Four-layer eva polyester composite negative pressure casting film and preparation method

A negative pressure casting, composite technology, applied in the direction of flat products, applications, household appliances, etc., can solve the problems of film damage, roll core sticky and difficult to separate, etc.

Active Publication Date: 2017-06-16
WUHAN HENGDE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the core part of the roll is sticky and difficult to separate, and it is easy to cause film damage during the pulling process.

Method used

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  • Four-layer eva polyester composite negative pressure casting film and preparation method
  • Four-layer eva polyester composite negative pressure casting film and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 89.9kg of EVA polyester with a content of 25% of VA in EVA polyester has a molecular weight of 600,000, 0.02kg of vinyl bis stearamide, 5kg of high-density polyethylene HDPE has a molecular weight of 200,000, and 5kg of low-density polyethylene LDPE has a molecular weight of 200,000 , 0.08kg of oleic acid amide was added to the four mixers according to the materials used for the first layer of film, the second layer of film, the third layer of film, and the fourth layer of film; the first layer of film was added with 5kgHDPE and 5kg of EVA; the second layer of film was added 5kg LDPE and 10kg EVA; add 0.02kg vinyl bis stearamide and 0.98kg EVA to the third layer of film; add the remaining 73.92kg EVA and 0.08kg oleic acid amide to the fourth layer of film; add the above composition to four mixer barrels inside, fully stirred and mixed, sucked into the discharge port of the four extruders through the vacuum suction machine, and moved in the same direction through the four...

Embodiment 2

[0018] The molecular weight of 92.3kg EVA polyester with 25% VA content in EVA polyester is 600,000, 0.05kg vinyl bis stearamide, 4.57kg high density polyethylene HDPE molecular weight is 500,000, 3kg low density polyethylene LDPE molecular weight is 20 Ten thousand, 0.08kg of oleic acid amide was added to the four mixers according to the materials used for the first layer of film, the second layer of film, the third layer of film, and the fourth layer of film; 4.57kg of HDPE and 4.57kg of EVA were added to the first layer of film; The second layer of film adds 3kg LDPE and 6kg EVA; the third layer of film adds 0.05kg vinyl bis stearamide and 2.45kg EVA; the fourth layer of film adds the remaining 79.28kgEVA and 0.08kg of oleic acid amide; Fully stirred and mixed in the four mixer barrels, sucked into the discharge port of the four extruders through the vacuum suction machine, and moved in the same direction through the four extruder units with different length-to-diameter rati...

Embodiment 3

[0020] The molecular weight of 91.1kg EVA polyester with 25% VA content in EVA polyester is 600,000, 0.04kg vinyl bis stearamide, 4.78kg high-density polyethylene HDPE molecular weight is 500,000, 4kg low-density polyethylene LDPE molecular weight is 20 Ten thousand, 0.08kg of oleic acid amide was added to the four mixers according to the materials used for the first layer of film, the second layer of film, the third layer of film, and the fourth layer of film; 4.78kg of HDPE and 4.78kg of EVA were added to the first layer of film; The second layer of film adds 4kg LDPE and 8kg EVA; the third layer of film adds 0.04kg vinyl bis stearamide and 1.96kg EVA; the fourth layer of film adds the remaining 76.36kgEVA and 0.08kg of oleic acid amide; Fully stirred and mixed in the four mixer barrels, sucked into the discharge port of the four extruders through the vacuum suction machine, and moved in the same direction through the four extruder units with different length-to-diameter rati...

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Abstract

The invention relates to a four-layer EVA polyester composite negative pressure casting film and its preparation method. The negative pressure casting film is composed of 89.9%-92.3% EVA polyester, 0.02%-0.05% vinyl bis stearamide, 3-7% Composed of high-density polyethylene HDPE, 3-7% low-density polyethylene LDPE, and 0.08% oleic acid amide, add the above five materials into four mixer barrels according to the materials used for the first layer, second layer, third layer, and fourth layer and stir Mixed, sucked into the four extruder outlets by a vacuum suction machine, and move in the same direction through four extruder units with different length-to-diameter ratios, and converge to the pineapple body in different flow channels in the same die. Under the thrust of the four screws, four kinds of integrated liquefied bodies with different interfaces are formed, which are sprayed out from the die, and then blown, shaped, and cooled by the combined force of internal cooling and external air ring cooling to form four Layer EVA composite negative pressure casting film. The EVA film of the invention can not only meet the elongation requirement of the film for V-method casting, but also ensure the problem of adhesion between films and between films and molds.

Description

technical field [0001] The invention relates to a four-layer EVA polyester composite negative pressure casting film and a preparation method thereof. Background technique [0002] V method molding, also known as vacuum negative pressure molding, or vacuum sealing molding, is a new type of physical molding method for environmental protection dry sand solidification. This process uses a special EVA polyester composite negative pressure casting film to be baked and heated to form a mold on a mold with a vent hole and an air extraction device. After the sand box is covered, fine dry sand is filled in as molding sand, and it is passed through a vibrating table. Vibrating and compacting, scraping and covering the backing film, relying on the vacuum pump to draw out the gas in the mold, resulting in a vacuum in the inner cavity of the sand mold, forming a pressure difference between the inner cavity of the sand mold and the atmospheric pressure, so that the dry sand can be cured wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D7/01C08L23/08C08K5/20C08L23/06
CPCB29D7/01B29D2009/00C08K5/20C08L23/06C08L23/0853C08L2203/16C08L2207/062C08L2207/066
Inventor 刘德汉
Owner WUHAN HENGDE TECH
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