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Propylene-ethylene-butylene high-melt-strength polypropylene foamed board or sheet and preparation method thereof

A high-melt-strength, foamed sheet technology, applied in the field of polymers, can solve the problems of increasing low-molecular random substances, high n-hexane extracts, and limited application range, etc., to achieve effective expansion of the foaming window and self-skinning Smooth, process-friendly effect

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ethylene content in the low molecular weight part of ethylene propylene random copolymerized polypropylene is often too high, thereby increasing the content of low molecular random substances in the product, resulting in a high n-hexane extract of the product, which limits its application range, especially Is the field of food hygiene packaging

Method used

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  • Propylene-ethylene-butylene high-melt-strength polypropylene foamed board or sheet and preparation method thereof
  • Propylene-ethylene-butylene high-melt-strength polypropylene foamed board or sheet and preparation method thereof
  • Propylene-ethylene-butylene high-melt-strength polypropylene foamed board or sheet and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0028] Preparation of matrix resin HMSPP401

[0029] The polymerization reaction was carried out on a polypropylene pilot plant. Its main equipment includes prepolymerization reactor, first loop reactor and second loop reactor.

[0030] Pre-polymerization reaction: the main catalyst (titanium-containing solid catalyst active component) is obtained by the method described in Example 1 of Chinese patent CN93102795, the Ti content is 2.4wt%, the Mg content is 18.0wt%, and the di-n-phthalic acid The butyl ester content is 13 wt%. The main catalyst, co-catalyst (triethylaluminum), and the first external electron donor (dicyclopentyldimethoxysilane, DCPMS) are 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 bulk, the temperature is 15°C, and the residence time is about 4 minutes. Under this...

Embodiment 1~10

[0042] Put 100 parts by weight of high melt strength polypropylene HMSPP401 or HMSPP402, foaming agent (azodicarbonamide, namely industrial grade AC foaming agent), cell control agent (talcum powder) and additives into a high-speed mixer at high speed After mixing for 1 minute, add the middle layer twin-screw, the torque is controlled at about 65%, and the speed is 10-170rpm. Among them, the additives include acid absorbing agent calcium stearate, antioxidant (calcium stearate with a weight ratio of 1:2:2, BASF antioxidant 1010 and antioxidant 168 compounded, accounting for 0.2 parts by weight in total) and Lubricant MB50-002 (high molecular weight polysiloxane), the weight parts of cell control agent, foaming agent and lubricant are shown in Table 3; the foaming temperature and the density of the product sheet are shown in Table 3, using specific GB / T1033 .1-2008 for density measurements. Examples 1~3 and 6~10 use high melt strength polypropylene HMSPP401, and Examples 4~5 u...

Embodiment 11

[0044] The remaining steps are the same as in Examples 1-10, and the specific data are shown in Table 3; only the blowing agent is changed from azodicarbonamide to 5 parts by weight of dinitrosopentamethylenetetramine.

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Abstract

The invention provides a polypropylene foamed board or sheet. The foamed board or sheet is prepared by foaming a base resin high-melt-strength polypropylene with a foaming agent, wherein the high-melt-strength polypropylene has the following characteristics: the melt index MFR is 0.2-10 g / 10 minutes, the molecular weight distribution Mw / Mn is 6-20, the content of substances with the molecular weight of greater than 5 million is greater than or equal to 0.8 wt%, the M[z+1] / Mn is greater than or equal to 70, the ethylene content is 0.1-15 wt%, and the butylene content is 0.1-15 wt%. The high-melt-strength polypropylene with wide molecular weight distribution is utilized as the raw material to implement stabilization of the polypropylene raw material, so that the foaming window is effectively enlarged, and the technique is easy to adjust; the method can be used for preparing the polypropylene foamed board or sheet with the density of 0.2-0.9 g / cm<3> and the thickness of 0.1-400mm, which has the advantages of smooth surface crust, uniform pore diameter and close cell hard structure; and the polypropylene foamed board or sheet can be widely used in the fields of thermal insulation tableware, automobile interior ornaments, architectural moldboards, camping supplies, decorating material interlayers, product damping packages and the like.

Description

technical field [0001] The invention relates to the field of macromolecules, in particular to a propylene-ethylene-butylene copolymerized high-melt-strength polypropylene foam board or sheet and a preparation method thereof. Background technique [0002] Foamed materials mainly include foamed beads, foamed plates or sheets and other apparent forms; foamed plates or sheets are widely used in containers, building materials, auto parts and impact energy absorbing materials. Compared with polystyrene foam board or sheet, polypropylene (PP) foam board or sheet has excellent rigidity and thermal stability, and the demand for it has been increasing in recent years. Polypropylene foamed boards and sheets are mainly obtained by extrusion foaming. Specifically, the mixing and melting of the foaming components are directly completed in the extruder, and the foaming is completed by decomposing and overflowing the foaming agent at the machine head. bubble process. [0003] In particula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08J9/10C08F210/16C08F4/646
CPCC08F210/06C08F210/16C08J9/103C08J9/105C08J9/107C08J2203/04C08J2205/052C08J2323/14C08L23/14C08L2201/06C08L2201/08C08L2203/14C08F210/02C08F210/08C08F2500/04C08F2500/11C08F4/6465
Inventor 郭鹏吕明福张师军刘有鹏邹浩宋文波吕芸
Owner CHINA PETROLEUM & CHEM CORP
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