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A kind of polyolefin resin foam sheet and its manufacturing method

A polyolefin-based resin and foam sheet technology, which is applied in the field of polyolefin-based resin foam sheets, can solve the problem of poor bubble density and compressive strength, poor positive water blocking effect of materials, and foam material cushioning. Performance deterioration and other problems, to achieve the effect of reducing the amount of use, beneficial to positive water blocking, and increasing the foaming temperature

Active Publication Date: 2022-07-19
BASEK ADHESIVE SCI & TECH SUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for polyolefin-based foamed sheets, too high a foaming temperature will lead to too high open porosity, which will eventually lead to poor positive water blocking effect of the material, and reducing the amount of foaming agent used will also lead to Cell density and compressive strength effects become poorer, ultimately resulting in poorer cushioning properties of the foamed material
[0005] It can be seen that for foaming materials, the residual rate of azo foaming agent, porosity, and positive water blocking effect affect each other, and it is difficult for the current foaming materials in the prior art to reduce the azo residue to Under the condition of less than 0.1wt%, it can still have a relatively good positive water blocking effect

Method used

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  • A kind of polyolefin resin foam sheet and its manufacturing method
  • A kind of polyolefin resin foam sheet and its manufacturing method
  • A kind of polyolefin resin foam sheet and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 100 parts by weight of LDPE with MFR of 2g / 10min (trade name: Sinopec 2426H), 5.6 parts by weight of azodicarbonamide, and 0.5 part by weight of antioxidant were mixed in a high-speed mixer, and then kneaded at 130°C, and then Extruded into a strip-shaped sheet, and then irradiated 10Mrad electron beams with an accelerating voltage of 500kV on both sides of the strip-shaped resin sheet to cross-link the resin sheet, and continuously send the cross-linked resin sheet into a heating furnace at 350°C , the heating furnace is heated by an infrared heater to foam the resin sheet, and the foamed resin sheet is blown with room temperature air at the end of the foaming furnace for 5 minutes, so that the surface temperature of the sheet is reduced to below 135 ° C, and then passed through An extrusion roll with a roll surface temperature of 20° C. controls the thickness and simultaneously forms a skin layer. Finally, it was reheated to 120° C., stretched at a draw ratio of 3 tim...

Embodiment 2

[0067] 100 parts by weight of LDPE with MFR of 2g / 10min (trade name: Sinopec 2426H), 3.1 parts by weight of azodicarbonamide, and 0.5 part by weight of antioxidant were mixed in a high-speed mixer, and then kneaded at 130°C, and then Extrude into a strip-shaped sheet, and then irradiate the two sides of the strip-shaped resin sheet with an electron beam of 10 Mrad with an accelerating voltage of 500 kV to cross-link the resin sheet, and continuously send the cross-linked resin sheet into a heating furnace at 215°C , the heating furnace is heated by an infrared heater to foam the resin sheet, and the foamed resin sheet is blown with room temperature air at the end of the foaming furnace for 5 minutes, so that the surface temperature of the sheet is reduced to below 135 ° C, and then passed through An extrusion roll with a roll surface temperature of 20° C. controls the thickness and simultaneously forms a skin layer. Finally, it was reheated to 120° C., stretched at a draw rati...

Embodiment 3

[0069]100 parts by weight of LDPE with MFR of 2g / 10min (trade name: Sinopec 2426H), 6.2 parts by weight of azodicarbonamide, and 0.5 part by weight of antioxidant were mixed in a high-speed mixer, then kneaded at 130°C, and then Extrude into a strip-shaped sheet, and then irradiate the two sides of the strip-shaped resin sheet with an electron beam of 10 Mrad with an accelerating voltage of 500 kV to cross-link the resin sheet, and continuously send the cross-linked resin sheet into a heating furnace at 300°C , the heating furnace is heated by an infrared heater to foam the resin sheet, and the foamed resin sheet is blown with room temperature air at the end of the foaming furnace for 5 minutes, so that the surface temperature of the sheet is reduced to below 135 ° C, and then passed through An extrusion roll with a roll surface temperature of 20° C. controls the thickness and simultaneously forms a skin layer. Finally, it was reheated to 120° C., stretched at a stretching rat...

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Abstract

The invention relates to a polyolefin-based resin foamed sheet with a thickness of 0.04mm-2mm. The foamed sheet comprises at least one skin layer, and the average thickness of a single skin layer accounts for 0.5%-30% of the total thickness. The crust layer is defined as a certain thickness that extends continuously inward from the vertical outer surface of the foamed sheet, and there are no bubbles in this thickness or the volume of bubbles with a pore diameter of 10 μm or less accounts for 98% or more of the total volume of bubbles in the layer. The foamed sheet is conducive to positive water blocking, while taking into account high cushioning performance, to achieve the desired effect of low residual rate of azo foaming agent, positive water blocking and cushioning performance.

Description

technical field [0001] The invention relates to a polyolefin resin foam sheet, which is especially suitable for a waterproof sealing tape for electronic equipment. Background technique [0002] Polyolefin resin foam sheet can still have high shock absorption performance under thin conditions, so it is widely used in electronic equipment such as smart phones, personal computers, electronic paper, etc., and is arranged in electronic components and frame structure parts. Between them, it plays the role of buffer sealing. [0003] In the prior art, an azo-based foaming agent, such as azodicarbonamide (AC foaming agent), is used to foam the polyolefin-based resin substrate, but after foaming, the foaming agent remains. On the one hand, the residual azo-based blowing agent has a negative impact on the mechanical properties of the polyolefin resin foam sheet, and on the other hand, it may cause serious harm to the environment. and Restriction Regulations) explicitly limit its res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L23/08C08L9/00C08J9/10B29C44/34B29C44/20B29L7/00
CPCC08J9/103C08J2203/04C08J2323/06C08J2423/08C08J2409/00C08J2323/08C08J9/36H05K5/06
Inventor 魏琼
Owner BASEK ADHESIVE SCI & TECH SUZHOU CO LTD
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