Halogen-Free Flame-Retardant Polyolefin Composite Foam Material And Preparation Method Thereof

Patent metadata

Field	Value
Publication number	US-2016304691-A1
Application number	US-201415100944-A
Country	US
Kind code	A1
Filing date	Dec 24, 2014
Priority date	Mar 6, 2014
Publication date	Oct 20, 2016
Grant date	—

Abstract

This present invention discloses a halogen-free flame retardant polyolefin foam composite, which is comprises: 80-125 parts by weight of ethylene/vinyl acetate copolymer (EVA), 8-13 parts by weight of high density polyethylene (HDPE) or low density polyethylene (LDPE), 15-25 parts by weight of polyolefin elastomer (POE), 60-77 parts by weight of acid source material, 17-22 parts by weight of carbon source material, 8-11 parts by weight of gas source material, 1-8 parts by weight of retardant synergist, 5.5-8 parts by weight of composite foaming agent, 0.7-1.0 parts by weight of crosslinking agent, 4.0-5.5 parts by weight of plasticizer, 0.5-1.6 parts by weight of surface treatment agent, 20-35 parts by weight of compatibility, 6-14 parts by weight of inorganic filler, and 1.6-4.6 parts by weight of additive. This halogen-free flame retardant polyolefin foam composite has the advantages of good softness, flexibility, impact resistance, low density, low compressibility and deformability, good shock absorbability, and so on.

First claim

What is claimed is:

1 . A halogen-free flame retardant polyolefin foam composite comprising:
80-125 parts by weight of ethylene/vinyl acetate copolymer (EVA), 8-13 parts by weight of high density polyethylene (HDPE) or low density polyethylene (LDPE), 15-25 parts by weight of polyolefin elastomer (POE), 60-77 parts by weight of acid source material, 17-22 parts by weight of carbon source material, 8-11 parts by weight of gas source material, 1-8 parts by weight of retardant synergist, 5.5-8 parts by weight of composite foaming agent, 0.7-1.0 parts by weight of crosslinking agent, 4.0-5.5 parts by weight of plasticizer, 0.5-1.6 parts by weight of surface treatment agent, 20-35 parts by weight of compatibility, 6-14 parts by weight of inorganic filler, and 1.6-4.6 parts by weight of additive.

2 . The composite as claimed in claim 1 , wherein the POE comprises one or more of the following materials: ethylene-octene copolymer, ethylene-styrene copolymer, ethylene-propylene-styrene block copolymer, phenyl ethyl-ethylene/butene-styrene copolymer, and styrene-isoprene-styrene copolymer.

3 . The composite as claimed in claim 1 , wherein
the acid source material comprises one or more of the following materials: Ammonium polyphosphate, ammonium polyphosphate, phosphoric acid, boric acid, and borate; the carbon source material comprises one or more of the following materials: corn starch, tapioca starch, potato starch and mung bean starch; the gas source material comprises one or more of the following materials: melamine, carbonic foaming agent and urea; and the retardant synergist comprises one or more of the following materials: aluminum hydroxide, hexahydroxy zinc stannate, organic montmorillonite, and zinc borate.

4 . The composite as claimed in claim 1 , wherein the composite foaming agent comprises one or more of the following materials: azobisformamide, azodiisobutyronitrile, sodium bicarbonate, 1,3-benzene sulfonyl hydrazide, and p-toluene sulfonyl hydrazine;
wherein dicumyl peroxide is used as crosslinking agent; and the plasticizer comprising two or more of the following materials: glycerin, citric acid, ethanol, and polyvinyl alcohol.

5 . The composite as claimed in claim 1 , wherein the surface treatment agent comprises one or more of the following materials: silane coupling agent, titanate coupling agent, titanium phosphate ester coupling agent, and aluminum composite coupling agent;
wherein the compatibility comprises one or more of the following materials: ethylene-acrylic acid, maleic anhydride grafted HDPE, methyl methacrylate and butyl acrylate copolymer; and the inorganic filler comprising one or more of the following materials: talcum powder, bentonite, and kaolin.

6 . The composite as claimed in claim 1 , wherein the additive is compounded of 0.1-0.6 parts by weight of stearic acid, 0.5-1.0 parts by weight of zinc stearate, and 1-3 parts by weight of zinc oxide.

7 . A process for preparing a halogen-free flame retardant polyolefin foam composite as claimed in claim 1 , comprising the steps of:
Step 1: mixing the acid source material with the surface treatment agent, stirring the mixture for 3-5 minutes at high agitation speed, then drying the mixture for 8-10 hours under the temperature between 40-60° C.; Step 2: mixing the carbon source material with the plasticizer, stirring the mixture for 5-15 minutes at high agitation speed, and then packing the mixture with a sealed bag for 24-48 hours; Step 3: mixing the acid source material obtained from Step 1 well with the carbon source material obtained from Step 2, then adding gas source material to the mixture, stirring the mixture well, and then packing the mixture with a sealed bag to obtain composite flame retardant; Step 4: adding the EVA, HDPE or LDPE, and POE to a mixer, preheating the mixture for 5-8 minutes, then adding the composite flame retardant obtained from Step 3, retardant synergist, composite foaming agent, crosslinking agent, compatibility, inorganic filler, and additive to the mixer, melting and blending the mixture for 10-15 minutes under the temperature between 90-120° C.; Step 5: quickly moving the mixture obtained from Step 4 into an open mixing machine, molding the mixture for 3-5 times under the temperature between 78-85° C., then crushing the mixture; Step 6: weighing the mixture obtained from Step 5, adding it to a preheated mould, curing and foaming the mixture for 8-10 minutes by a plate vulcanizing machine under the temperature between 160-175° C. and a pressure of 10-13 MPa.

Assignees

• Univ Fuzhou

Inventors

• Zheng Yuying
• Chen Zhijie

Classifications

• C08J2423/08

  Copolymers of ethene (C08J2423/16 takes precedence) · CPC title

• C08J2423/06

  Polyethene · CPC title

• C08J2331/04

  Homopolymers or copolymers of vinyl acetate · CPC title

• C08J9/0095

  Mixtures of at least two compounding ingredients belonging to different one-dot groups · CPC title

• C08J9/0061 Primary

  characterized by the use of several polymeric components · CPC title