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Impact-resistant ultra-thin polyolefin foaming sheet as well as preparation method and application thereof

A polyolefin foaming and foaming sheet technology, which is applied in the direction of film/sheet adhesives, adhesives, etc., can solve the problem of difficulty in ensuring the uniformity of plane thickness, and it is difficult to directly obtain thin foaming sheets and electronic equipment. Stability issues, etc.

Pending Publication Date: 2021-05-11
广德祥源新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for ordinary resin foam sheets, due to their own physical properties during the production process, it is difficult to directly obtain thin foam sheets below 0.6mm. The industry generally adopts die-cutting for processing, but for low thickness It is difficult to ensure the uniformity of the plane thickness of the thin sheet of 0.6mm, which has a significant impact on the stability of electronic equipment; Resin system and cell structure have higher requirements

Method used

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  • Impact-resistant ultra-thin polyolefin foaming sheet as well as preparation method and application thereof

Examples

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preparation example Construction

[0034] The impact-resistant ultra-thin polyolefin foam sheet of the present invention, its preparation method comprises the steps:

[0035] (1) Foaming agent modification

[0036] The foaming agent particles are mixed with fumed silica according to a certain ratio, and fully mixed uniformly in a stirring device to prepare modified foaming agent particles; the ratio of fumed silica to foaming agent particles is preferably 1:10 to 1:99 ;

[0037] (2) Granulation

[0038] Mix the modified foaming agent particles and other additives with polyolefin resin in step (1) and banbury respectively. The temperature of the banbury chamber is 80-180°C, the pressure is 1-2MPa, and the banbury time is 5-25min. Put the resin into a single-screw or twin-screw hopper after kneading, and the processing temperature in the screw barrel is 100-180°C. After extrusion, stranding, pelletizing, and drying processes, the foaming agent resin masterbatch is finally obtained. and antioxidants or other re...

Embodiment 1

[0057] (1) Foaming agent modification: Azodicarbonamide and fumed silica are mixed in a stirring device in a weight ratio of 19:1, and the particle size of the foaming agent after modification is 8 μm, and the weight part is 10 servings.

[0058] (2) Granulation: The obtained modified foaming agent, low-density polyethylene (LDPE) resin, and ethylene-vinyl acetate copolymer (EVA) are mixed and banburyed in a weight ratio of 10:55:35. The bin temperature is 150°C, the pressure is 1.5MPa, and the banburying time is 15min. Put the resin that has been kneaded into agglomerates into the twin-screw hopper, and the processing temperature in the screw barrel is 135°C. , drying process, and finally obtain the modified foaming agent resin masterbatch;

[0059] (3) Extrusion: the remaining resin particles (modified foaming agent masterbatch: LDPE: EVA: color masterbatch = 40:30:27: 3) Extrude into sheets using a twin-screw extruder, select the die opening at the extrusion port to adjus...

Embodiment 2

[0065] The difference from Example 1 is that, in order to obtain a thinner foam sheet, ethylene-propylene rubber (EPR) is added as a resin modifier at the same time. Soft rubber has excellent low-temperature impact resistance, good fluidity and controllable molding shrinkage. It has a greater improvement in tensile deformation and can make thinner foam sheets. The same blowing agent modification process and granulation process as in Example 1, the difference is that the extrusion process formula particle ratio is modified blowing agent master batch: LDPE: EVA: EPR: color master particle=38:25: 13:21:3, select the extrusion die opening to be adjusted to 0.35mm, and extrude the sheet by calendering and cooling to obtain a foamed sheet substrate with a thickness of 0.33mm±0.05mm; the obtained foamed sheet substrate is subjected to high-speed Electron beam irradiation, cross-linking by electron irradiation, the irradiation dose is 25Mrad, to obtain a foam sheet mother sheet; the f...

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Abstract

The invention discloses an impact-resistant ultra-thin polyolefin foaming sheet, which is characterized in that the polyolefin foaming sheet is formed by foaming polyolefin resin, and has an independent cellular structure; fumed silica modified foaming agent particles are used in the foaming process, and the particle size of the modified foaming agent particles is less than 10 microns; the cross-linking degree of the foaming sheet ranges from 30% to 60%, the thickness ranges from 0.03 mm to 0.5 mm, the average foam pore size of the foaming sheet in each direction ranges from 20 micrometers to 100 micrometers, the ratio of the average foam pore size in the MD direction to the foam pore size in the TD direction ranges from 0.8 to 1.2, the foaming ratio ranges from 1.5 times to 6 times, the 25% compression stress is less than or equal to 0.1 MPa, and the impact force absorption is greater than or equal to 60%. The invention further provides a preparation method and application of the impact-resistant ultra-thin polyolefin foaming sheet, the process is simple, the impact-resistant ultra-thin polyolefin foaming sheet is suitable for industrial mass production, and the prepared foaming sheet has the advantages of impact resistance, good waterproofness, softer, lighter and thinner than a common thin film material and the like, and is suitable for being used as a sealing buffer material or an adhesive tape base material of an electronic product.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and more specifically relates to an impact-resistant ultra-thin polyolefin foam sheet and its preparation method and application. Background technique [0002] In recent years, the design of electronic devices such as smartphones, laptops, and LCD TVs is gradually developing towards light, thin, and flexible. The corresponding structural materials, packaging materials, and functional materials must also keep up with product trends. Resin foam sheet is often used as sealing material or buffer material in electronic equipment due to its light weight, thin thickness, heat insulation, moisture resistance, and good physical properties. Adhesive tape based on resin foam sheet can also be used in electronic equipment. It plays a very good buffering and protection role in the bonding of parts in the equipment. In addition, compared with the chemically cross-linked foam sheet, the radiation cro...

Claims

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Application Information

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IPC IPC(8): C08J9/10C08J9/00C08J3/28C08J3/24C08L23/06C08L23/08C09J7/26
CPCC08J9/103C08J9/0061C08J9/0066C08J3/28C08J3/24C09J7/26C08J2323/06C08J2423/08C08J2203/04C08J2205/052C08J2205/044C09J2400/243C09J2423/046Y02A30/00
Inventor 李沛魏琼
Owner 广德祥源新材科技有限公司
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