Cross-linked polyethylene foam material and preparation method thereof

A technology of cross-linked polyethylene and polyethylene, which is applied in the direction of coating, etc., can solve the problems of large amount of addition, self-adhesive products, and inability to store for a long time, and achieve the effects of high adhesion, pollution reduction, and good biodegradability

Active Publication Date: 2018-03-09
ZHEJIANG WANLI NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Corona treatment is a common method to increase the surface tension of polyethylene foam sheets, but corona requires specific corona equipment and requires a certain amount of energy consumption. Moreover, the surface tension of the foam tape after corona treatment can only be maintained for about 2 weeks , cannot be stored for a long time
Adding ethylene-vinyl acetate copolymer resin (EVA) with polar ester groups is an important method to increase the surface tension of the foam sheet, but the polarity of EVA is weak, so it needs to be added in large quantities, and a large amount of addition will cause serious self-adhesive problems of the product

Method used

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  • Cross-linked polyethylene foam material and preparation method thereof
  • Cross-linked polyethylene foam material and preparation method thereof

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preparation example Construction

[0039] Such as figure 1 Shown, the preparation method of this cross-linked polyethylene foam material may further comprise the steps:

[0040] The present application also provides a preparation method of the above-mentioned cross-linked polyethylene foam material, the preparation method comprising the following steps:

[0041] (1) Polybio-oil polyol synthesis stage: about 100 parts by weight of poly-bio-oil and 1 to 10 parts by weight of the alcohol compound are formed under a nitrogen atmosphere at 150 to 250° C. for 2 to 12 hours through transesterification reaction The described poly bio-oil polyol;

[0042] (2) Polyethylene foam preparation stage: weigh 65-90 parts by weight of polyethylene, 5-30 parts by weight of polybio-oil polyol, 5-30 parts by weight of thermoplastic elastomer, 0.5-7 parts by weight of foaming agent, 0.5 to 4 parts by weight of sensitizer and 0.5 to 5 parts by weight of antioxidant are added to the screw extruder to plasticize and extrude the maste...

Embodiment 1

[0049] Step 1 Synthesis of polypeanut oil polyol

[0050] 100 parts by weight of peanut oil and 0.5 parts by weight of azobisisobutyronitrile were placed in the reactor, stirred and mixed evenly, and then the air in the reactor was replaced by nitrogen gas. In a nitrogen atmosphere, the reactor was heated to 310°C, and peanut oil and azobisisobutyronitrile were polymerized for 8 hours to obtain polypeanut oil;

[0051] Next, 100 parts by weight of poly-peanut oil and 5 parts by weight of glycerin were placed in the reactor for stirring and mixing, and then the air in the reactor was replaced by nitrogen gas. The polypeanut oil polyol was obtained after heating to about 200° C. for transesterification reaction in a nitrogen atmosphere for about 8 hours.

[0052] Step 2 Polyethylene Foam Preparation

[0053] Weigh raw materials according to the following parts by weight:

[0054] 75 parts by weight of low-density polyethylene;

[0055] 10 parts by weight of poly-peanut oil p...

Embodiment 2

[0065] Step 1 Poly-Rapeseed Polyol Synthesis

[0066] 100 parts by weight of rapeseed oil and 0.8 parts by weight of azobisisobutyronitrile were placed in the reactor, stirred and mixed evenly, and then the air in the reactor was replaced by nitrogen gas. In a nitrogen atmosphere, the reactor was heated to 320°C, and rapeseed oil and azobisisobutyronitrile were polymerized for 18 hours to obtain poly-rapeseed oil;

[0067] Next, 100 parts by weight of rapeseed oil and 7 parts by weight of trimethylolpropane were placed in the reactor for stirring and mixing, and then the air in the reactor was replaced by nitrogen gas. After heating to about 220° C. for about 10 hours for transesterification reaction in a nitrogen atmosphere, the poly-rapeed oil polyol was obtained.

[0068] Step 2 Polyethylene Foam Preparation

[0069] Weigh raw materials according to the following parts by weight:

[0070] 70 parts by weight of low-density polyethylene;

[0071] 15 parts by weight of pol...

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Abstract

The invention provides a cross-linked polyethylene foam material. The foam material is prepared from the following materials: 65-90 parts by weight of polyethylene, 5-30 parts by weight of a polybiologicaloilpolyol, 5-30 parts by weight of a thermoplastic elastomer, 0.5-7 parts by weight of a foaming agent, 0.5-4 parts by weight of a sensitizer, and 0.5-5 parts by weight of an antioxidant. According to the invention, the longitudinal tensile strength of the foam material is greater than 3MPa, the longitudinal elongation is greater than 190%, the transverse tensile strength is greater than 1MPa, the transverse elongation is greater than 300%, the 25% compression ratio is 80KPa or less, and the surface tension is 40mN/m or more; and meanwhile the foam material has an apparent density of 0.2-0.5g/cm<3>. The polyethylene foam can be applied to sealing buffer of a view window and a touch screen of an electronic product or a basic material of an adhesive tap.

Description

technical field [0001] The invention relates to a cross-linked polyethylene foam material and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] Radiation cross-linked polyethylene foam is a new type of foamed plastic with a closed-cell structure between soft (polyurethane) and rigid (polystyrene) foams, with superior strength, toughness, elasticity, and flexibility. , Abrasion resistance, chemical corrosion resistance, low temperature resistance and good insulation, etc., can be used as good insulation, heat insulation, shockproof and buoyancy materials, and are widely used in various fields such as industry, agriculture, construction and transportation. Polyethylene foam has fine cells and smooth surface, which is incomparable with any other technology in the production of thin products. [0003] Thin cross-linked polyethylene products can be widely used in industrial double-sided tape core materials, electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L55/00C08L23/16C08K5/098C08K5/134C08J9/10C08J9/36C08F299/00C08F8/00
CPCC08F8/00C08J9/0023C08J9/0061C08J9/103C08J9/105C08J9/107C08J9/36C08J2201/026C08J2201/03C08J2203/04C08J2323/06C08J2409/00C08J2409/06C08J2423/08C08J2423/16C08J2423/22C08J2455/00C08F299/00
Inventor 张轩郭枫梁学正
Owner ZHEJIANG WANLI NEW MATERIALS TECH CO LTD
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