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Polylactic acid waterproof coating material, preparation method and molded paper pulp

A technology of waterproof coating and pulp molding, applied in the direction of polyester coating, coating, paper coating, etc., can solve the problems of weak waterproof ability, achieve good waterproof effect and simple process

Pending Publication Date: 2021-11-05
MYS GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a polylactic acid waterproof coating material, preparation method and pulp molding, aiming to solve the problem of weak waterproof ability of existing packaging waterproof materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The present invention also provides a method for preparing a polylactic acid waterproof coating material, said method comprising the following steps: preparing an organic solvent, taking 50ml of ethyl acetate and 50ml of absolute ethanol, mixing them into a magnetic stirrer at room temperature and fully stirring for 2min. Prepare a mixed solvent; prepare a polylactic acid solution, slowly add 10 g of polylactic acid into the prepared organic solvent, continue stirring for 30 minutes until the polylactic acid is fully dissolved, and prepare a polylactic acid waterproof coating material.

[0021] Preferably, the absolute ethanol and ethyl acetate are replaced by N,N-dimethylformamide, and the method includes the following steps: preparing an organic solvent, taking 100ml of N,N-dimethylformamide and placing it in a ventilation experiment Under the environment of a Taiwan exhaust hood; prepare a polylactic acid solution, take 10g of polylactic acid and slowly add it to the ...

Embodiment 1

[0027] (1) Preparation of organic solvent: Take 50ml of ethyl acetate and 50ml of absolute ethanol (1:1 of absolute ethanol and ethyl acetate), mix them into a magnetic stirrer at room temperature and stir for 2 minutes to prepare a mixed solvent;

[0028] (2) Preparation of polylactic acid solution: Take 10g of polylactic acid (solvent: solute 1:10) and slowly add it to the prepared organic solvent, and continue stirring for 30 minutes until the polylactic acid is fully dissolved to prepare a polylactic acid solution;

[0029] (3) Pulp molding surface pretreatment: melt the carnauba wax and coat it on the formed pulp molding surface, the dosage is 15g / m 2 Stand to cool, increase the smoothness of the pulp molding surface, and fill the fiber voids;

[0030] (4) Polylactic acid is dried to form a film: the prepared polylactic acid solution is 15g / m 2 The dosage of the same method is used to cover the surface of the prepared pulp molding, and finally it is left to dry naturally...

Embodiment 2

[0033] (1) Preparation of organic solvent: Take 100ml of N,N dimethylformamide and place it in the environment of the exhaust cabinet of the ventilation experiment bench;

[0034] (2) Preparation of polylactic acid solution: Take 10g of polylactic acid (solvent: solute 1:10) and slowly add the prepared organic solvent while stirring, and continue stirring for 5 minutes until the polylactic acid is fully dissolved to prepare a polylactic acid solution;

[0035] (3) Pulp molding surface pretreatment: melt the carnauba wax and coat it on the formed pulp molding surface, the dosage is 15g / m 2 Stand to cool, increase the smoothness of the pulp molding surface, and fill the fiber voids;

[0036] (4) Polylactic acid is dried to form a film: the prepared polylactic acid solution is 15g / m 2 The dosage of the same method is used to cover the surface of the prepared pulp molding, and finally it is left to dry naturally. After the polylactic acid is formed into a film, the pulp molding c...

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PUM

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Abstract

The invention provides a polylactic acid waterproof coating material, a preparation method and molded paper pulp. The waterproof coating material comprises the following components by weight percentage: 40-45.5% of absolute ethyl alcohol, 40-45.5% of ethyl acetate and 9-20% of polylactic acid. The waterproof material is laminated on the surface of the molded paper pulp, the process is simple, the dosage of the waterproof material is much less than that of a waterproof agent added during pulping, meanwhile, the waterproof effect is better, a wax layer sprayed in advance not only has certain waterproof performance, but also can fill part of micropores in the molded surface of the paper pulp, the binding property between the polylactic acid and the molded paper pulp is improved, and the dosage is reduced.

Description

technical field [0001] The invention belongs to the field of packaging materials, and in particular relates to a polylactic acid waterproof coating material, a preparation method and pulp molding. Background technique [0002] In order to improve the waterproof performance of pulp molding, the main method at present is to add a waterproof agent during the beating process, and its main components are stearate, paraffin, rosin gum and the like. In addition, because the above ingredients are easy to gradually migrate and lose during use, retention aids are generally added. The main component is polyacrylamide, and the above stearate and polyacrylamide are toxic to a certain extent, so the amount of addition should not be too much. Contents of the invention [0003] The object of the present invention is to provide a polylactic acid waterproof coating material, a preparation method and pulp molding, aiming to solve the problem of weak waterproof ability of the existing packag...

Claims

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Application Information

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IPC IPC(8): D21H19/14D21H19/28D21H19/10D21H17/60D21H19/82D21H21/16C09D167/04
CPCD21H19/14D21H19/28D21H19/10D21H17/60D21H19/824D21H21/16C09D167/04
Inventor 刘恺邢大平
Owner MYS GRP CO LTD