Method for preparing release regenerated cellulose membrane

A regenerated cellulose film and release technology, applied in the direction of coating, etc., can solve the problems that the thermoplastic composite layer is difficult to degrade, the release film is not resistant to high temperature, and the price is high, so as to achieve high temperature resistant tensile strength, intact protection, Excellent release effect

Active Publication Date: 2013-07-31
SHANDONG HENGLIAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The release film based on plastic films such as polyester (PET), biaxially oriented polypropylene (BOPP) and polyethylene (PE) depends on petroleum resources. Therefore, this paper-plastic composite food packaging paper has two defects. First of all, petrochemical resources are facing the state of over-exploitation, and the regeneration speed of this resource is slow, so it faces the trend of resource depletion. Secondly, the thermoplastic composite layer of the packaging paper used is difficult to degrade, so it causes great pollution to the environment. , so the use of degradable and easily renewable materials has become a problem in the use of food packaging paper. In addition, the low temperature resistance of the release film of this type of substrate also limits its application in certain fields; The application of optical density paper (glassine paper) is restricted to varying degrees because of its high price

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Select cotton pulp with a weight ratio of 40% and wood pulp with a weight ratio of 60% to make viscose through alkalization, pressing, aging, yellowing, dissolving, ripening, filtering and defoaming, and then viscose Viscose metering pump is pumped into the film forming machine, and the film is formed by the forming machine; the film is put into the desulfurization tank for desulfurization; after desulfurization, it is transferred to the bleaching tank for bleaching; after bleaching, it is washed with water.

[0017] (2) Put the washed film into the plasticizing tank, immerse it in the plasticizing solution, and plasticize for 6 seconds at a temperature of 58°C and a pH value of 8.89. The plasticizing solution is a mixed solution composed of the following raw materials: triethylene glycol aqueous solution with a concentration of 62g / L, the dosage is 145kg / ton film, and silica sol aqueous solution with a silica content of 13g / L, the dosage is 10.2 kg / ton film .

[0...

Embodiment 2

[0023] (1) Select cotton pulp with a weight ratio of 35% and wood pulp with a weight ratio of 65% to make viscose through alkalization, pressing, aging, yellowing, dissolving, ripening, filtering and defoaming, and then viscose Viscose metering pump is pumped into the film forming machine, and the film is formed by the forming machine; the film is put into the desulfurization tank for desulfurization; after desulfurization, it is transferred to the bleaching tank for bleaching; after bleaching, it is washed with water.

[0024] (2) Put the washed film into the plasticizing tank, immerse it in the plasticizing solution, and plasticize it for 8 seconds at a temperature of 55°C and a pH value of 8.85. The plasticizing solution is a mixed solution composed of the following raw materials: triethylene glycol aqueous solution with a concentration of 72g / L, the dosage is 150kg / ton film, and silica sol aqueous solution with a silicon dioxide content of 14g / L, the dosage is 11 kg / ton fil...

Embodiment 3

[0030] (1) Select cotton pulp with a weight ratio of 41% and wood pulp with a weight ratio of 59% to make viscose through alkalization, pressing, aging, yellowing, dissolving, ripening, filtering and defoaming, and then viscose Viscose metering pump is pumped into the film forming machine, and the film is formed by the forming machine; the film is put into the desulfurization tank for desulfurization; after desulfurization, it is transferred to the bleaching tank for bleaching; after bleaching, it is washed with water.

[0031] (2) Put the washed film into the plasticizing tank, immerse it in the plasticizing solution, and plasticize for 8 seconds at a temperature of 60°C and a pH value of 9.12. The plasticizing solution is a mixed solution composed of the following raw materials: triethylene glycol aqueous solution with a concentration of 68g / L, the dosage is 150kg / ton film, and silica sol aqueous solution with a silica content of 14g / L, the dosage is 12 kg / ton film .

[003...

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Abstract

The invention discloses a method for preparing a release regenerated cellulose membrane, which comprises the following steps: selecting raw material, preparing an adhesive, regenerating fibers, desulfurizing, bleaching, plasticizing, drying for regulating moisture content and coating, wherein the plasticizing is a technical process to immerse the membrane in plasticizing liquid; the coating is tofill a paint in a paint tank when the temperature of a drying channel of a preheating coating machine reaches a temperature required by a process and allow the membrane to pass through the coating machine; and the paint comprises a release agent, a cross-linking agent and methylbenzene. The release regenerated cellulose membrane prepared by the method is degradable, meets an environment-protection requirement and has the advantages of high release effect, no toxin or odor, high temperature resistance and high tensile resistance.

Description

technical field [0001] The invention relates to a preparation method of a release-type regenerated cellulose film. Background technique [0002] In recent years, the application of release film has developed rapidly and the technology has become increasingly mature. However, under the current background of environmental protection and conservation, its prospects are worrying. At present, the substrates used for release paper or release film mainly include paper and plastic film. The commonly used substrates in industry include PE, polyester, polypropylene or polyethylene film composite paper and super calendered density paper (Gra Xin paper). The release film based on plastic films such as polyester (PET), biaxially oriented polypropylene (BOPP) and polyethylene (PE) depends on petroleum resources. Therefore, this paper-plastic composite food packaging paper has two defects. First of all, petrochemical resources are facing the state of over-exploitation, and the regenerati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/12C08J7/04C08J7/00C08J5/18C08L1/24
Inventor 王新许丽丽王慧君陈玉苹杨同仙
Owner SHANDONG HENGLIAN NEW MATERIALS CO LTD
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