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Preparation method of beta crystal polypropylene/PET (Polyester) alloy

A polypropylene and polypropylene bonding technology, applied in the chemical industry, can solve the problems of β-crystalline polypropylene thermodynamic instability, reduced content of β-crystalline polypropylene, and reduced β-nucleation, and achieve thermodynamic compatibility, impact Increased strength, improved yield strength and modulus

Inactive Publication Date: 2013-04-03
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing method of preparing β-crystalline polypropylene alloy is to adopt a blending method, but the thermodynamic instability of β-crystalline polypropylene, the β-crystalline content of polypropylene in the alloy is affected by the addition of the second component, so that the content of β-crystalline polypropylene in polypropylene significantly reduced or even disappeared. Taking the preparation of polypropylene / PET alloy as an example, when polypropylene and PET are melted and blended at high temperature, due to the polarity of the β-crystal nucleating agent and PET, in the preparation of β-crystal polypropylene / PET alloy During the process, the nucleating agent will migrate to the PET phase or the two-phase interface, which will reduce the β-nucleation effect of the nucleating agent on polypropylene, thereby reducing or even disappearing the content of β-crystalline polypropylene in the alloy.

Method used

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  • Preparation method of beta crystal polypropylene/PET (Polyester) alloy

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Experimental program
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Effect test

Embodiment 1

[0026] Beta crystal nucleating agent, polypropylene, PET, compatibilizer (method two) are mixed uniformly at room temperature to become different test groups by the weight ratio shown in test 1-test 9 in table 1; Used β crystal nucleation The agent is a supported β-crystal nucleating agent prepared by nano-calcium carbonate and pimelic acid, and the weight ratio of the β-crystal nucleating agent to polypropylene is 5:100.

[0027] Among them, different types of compatibilizers were added in Test 2 to Test 5 [respectively EVA-g-MA (ethylene-vinyl acetate copolymer grafted maleic anhydride), POE-g-MA (ethylene-octene copolymer grafted maleic anhydride), maleic anhydride), PP-g-MA (polypropylene grafted maleic anhydride), PP-g-GMA (polypropylene grafted glyceryl methacrylate)], test groups 5-9 were added with different contents of PP-g- GMA.

[0028] Each test group was respectively melt-extruded with a twin-screw extruder at 250° C. at a rotational speed of 30 rpm to obtain a β...

Embodiment 2

[0030] β-crystalline polypropylene, PET and compatibilizer (method 1) were uniformly mixed at room temperature according to the weight ratios shown in Test 10-Test 13 in Table 1 to form different test groups.

[0031] Among them, test 10-test 13 added different types of compatibilizers [respectively EVA-g-MA (ethylene-vinyl acetate copolymer grafted maleic anhydride), POE-g-MA (ethylene-octene copolymer grafted maleic anhydride), maleic anhydride), PP-g-MA (polypropylene grafted maleic anhydride), PP-g-GMA (polypropylene grafted glyceryl methacrylate)].

[0032] Each test group was respectively melt-extruded with a twin-screw extruder at 270° C. at a rotational speed of 50 rpm to obtain a β-crystalline polypropylene / PET alloy.

Embodiment 3

[0034] Make 5 groups of contrasts: with β crystal nucleating agent (loaded type β crystal nucleating agent prepared by nano-calcium carbonate and pimelic acid), polypropylene, PET by the weight ratio shown in contrast 1-contrast 5 in table 1 at room temperature Mixed evenly under lower pressure to become different control groups, all without adding compatibilizer, melt extruded with twin-screw extruder at 250°C, rotating speed 30rpm, to obtain β crystal polypropylene / PET alloy.

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Abstract

The invention belongs to the field of chemical engineering, in particular to a preparation method of a beta crystal polypropylene / PET (Polyester) alloy, which comprises the following steps: mixing beta crystal polypropylene, PET (new material or recovering material) and a compatilizer and carrying out melt extrusion; or mixing a beta crystal nucleating agent, polypropylene, PET (new material or recovering material) and a compatilizer and carrying out melt extrusion. The adopted compatilizer is one or more of ethylene-octene copolymer grafted maleic anhydride, ethylene-vinyl acetate copolymer grafted maleic anhydride, polypropylene grafted maleic anhydride or polypropylene grafted glycidyl methacrylate. By introducing the compatilizer in a certain proportioning range, the crystallization of the PET can be blocked through the chemical reaction and the polarity action of the compatilizer and the PET, so that the nucleating capability of alpha crystal of the PET is reduced, the nucleatingefficiency of beta crystal of the beta crystal nucleating agent is easily improved and the high-content beta crystal polypropylene / PET alloy can be formed; and meanwhile, the invention solves the problems of thermodynamic compatibility of the polypropylene and the PET, the yield strength and low modulus.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a preparation method of a polymer alloy material, in particular to a preparation method of a polypropylene / PET alloy with high β crystal content. Background technique [0002] Polypropylene has a variety of crystal forms, namely α, β, γ, δ and pseudo-hexagonal crystal. Among them, the α crystal form is the most common, and β crystal polypropylene is a new type of polypropylene. In addition to the good comprehensive properties of α crystal polypropylene, compared with α crystal polypropylene, β crystal polypropylene has better impact strength and heat resistance. The deformation temperature is greatly increased, showing higher toughness and ductility under high-speed stretching. [0003] The formation of β-crystalline polypropylene mainly includes three methods: temperature method, shear orientation method and adding nucleating agent. Among them, adding β-crystalline nucleating age...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L67/02C08L51/06C08K13/02C08K3/26C08K5/092C08K5/098B29C47/92B29C48/92
CPCB29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895Y02P70/10
Inventor 麦堪成王春广章自寿
Owner SUN YAT SEN UNIV
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