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Method for preparing new protective film without incohesion

A non-adhesive protective film, a new type of technology, applied in the field of polymers, can solve the problems of difficult adjustment of bonding strength, strong temperature sensitivity, and easy residue generation, and achieve low manufacturing cost, good product quality, and easy lamination. Effect

Inactive Publication Date: 2003-05-07
HONGDA XINGYE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process is relatively complicated, and the solvent volatilizes during the oven drying process, polluting the environment
Some manufacturers also produce PE adhesive-free protective film, which is achieved by adding ethylene-vinyl acetate (EVA) to the raw materials, but its sensitivity to temperature is too strong, and it is easy to produce residues, and the bonding strength is difficult to adjust.

Method used

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  • Method for preparing new protective film without incohesion

Examples

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Embodiment example 1

[0012] A layer formula (weight), LDPE: 25, LLDPE: 75, the melt index is 2, the processing temperature (plasticizing temperature) of LDPE is 10 ℃ lower than that of LLDPE, and the extruder is controlled by low temperature Between 155-185°C, the temperature of the die head is controlled between 150-165°C. If you want to improve the transparency of the new adhesive-free protective film, you can add an inner cooling air ring device at the die head.

[0013] Layer B formula (weight), LDPE: 30, LLDPE: 70, PIB: 15, LDPE, LLDPE and PIB do not contain any additives and slip agents, the melt index is 2, and the processing temperature is close to (+ / -10℃ ), the temperature of the extruder is controlled between 155-185°C. When using a multi-layer extruder with more than three layers, the B layer is set on the outer layer, not the middle layer. The bonding strength of the new adhesive-free protective film can be adjusted by changing the amount of polyisobutylene (PIB).

[0014] After the...

Embodiment example 2

[0016] A layer formula (weight), LDPE: 25, LLDPE: 75, melt index is 2, the processing temperature (plasticizing temperature) LDPE is 10 ℃ lower than LLDPE, the temperature of the extruder is controlled between 155-185 ℃, the mold The temperature of the head is controlled between 150-165°C. If you want to improve the transparency of the new adhesive-free protective film, you can add an inner cooling air ring device at the die.

[0017] B layer formula (weight), LDPE: 30, LLDPE: 70, MLLDPE: 25, LDPE, LLDPE and MLLDPE do not contain any additives and slip agents, the melt index is 2, and the processing temperature is close to (+ / -10℃ ), the temperature of the extruder is controlled between 155-180°C. When using a multi-layer extruder with more than three layers, the B layer is set on the outer layer, not the middle layer. The bonding strength of the new adhesive-free protective film can be adjusted by changing the amount of metallocene linear high-pressure polyethylene (MLLDPE) ...

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Abstract

A non-adhesive protecting film for stainless steel, plastics, etc is prepared from high-pressure polyethylene LDPE, linear high-pressure polyethylene LLDPE, and self-adhesive high-molecular polymer PIB, EVA, or MLLDPE through mixing, coextruding out, blowing film cooling, drawing, stripping, winding and cutting. Its advantages are no volatile solvent, easy sticking and tearing off, and no residual on the protected surface.

Description

technical field [0001] The invention relates to a process for preparing a PE protective film, and belongs to the technical field of polymers. Background technique [0002] The existing PE protective film is mainly a protective film with glue. The PE film base material is produced first, and then a layer of acrylic pressure-sensitive adhesive is coated on the surface of the PE film, and then dried in an oven. This process is relatively complicated, and the solvent volatilizes during the oven drying process, which pollutes the environment. Some manufacturers also produce PE adhesive-free protective film, which is realized by adding ethylene-vinyl acetate (EVA) to the raw materials, but it is too sensitive to temperature, and it is easy to produce residues, and the bonding strength is difficult to adjust. Contents of the invention [0003] The purpose of the present invention is to provide a new type of non-adhesive protective film with simple process, in line with environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C49/04B29D7/01
Inventor 朱传群
Owner HONGDA XINGYE CO LTD
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