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Cross-linked heat shrinkable film with flame retardant effect and preparation method thereof

A technology of heat shrinkable film and flame retardant, which is applied to other household appliances, etc., can solve the problems of fast burning and poor flame retardant effect of heat shrinkable film, so as to improve the heat shrinkage rate, avoid excessive smoke generation, and achieve good Effect of Heat Shrinkage Properties

Inactive Publication Date: 2019-11-05
GUANGDONG ANDELI NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to propose a cross-linked heat-shrinkable film with flame-retardant effect and its preparation method, aiming to solve the technical problems that the existing heat-shrinkable film has poor flame-retardant effect and burns faster under high temperature conditions

Method used

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  • Cross-linked heat shrinkable film with flame retardant effect and preparation method thereof
  • Cross-linked heat shrinkable film with flame retardant effect and preparation method thereof

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preparation example Construction

[0028] In one embodiment of the present invention, a method for preparing a cross-linked heat-shrinkable film with a flame-retardant effect comprises the following steps:

[0029] Add the raw materials of the outer layer, core layer and inner layer, melt and plasticize them separately, and obtain the compound material through co-extrusion layer;

[0030] The composite material is blown once to obtain a film bubble, and the film bubble is cooled and shaped to form a film tube;

[0031] The membrane tube is pulled to the electron accelerator, and the linear molecular chains of the membrane tube are cross-linked by electron irradiation;

[0032] The cross-linked film tube is preheated and biaxially stretched, and then the film tube is blown twice after biaxial stretching;

[0033] The film tube after secondary inflation is cooled by an air ring and heat-treated, then shaped, trimmed and rolled to obtain the cross-linked heat-shrinkable film with flame-retardant effect.

[0034]...

Embodiment 1

[0051]Add outer layer raw materials: 56% low-density polyethylene, 34% ethylene-octene copolymer, 3% silicone anti-blocking agent, 2% erucamide slip agent, 3% surfactant-type antistatic agent masterbatch, 1% flame retardant (coated red phosphorus 75%, ammonium polyphosphate 25%) and 1% N,N-methylenebisacrylamide crosslinking initiator, core material: 30% Low-density polyethylene, 53% flame retardant (coated red phosphorus 75%, ammonium polyphosphate 25%), 6% erucamide slip agent, 8% N,N-methylene bisacrylamide Co-initiator and 3% surfactant-type antistatic agent masterbatch, inner layer raw materials: 56% low-density polyethylene, 34% ethylene-octene copolymer, 3% silicone anti-blocking agent, 2% Erucamide slip agent, 3% surfactant-type antistatic agent masterbatch, 1% flame retardant (coated red phosphorus 75%, ammonium polyphosphate 25%) and 1% N,N-methylene The bisacrylamide crosslinking initiator is melted and plasticized separately, and the composite material is obtained...

Embodiment 2

[0057] Add outer layer raw materials: 36% low-density polyethylene, 35% ethylene-octene copolymer, 3% diatomaceous earth anti-blocking agent, 1% oleic acid amide slip agent, 2% surfactant type anti-blocking agent Static agent masterbatch, 20% flame retardant (70% aluminum hydroxide, 30% tricresyl phosphate) and 3% diisocyanate crosslinking initiator, core material: 53% low density polyethylene, 30% Flame retardant (70% aluminum hydroxide, 30% tricresyl phosphate), 6% oleic acid amide slip agent, 8% diisocyanate crosslinking initiator and 3% surfactant-type antistatic agent masterbatch , Inner material: 36% low-density polyethylene, 35% ethylene-octene copolymer, 3% diatomaceous earth anti-blocking agent, 1% oleic acid amide slip agent, 2% surfactant anti-blocking agent Static agent masterbatch, 20% flame retardant (70% aluminum hydroxide, 30% tricresyl phosphate) and 3% diisocyanate crosslinking initiator, melt and plasticize respectively, and obtain composite material through...

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Abstract

The invention discloses a preparation method of a cross-linked heat shrinkable film with a flame retardant effect. The method comprises the following steps of: adding raw materials of an outer layer,a core layer and an inner layer, respectively melting and plasticizing, and obtaining a composite material by coextruding the layers; performing primary inflation on the composite material to obtain afilm bubble, and cooling and shaping the film bubble to form a film tube; drawing the film tube to an electron accelerator, and crosslinking linear molecular chains of the film tube through electronirradiation; preheating the cross-linked film tube, carrying out bidirectional stretching, and then carrying out secondary inflation on the film tube; and shaping the film tube subjected to secondaryinflation after being cooled by an air ring and subjected to heat treatment, and obtaining the cross-linked heat shrinkable film with the flame retardant effect by trimming and rolling. An organic flame retardant and an inorganic flame retardant are compounded, so that the flame retardant effect is improved, the defects that the smoke amount of the organic flame retardant is too large in the combustion process and the like are avoided, and the phenomenon that the affinity with the cross-linked heat shrinkable film is poor due to the fact that too much inorganic flame retardant is added, and the processing and mechanical properties are poor is avoided.

Description

technical field [0001] The invention relates to the technical field of heat-shrinkable films, in particular to a cross-linked heat-shrinkable film with a flame-retardant effect and a preparation method thereof. Background technique [0002] Cross-linked heat shrinkable film has good gloss and tear resistance, and is widely used in food, daily necessities, cosmetics and other fields as packaging materials. In addition, heat shrinkable film can also be used as a label to adhere to the container The surface plays the role of introducing product information and brand promotion; at the same time, heat shrinkable film can also be used as a protective film for products in various industrial fields to protect products from pollution and corrosion during transportation, storage and processing. [0003] When the existing heat-shrinkable film is used as a packaging material, when it encounters a fire or other high-temperature conditions, because it does not have a flame-retardant effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/02B29C48/10B29C48/21B29K23/00B29K105/00B29L9/00
CPCB29C69/02B29K2023/04B29K2023/0633B29K2105/0026B29L2009/00B29C48/0017B29C48/0018B29C48/002B29C48/10B29C48/21
Inventor 王丹旭苏阳陈捷新张春生
Owner GUANGDONG ANDELI NEW MATERIALS CO LTD
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