaming agent, keep the pressure at 2.0MPa, heat up to 125°C, and open quickly The discharge valve of the high-pressure foaming kettle is used to release the pressure to normal pressure to obtain expanded polypropylene particles.

[0056] After testing, the foamed particle density is 50kg / m 3 , uniform cells.

[0057] The foamed particles are molded by steam molding in a mould, and the welding performance is good, the steam temperature is 120-128°C, and the width of the molding heating temperature is 8°C, and the product is beautiful and plump.

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Abstract

The invention provides a preparation method of polypropylene type resin foaming particles and belongs to the technical field of foaming materials. The problem is solved that in an existing polypropylene kettle-type foaming particle foam-preparing method, a hydrotropic substance is incompatible with polypropylene, so that the hydrotropic substance is ununiform in dispersion, a strip breakage phenomenon is likely to occur during particle preparation and foaming particles are poor in foam pore uniformity. The method comprises the steps that particles to be foamed are put in a foaming kettle, water and a physical foaming agent are added, heating is performed to make the foaming particles higher than softening temperature and the pressure in the kettle up to 0.5-10 MPa, heat preservation is performed, and then releasing is performed under the pressure lower than the inner pressure in the foaming kettle to obtain the polypropylene type resin foaming particles, wherein the particles to be foamed are composite particles of co-polypropylene particles containing hydrophilic structure units or co-polypropylene containing hydrophilic structure units and additives. By adopting the method, the dispersity of the hydrotropic substance in a system is improved, the forming temperature of the foaming particles is reduced, and the prepared foaming particles are good in foam pore uniformity.

Description

technical field [0001] The invention belongs to the technical field of foaming materials, and in particular relates to a preparation method of polypropylene-based resin foamed particles, and is especially suitable for preparing polypropylene foamed particles used in steam molding in a mold to produce foamed products. Background technique [0002] Various shapes of PP foam products produced by polypropylene (PP) resin foam particles through steam molding in the mold have been developed rapidly in recent years, and are mainly used in thermal insulation materials, cushioning packaging materials, automotive interior components, automotive insurance, etc. Bar core material and so on. With the continuous development of the market, people have put forward more requirements for steam-formed products in the mold of polypropylene-based resin foam particles. [0003] On the one hand, the polypropylene-based resin foam particles should have uniform appearance particle diameter and inte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/18C08J9/232C08J9/12C08J9/14C08L51/08C08L51/06C08L51/02C08L23/12C08L67/04
CPCC08J9/0023C08J9/0066C08J9/122C08J9/141C08J9/18C08J9/232C08J2203/06C08J2203/14C08J2323/12C08J2351/02C08J2351/06C08J2351/08C08J2451/06C08J2451/08C08J2467/04
Inventor 唐涛李明罡姜治伟邢海平邱健樊东蕾
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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