Waterproof paper pulp molding material with high compressive strength and preparation method thereof

A technology of pulp molding and compressive strength, applied in papermaking, paper, reinforcing agent addition, etc., can solve the problems of whiteness effect of finished products, limited binding force, increased cost, etc., to improve retention and drainage, The effect of improving compressive performance and enhancing compressive strength

Active Publication Date: 2021-06-15
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still the following problems in pulp molding materials at present, which limit its further application:
[0004]1. The existing pulp molding materials have insufficient compressive strength
[0005] Due to the use of secondary pulp fibers in current pulp molding materials, the bonding force is limited, the mechanical strength is low, and the pressure-bearing performance is poor
In order to improve the compressive strength of pulp molding materials, virgin pulp (wood pulp, bamboo pulp, bagasse pulp, etc.) is directly used to improve the quality of the material, which increases the cost and is not environmentally friendly
[0006]2. Insufficient whiteness and firmness affect the visual appearance of pulp molding materials
[0007] When the existing pulp molding materials use waste corrugated cardboard scraps, waste newspapers, book paper, wheat straw and various plant residues as secondary fiber raw materials, although Most of the impurities are removed during the beating process, but the residual pigment will still affect the whiteness of the finished product
In addition, during the manufacturing process, most of the water is removed from the product by drying and pressing, but subject to the requirement to keep the fiber from being taken away by excessive adsorption pressure, the compactness is still not high, and the overall flatness is still insufficient, which affects Visual effect
[0008]3. Insufficient water and moisture resistance, which limits its further application
Although this method effectively improves the waterproof performance of pulp molded products, spraying increases the cost of surface treatment, and the coating is non-degradable, which pollutes the environment

Method used

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  • Waterproof paper pulp molding material with high compressive strength and preparation method thereof
  • Waterproof paper pulp molding material with high compressive strength and preparation method thereof
  • Waterproof paper pulp molding material with high compressive strength and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment provides a preparation method of a degradable water repellent, and the preparation steps include:

[0036] S1. Preparation of glyceryl polypropylene oxide polyether polyol

[0037] Put the initiator (sucrose, glycerin) and catalyst (the molar ratio of sucrose and glycerin is 1:0.95~1, and the catalyst is 1%~1.5% of the mass of the initiator) into the polymerization tank, and replace the air with nitrogen for 3~5 After three times, heat to 110-120°C, vacuumize while stirring, let the sucrose, glycerin and catalyst react completely, and the reaction time is 1-1.2h. Use a high-pressure pump to add propylene oxide, and control the dripping rate of propylene oxide to 3-6L / min to maintain the polymerization pressure at 0.3-0.5MPa and the polymerization temperature at 110-120°C. After adding propylene oxide, keep the temperature constant , continue to react in the reactor until the pressure is negative pressure, stop the reaction. Transfer the product obtaine...

Embodiment 2

[0043] This example provides a method for preparing a degradable modified reinforcing filler. The preparation steps include:

[0044] S1. Nano CaCO 3 modified

[0045] Weigh 5kg nano-CaCO 3 Put it into a reaction kettle, add 50L of distilled water, stir in a constant temperature water bath and heat to 80°C. Add 85L of water into the reaction kettle, and configure the modifier according to the stearic acid: sodium laurate mass ratio of 1:1, and slowly add it into the above reaction kettle after fully dissolving, and heat to 90°C, and stir for 1 hour to obtain Nano-CaCO 3 modified suspension.

[0046] S2. Chitosan-coated modified nano-CaCO 3

[0047] nanoCaCO 3 Modified suspension, cooled to 70°C, added CaCO 3 Adipic acid solution with a mass of 100-120%, stirred for 1 hour, filtered, washed to remove unreacted adipic acid, redispersed in distilled water, added dropwise to chitosan solution with a concentration of 5%, reacted, filtered, fully washed , dried, and ground ...

Embodiment 3

[0049] This embodiment provides a method for preparing a high compressive strength, waterproof pulp molding material, and the preparation steps include:

[0050] S1. Cut waste corrugated paper, waste coated paper, and straw with a shredder, mix them according to the mass ratio of waste corrugated paper, waste coated paper, and straw at a ratio of 1:0.3:1.8, soak, beat, and filter to obtain filter residue, which is washed with water for 3 to 5 After the second time, it is added into water to make a waste paper pulp suspension with a solid content of 13%.

[0051] S2. Pump the waste paper pulp suspension to the 2 o 2 The first bleaching treatment tank, after stirring for 30 minutes, pumped to the second bleaching treatment tank containing formamidine sulfinic acid, steam 90 ° C, kept stirring for 30 minutes, then pumped to the third bleaching treatment tank containing sodium borohydride, steam 60 ℃, keep stirring for 60min.

[0052] S3. Pump the bleached waste paper pulp susp...

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Abstract

The invention discloses a waterproof paper pulp molding material with high compressive strength. The waterproof paper pulp molding material is prepared from the following raw materials: waste paper pulp suspension, chitosan modified filler, a degradable waterproof agent and a retention aid. According to the preparation method disclosed by the invention, a degradable polyether type waterborne polyurethane prepolymer and polydimethylsiloxane are creatively cross-linked and formed at a baking stage to serve as a degradable waterproof agent, so that a waterproof layer on the surface of a paper pulp molded product is degradable. According to the invention, the chitosan-coated modified nanofiller is effectively dispersed in the waste paper pulp suspension, and the natural hydrophilic colloid of the retention aid has a special polyhydroxy structure, so that the compression resistance, degradability, water resistance and moisture resistance of the paper pulp molding material are improved.

Description

technical field [0001] The invention relates to the technical field of pulp molding, in particular to a high compressive strength, waterproof pulp molding material and a preparation method thereof. Background technique [0002] Pulp molding material (paper plastic) is a packaging material obtained by using primary fiber or secondary fiber as the main raw material, dehydrating the fiber with a special mold, and then drying and shaping it. Paper plastic has the advantages of cheap and easy-to-obtain raw materials, no pollution in the production process, good shock resistance, cushioning, air permeability, anti-static performance, recyclable and easy degradation, etc., so it has a broad application in the packaging fields of electronic materials, daily chemical products, fresh products, etc. Application prospects. [0003] Paper plastic has been developed in our country for more than 30 years, and great progress has been made, especially in disposable environmental protection ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21J5/00D21H11/14D21H21/14D21H21/10D21H21/32D21H21/52D21H17/68D21H17/67D21H17/00D21H17/57D21H17/59D21H21/18
CPCD21J5/00D21H11/14D21H21/14D21H21/10D21H21/32D21H21/52D21H17/68D21H17/675D21H17/00D21H17/57D21H17/59D21H21/18
Inventor 段华伟于文喜
Owner HUNAN UNIV OF TECH
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