High-melt strength polypropylene foam material and preparation method thereof

A high melt strength, foaming material technology, applied in the field of polymers, can solve the problem of high cost of polypropylene foaming materials

Active Publication Date: 2013-01-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] U.S. Patent US6251319 (applied on April 30, 1999) discloses a method for preparing polypropylene foam boards, using high melt strength polypropylene resin and volatile and flammable blowing agent butane, and the expansion ratio is 4 -56 times, but due to the use of combustibles as foaming agents, equipment and corresponding workshops must undergo special explosion-proof treatment, so the cost of polypropylene foaming materials is relatively high

Method used

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  • High-melt strength polypropylene foam material and preparation method thereof
  • High-melt strength polypropylene foam material and preparation method thereof
  • High-melt strength polypropylene foam material and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0082] Preparation of High Melt Strength Polypropylene:

[0083] HMSPP101

[0084] The polymerization reaction was carried out on a polypropylene pilot plant. Its main equipment includes prepolymerization reactor, first loop reactor and second loop reactor. Polymerization method and steps are as follows:

[0085] (1) Prepolymerization reaction:

[0086] The main catalyst (titanium-containing solid catalyst active component) is obtained by the method described in Example 1 of Chinese Patent CN93102795, its Ti content: 2.4wt%, Mg content 18.0wt%, di-n-butyl phthalate content: 13wt %.

[0087] The main catalyst, co-catalyst (triethylaluminum), and the first external electron donor (dicyclopentyldimethoxysilane, DCPMS) were pre-contacted at 10°C for 20 minutes, and then continuously added to the pre-polymerization reactor for pre-polymerization. In the polymerization reactor, the pre-polymerization is carried out in the environment of the propylene liquid phase body, the temp...

Embodiment 1～12

[0102]Put the formula amount of high melt strength polypropylene, foaming agent, cell control agent and processing aid into the high-speed mixer and mix at high speed for 1 minute, then add the middle layer twin-screw, the torque is controlled at about 65%, the speed: 10 -170rpm. The processing aids include Antioxidant 1010 (BASF Company), Antioxidant 168 (BASF Company), etc., and the formulation dosage is shown in Table 3. Specific GB / T 1033.1-2008 is used for density measurement, see Table 3.

[0103] table 3

[0104]

[0105]

[0106] ○Smooth or dense cells, × uneven surface or sparse and uneven cells

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Abstract

The invention discloses a high-melt strength polypropylene foam material and a preparation method thereof. The matrix resin of the foam material is high-melt strength polypropylene. The high-melt strength polypropylene foam material has the following characteristics: (1) the melt index (190 DEGC/2.16kg) is 1.0-10g/min; (2) the molecular weight distribution Mw/Mn is 6-20; (3) the content of the molecules with molecular weight over 5 million is greater than or equal to 0.8% by weight; and (4) (Mz+1)/Mn is greater than or equal to 70. The foam material is prepared by premix melting, blending and foaming of the following components in parts by weight: 100 parts of high-melt strength polypropylene and 1-15 parts of foaming agent. The obtained foam material meets the environmental protection requirements of degradability, uniform cell, high physical heat resistance, low production cost and smooth surface, and is suitable for continuous large-scale production.

Description

technical field [0001] The invention relates to the field of macromolecules, in particular to a high-melt-strength polypropylene foam material and a preparation method thereof. Background technique [0002] Polymer foamed plastics mainly include three categories of soft and rigid foamed plastics such as polyurethane, polystyrene and polyethylene. Polyurethane foam is a commonly used foam but is not as easily thermoformable as thermoplastic polymer foams including polypropylene (PP). Expanded polystyrene products have poor resilience, extruded foamed products have high rigidity, are easy to pulverize, and the waste is light in weight, large in size, resistant to aging, corrosion, stable in chemical properties, and not easily degraded by microorganisms. After entering the soil, Deteriorating the soil and treating it with burning will produce carbon dioxide and other harmful gases, which will also cause adverse greenhouse effects and pollute the air. Foamed polyethylene overc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08J9/10C08F110/06C08F4/646C08F2/02
Inventor 郭鹏吕明福张师军杨庆泉徐萌高达利徐凯吕芸陈力
Owner CHINA PETROLEUM & CHEM CORP
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