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Waterproof paper bag and preparation method thereof

A paper bag and dilute sulfuric acid technology, which is applied in paper, papermaking, textiles and papermaking, etc., can solve the problems of paper food bag rupture, water damage, poor mechanical properties, etc.

Active Publication Date: 2015-09-16
TONGLING FOUNDER PLASTICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Plastic food bags have excellent mechanical properties, anti-corrosion and waterproof characteristics, but plastic food bags are difficult to decompose, and they do not meet the current concept of environmental protection; and paper food bags fully meet the requirements of environmental protection due to their excellent degradability , so it can be widely used
[0003] Although paper food bags have excellent degradability, the mechanical properties of food bags are poorer than those of plastic food bags, especially the waterproof performance, which leads to the cracking and water damage of paper food bags during use occurrence, which greatly limits further promotion and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The invention provides a preparation method of a waterproof paper bag, comprising:

[0015] 1) gelatinizing dilute sulfuric acid and starch to make starch solution;

[0016] 2) steaming the starch solution to obtain a paste;

[0017] 3) Glycerin, salicylic acid, ethanol, rosin, film-forming aid, lignocellulose, nano-palladium, silicon latex, magnesium oxide, surfactant and paste are mixed to prepare a waterproof coating;

[0018] 4) Applying the waterproof coating to the surface of the paper bag body to make a waterproof paper bag.

[0019] In step 1), the specific amount of each substance can be selected in a wide range, but for the gelatinization of starch in dilute sulfuric acid more quickly, preferably, relative to the starch of 100 parts by weight, the amount of dilute sulfuric acid is 2- 4 parts by weight. Wherein, the specific concentration of the dilute sulfuric acid can be selected within a wide range, but in order to further optimize the gelatinization effe...

Embodiment 1

[0030] 1) At 25° C., gelatinize dilute sulfuric acid (containing 4% by weight of sulfuric acid) and starch for 40 minutes to prepare a starch solution; wherein the weight ratio of dilute sulfuric acid to starch is 100:3.

[0031] 2) Cooking the starch solution for 3 hours at 75°C to prepare a paste;

[0032] 3) At 25°C, mix the above paste, glycerin, salicylic acid, ethanol, rosin, propylene glycol butyl ether, lignocellulose, nano-palladium (20nm particle size), silica latex, magnesium oxide and dodecyl Sodium benzenesulfonate (the weight ratio of each substance is 100:3:4:1:0.8:2.5:1.2:0.06:1.5:1.7:6) was mixed for 30 minutes to prepare a waterproof coating;

[0033] 4) Apply the above-mentioned waterproof paint to the surface of the paper bag body (with a thickness of 0.1 mm) to prepare a waterproof paper bag A1.

Embodiment 2

[0035] 1) At 15° C., gelatinize dilute sulfuric acid (containing 2% by weight of sulfuric acid) and starch for 30 minutes to prepare a starch solution; wherein the weight ratio of dilute sulfuric acid to starch is 100:2.

[0036] 2) Cook the starch solution for 2 hours at 70°C to prepare a paste;

[0037] 3) At 15°C, mix the above paste, glycerin, salicylic acid, ethanol, rosin, propylene glycol methyl ether acetate, lignocellulose, nano palladium (particle size is 10nm), silicon latex, magnesium oxide and stearin salt (the weight ratio of each substance is 100:1:2:0.5:0.5:1.5:0.7:0.05:0.8:1.5:4) mixed for 20 minutes to prepare a waterproof coating;

[0038] 4) Apply the above-mentioned waterproof paint to the surface of the paper bag body (with a thickness of 0.1mm) to prepare a waterproof paper bag A2.

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Abstract

The present invention discloses a waterproof bag and a preparation method thereof, the preparation method comprises the following steps: 1) dilute sulfuric acid and starch are gelatinized to form a starch solution; 2) the starch solution is steamed and cooked to obtain a paste; 3) glycerol, salicylic acid, ethanol, rosin, a film forming assistant, wood cellulose, nano Pd, silicon emulsion, magnesium oxide, a surfactant and the paste are mixed to prepare a waterproof coating; and 4) the paper bag body surface is coated with the waterproof coating by brushing to obtain the waterproof paper bag. The waterproof paper obtained by the method has excellent mechanical properties and water resistance.

Description

technical field [0001] The invention relates to coatings, in particular to a waterproof paper bag and a preparation method thereof. Background technique [0002] Food bags are bags used to hold food, which are divided in terms of materials, including paper food bags and plastic food bags. Plastic food bags have excellent mechanical properties, anti-corrosion and waterproof characteristics, but plastic food bags are difficult to decompose, and they do not meet the current concept of environmental protection; and paper food bags fully meet the requirements of environmental protection due to their excellent degradability , so it can be widely used. [0003] Although paper food bags have excellent degradability, the mechanical properties of food bags are poorer than those of plastic food bags, especially the waterproof performance, which leads to the cracking and water damage of paper food bags during use The occurrence of the disease greatly limits further promotion and use. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/28D21H17/65D21H17/63D21H17/62D21H17/20
Inventor 陈可夏陈可亮
Owner TONGLING FOUNDER PLASTICS TECH