CN114622446A

CN114622446A - Paper pulp molding product and preparation method thereof

Info

Publication number: CN114622446A
Application number: CN202011435567.3A
Authority: CN
Inventors: 江成真; 李世明; 高绍丰
Original assignee: Jinan Shengquan Group Share Holding Co Ltd
Current assignee: Jinan Shengquan Group Share Holding Co Ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2022-06-14

Abstract

The application discloses a paper pulp molded product and a preparation method thereof, and the preparation method of the paper pulp molded product comprises the following steps: (1) mixing and stirring paper pulp and a chemical additive to obtain slurry, wherein the concentration of the slurry is 0.3% -0.8%; (2) under the conditions that the vacuum degree is-0.05-0.08 Mpa and the mechanical pressure is 0-300 t, placing the slurry into a forming mold in a slurry suction or grouting mode, and dehydrating the slurry to obtain a wet blank with the water content of 45-80%; (3) and transferring the wet blank into a heat setting mold, and drying and setting under the conditions that the temperature is 120-250 ℃, the vacuum degree is-0.05-0.08 Mpa and the mechanical pressure is 0-100 t to obtain a dry blank, wherein the water content of the dry blank is 0-8%. The fibers with different lengths are reasonably proportioned, so that the strength among the fibers is increased, and a product with the hardness and the stiffness meeting the requirements is obtained; the method has the advantages of environment-friendly raw materials, easy degradation and no environmental pollution; the whole production process flow has zero emission and can realize closed-loop recycling.

Description

Paper pulp molding product and preparation method thereof

Technical Field

The application relates to comprehensive utilization of biomass, in particular to a pulp molding product and a preparation method thereof.

Background

At present, plastic products are widely applied, but white pollution caused by abuse of plastics is more serious, and plastic particles are generated due to long degradation time, so that the environment is polluted. And the plastic dosage is increased day by day, but the recovery difficulty is high, the environment-friendly treatment is difficult to carry out, and the sustainable economic form development with circulation, low carbon and environmental protection is not met.

Disclosure of Invention

Based on the above, the application discloses an environment-friendly and economical pulp molded product and a preparation method thereof, wherein the pulp molded product can replace part of plastic products, and the pollution to the environment is reduced.

The invention provides a preparation method of a pulp molded product, which comprises the following steps: (1) mixing and stirring paper pulp and a chemical additive to obtain slurry, wherein the concentration of the slurry is 0.3% -0.8%; (2) under the conditions that the vacuum degree is-0.05-0.08 Mpa and the mechanical pressure is 0-300 t, placing the slurry into a forming mold in a slurry suction or grouting mode, and dehydrating the slurry to obtain a wet blank with the water content of 45-80%; (3) and transferring the wet blank into a heat setting mold, and drying and setting under the conditions that the temperature is 120-250 ℃, the vacuum degree is-0.05-0.08 Mpa and the mechanical pressure is 0-100 t to obtain a dry blank, wherein the water content of the dry blank is 0-8%.

Specifically, the slurry concentration refers to the content of the total dry weight of the slurry in the slurry.

Further, the preparation method further comprises the following steps:

surface spraying or roller coating: and (3) spraying a PLA (polylactic acid) coating film on the surface of the wet blank and/or the dry blank or rolling the chemical auxiliary agent.

Preferably, the pulp is selected from one or more of chemical pulp, chemi-mechanical pulp and mechanical pulp; wherein, the chemical pulp, the chemi-mechanical pulp and the mechanical pulp can be compounded according to any proportion. The chemical auxiliary agent is selected from one or more of oil-proof agent, waterproof agent, moisture-proof agent, flame retardant, antifouling agent, non-wood fiber material and other acceptable chemical additives, and other natural plant fibers.

Further, the paper pulp comprises 0-100 parts of the chemical pulp, 0-100 parts of the chemi-mechanical pulp and 0-100 parts of the mechanical pulp by weight of oven-dried pulp.

Preferably, the paper pulp comprises 30-70 parts of the chemical pulp, 20-50 parts of the chemi-mechanical pulp and 25-55 parts of the mechanical pulp by weight of oven dry pulp.

Preferably, the paper pulp comprises 40-60 parts of the chemical pulp, 25-35 parts of the chemi-mechanical pulp and 35-45 parts of the mechanical pulp.

The invention also provides a pulp molded product prepared by the preparation method.

Further, the paper pulp molding product is mainly prepared from 80-100 parts of the paper pulp and 0-20 parts of chemical additives by weight of oven-dried pulp.

Preferably, the paper pulp molding product is mainly prepared from 90-100 parts of the paper pulp, 0-1 part of the oil-proofing agent and 0-1 part of the water-proofing agent by weight of oven-dried pulp.

Preferably, the paper pulp molding product is mainly prepared from 82-89 parts of the paper pulp, 1-2 parts of the oil-proof agent, 1-1.5 parts of the waterproof agent, 2-2.5 parts of the moisture-proof agent, 3-4 parts of the flame retardant and 5-10 parts of the non-wood fiber material by weight of absolute dry pulp.

Specifically, the oil-repellent agent is selected from Japan gold; the waterproof agent is selected from Kemira AKD; the moisture-proof agent is selected from nitrolacquer moisture-proof agents; the flame retardant is selected from additive flame retardants; the antifouling agent is selected from environment-friendly efficient CPC; the non-wood fiber material is selected from reed.

Further, the dry blank is subjected to edge cutting and shaping to obtain a product, and the dryness of the product needs to be more than 92%.

Further, the pulp molded product may be a tableware or the like for holding food.

Further, the pulp molded product may be a product for building interior ceiling, wall paper, or the like.

The preparation method of the pulp molding product provided by the invention obtains the fibers with different lengths by adopting different pulping modes for natural plant raw materials, and reasonably matches the fibers with different lengths, so that the strength among the fibers is increased, and the product with the hardness and stiffness meeting the requirements is obtained; the method has the advantages of environment-friendly raw materials, easy degradation and no environmental pollution; the whole production process flow has zero emission and can realize closed-loop recycling.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without exceeding the protection scope of the present application.

FIG. 1 is a flow chart of a process for producing a pulp molded product according to an embodiment of the present invention

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The application takes natural plant fiber as a raw material, and the fibrous material, namely paper pulp, is prepared by different pulping modes. And can be classified into chemical pulp, mechanical pulp, and chemimechanical pulp according to the processing method.

The chemical pulp is a pulp obtained by chemically dissociating plant fibers, and the fibers are slender and strong, and have excellent folding strength, breaking strength and tearing strength.

The mechanical pulp is paper pulp made by mechanically grinding and decomposing fiber raw materials, and has short fiber, high content of non-cellulose components and low strength of finished products.

Chemi-mechanical pulp is paper pulp made by chemical pretreatment and mechanical defibering post-treatment. The wood chips are first lightly pretreated (macerated or cooked) with a pharmaceutical agent to remove a portion of the hemicellulose from the wood chips, with less or substantially no lignin dissolved out, but softening the intercellular layer. And then the wood chips (or grass chips) are ground and softened by a disc grinder so as to separate the fibers into paper pulp. Chemi-mechanical pulp generally contains a higher lignin and cellulose component and a lower hemicellulose component. The physical strength is between that of chemical pulp and mechanical pulp, and the finished product has very good stiffness.

The natural plant fiber material can be selected from wood, bamboo, reed, cotton, hemp, grass, etc.

FIG. 1 is a flow chart showing the production of a pulp molded product according to an embodiment of the present invention. The preparation method of the pulp molding product comprises the following steps:

(1) chemical pulp, chemimechanical pulp and mechanical pulp made of natural plant fibers are mixed in proportion to prepare paper pulp. Mixing and stirring the paper pulp and the chemical auxiliary agent to obtain the pulp with the pulp concentration of 0.3-0.8%.

Further, the paper pulp comprises 0-100 parts of chemical pulp, 0-100 parts of chemi-mechanical pulp and 0-100 parts of mechanical pulp.

Further, the paper pulp comprises 30-70 parts of chemical pulp, 20-50 parts of chemi-mechanical pulp and 35-55 parts of mechanical pulp.

Further, the paper pulp comprises 40-60 parts of chemical pulp, 25-35 parts of chemi-mechanical pulp and 35-45 parts of mechanical pulp.

Further, the chemical additives include oil-proofing agents, water-proofing agents, moisture-proofing agents, flame retardants, stain-proofing agents, non-wood fiber materials, and other acceptable chemical additives.

Further, the oil-proof agent is selected from TG8811, AG-E860 and other products.

Further, the water repellent is selected from AKD, acrylate, and the like.

Further, the moisture-proof agent is selected from nitrocellulose lacquer moisture-proof agent, perchloroethylene lacquer moisture-proof agent and the like.

Further, the flame retardant is selected from a nitrolacquer moisture-proof agent, a perchloroethylene lacquer moisture-proof agent and the like.

Further, the antifouling agent is selected from an environment-friendly efficient CPC antifouling agent and the like.

Further, the non-wood fiber material is selected from reed, straw, corn stalk, bagasse, etc.

(2) Placing the slurry into a forming die in a slurry sucking or injecting mode under the conditions that the vacuum degree is-0.05-0.08 Mpa and the auxiliary oil pressure or air pressure and mechanical pressure are 0-300 t, and then dehydrating the slurry to obtain a wet blank with the water content of 60-70%.

(3) And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of temperature of 120-250 ℃, vacuum degree of-0.05-0.08 Mpa and auxiliary oil pressure or air pressure and mechanical pressure of 30-300 t to obtain a dry blank with the water content of 0-8%.

Further, the preparation method also comprises the following steps of surface spraying or roller coating: and spraying PLA coating films on the surfaces of the wet blanks and/or the dry blanks or rolling the wet blanks and/or the dry blanks to increase the strength or performance indexes. The sequence of the steps can be flexibly adjusted according to the type of the auxiliary agent, between the steps (2) and (3) and after the step (3).

Further, the preparation method also comprises the following steps of trimming and shaping: the trimming and shaping are realized under the pressure of 0-100 t, and all types of trimming are included.

Further, the paper pulp molding product is mainly prepared from 80-100 parts of paper pulp and 0-20 parts of chemical additives by weight of oven-dried pulp.

Further, the paper pulp molding product is mainly prepared from 90-100 parts of paper pulp, 0-1 part of oil-proof agent and 0-1 part of water-proof agent by weight of oven-dried pulp.

Further, the paper pulp molding product is mainly prepared from 82-89 parts of paper pulp, 1-2 parts of an oil-proofing agent, 1-1.5 parts of a waterproof agent, 2-2.5 parts of a moisture-proofing agent, 3-4 parts of a flame retardant and 5-10 parts of a non-wood fiber material by weight of absolute dry pulp.

Example 1

And taking 40 parts of chemical pulp, 25 parts of chemical mechanical pulp and 35 parts of mechanical pulp to prepare paper pulp. 99 parts of paper pulp, 0.5 part of oil-proofing agent and 0.5 part of waterproofing agent are mixed and stirred to obtain the pulp with the pulp concentration of 0.3 percent.

Under the conditions of vacuum degree of-0.08 MPa, auxiliary oil pressure or air pressure and mechanical pressure of 300t, placing the slurry into a forming mould by using a slurry sucking or grouting mode, and then dehydrating the slurry to obtain a wet blank with the water content of 80%.

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of temperature of 120 ℃, vacuum degree of-0.08 Mpa and auxiliary oil pressure or air pressure and mechanical pressure of 60t to obtain a dry blank with the water content of 8%. And spraying or rolling the surface of the product, and trimming and shaping to obtain the product.

Through detection, the product has the data of size deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load bearing performance, compression resistance, box cover folding test, drop test, delivery moisture and the like.

The detection method comprises the following steps: GB/T36787 and 2018 pulp molding tableware

Example 2

Taking 10 parts of chemical pulp, 60 parts of chemimechanical pulp and 40 parts of mechanical pulp to prepare paper pulp. 95 parts of paper pulp, 0.1 part of oil-proofing agent and 0.1 part of waterproofing agent are mixed and stirred to obtain the pulp with the pulp concentration of 0.5 percent.

Under the conditions of vacuum degree of-0.05 Mpa, auxiliary oil pressure or air pressure and mechanical pressure of 50t, placing the slurry into a forming mould by using a slurry sucking or grouting mode, and then dehydrating the slurry to obtain a wet blank with the water content of 59%.

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of 180 ℃, vacuum degree of-0.05 Mpa and auxiliary oil pressure or air pressure and mechanical pressure of 50t to obtain a dry blank with the water content of 6 percent. The product (tableware, wallboard, ceiling, work bag, etc.) is obtained after surface spraying or roller coating and trimming and shaping.

Through detection, the product has the advantages of size deviation, capacity deviation, water leakage, temperature resistance, cup body stiffness, load bearing performance, compression resistance, box cover folding test, drop test, delivery moisture and the like.

Example 3

And taking 20 parts of chemical pulp, 10 parts of chemical mechanical pulp and 70 parts of mechanical pulp to prepare paper pulp. 98 parts of paper pulp, 1 part of oil-proofing agent and 1 part of waterproofing agent are mixed and stirred to obtain slurry with the concentration of 0.8 percent.

Under the conditions of vacuum degree of-0.02 Mpa, auxiliary oil pressure or air pressure and mechanical pressure of 30t, placing the slurry into a forming mould by using a slurry sucking or grouting mode, and then dehydrating the slurry to obtain a wet blank with the water content of 49%.

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of 250 ℃, vacuum degree of-0.02 Mpa and auxiliary oil pressure or air pressure and mechanical pressure of 60t to obtain a dry blank with the water content of 2%. The product (tableware, wallboard, ceiling, work bag, etc.) is obtained after surface spraying or roller coating and trimming and shaping.

Example 4

99 parts of chemical paper pulp, 0.5 part of oil-proofing agent and 0.5 part of waterproofing agent are mixed and stirred to obtain the pulp with the pulp concentration of 0.3 percent.

Under the conditions of vacuum degree of-0.05 Mpa, auxiliary oil pressure or air pressure and mechanical pressure of 30t, placing the slurry into a forming mould by using a slurry sucking or grouting mode, and then dehydrating the slurry to obtain a wet blank with the water content of 70%.

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of 50 ℃, vacuum degree of-0.05 Mpa and auxiliary oil pressure or air pressure and mechanical pressure of 60t to obtain a dry blank with the water content of 7%. The product (tableware, wallboard, ceiling, work bag, etc.) is obtained after surface spraying or roller coating and trimming and shaping.

Example 5

79 parts of chemical pulp, 20 parts of chemi-mechanical pulp, 0.5 part of oil-proofing agent and 0.5 part of waterproofing agent are mixed and stirred to obtain the pulp with the pulp concentration of 0.3%.

Example 6

79 parts of chemical paper pulp, 20 parts of mechanical pulp, 0.5 part of oil-proofing agent and 0.5 part of waterproofing agent are mixed and stirred to obtain the pulp with the pulp concentration of 0.3 percent.

Example 7

95 parts of chemical-mechanical pulp, 1 part of oil-proofing agent, 1 part of waterproofing agent, 1 part of moisture-proofing agent, 1 part of flame retardant and 1 part of antifouling agent are mixed and stirred to obtain the slurry with the slurry concentration of 1%.

Under the conditions of vacuum degree of-0.05 Mpa, auxiliary oil pressure or air pressure and mechanical pressure of 60t, placing the slurry into a forming mould by using a slurry sucking or grouting mode, and then dehydrating the slurry to obtain a wet blank with the water content of 70%.

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of 50 ℃, vacuum degree of-0.05 Mpa and auxiliary oil pressure or air pressure and mechanical pressure of 60t to obtain a dry blank with the water content of 7%. And spraying or rolling the surface of the wall plate, trimming and shaping to obtain the product (the wall plate, the ceiling, the work bag and the like).

Through detection, the product has the advantages of size deviation, water leakage, temperature resistance, delivery moisture and the like.

Example 8

95 parts of mechanical paper pulp, 1 part of oil-proof agent, 1 part of waterproof agent, 1 part of moisture-proof agent, 1 part of flame retardant and 1 part of antifouling agent are mixed and stirred to obtain the slurry with the slurry concentration of 1%.

Example 9

Taking 70 parts of chemical pulp and 30 parts of chemi-mechanical pulp to prepare paper pulp, and mixing and stirring 98 parts of paper pulp, 1 part of oil-proofing agent and 1 part of waterproofing agent to obtain the pulp with the pulp concentration of 0.3%.

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of 50 ℃ of temperature, 0.05Mpa of vacuum degree and 50t of auxiliary oil pressure or air pressure and mechanical pressure to obtain a dry blank with the water content of 7%. The product (tableware, wallboard, ceiling, work bag, etc.) is obtained after surface spraying or roller coating and trimming and shaping.

Example 10

Taking 70 parts of chemical pulp and 30 parts of mechanical pulp to prepare paper pulp, and mixing and stirring 98 parts of paper pulp, 1 part of oil-proofing agent and 1 part of waterproofing agent to obtain the pulp with the pulp concentration of 0.3%.

Example 11

Taking 70 parts of chemi-mechanical pulp and 30 parts of mechanical pulp to prepare paper pulp, mixing and stirring 95 parts of paper pulp with 1 part of oil-proof agent, 1 part of waterproof agent, 1 part of moisture-proof agent, 1 part of flame retardant and 1 part of antifouling agent to obtain the pulp with the pulp concentration of 1%.

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of 50 ℃ of temperature, 0.05Mpa of vacuum degree and 50t of auxiliary oil pressure or air pressure and mechanical pressure to obtain a dry blank with the water content of 7%. And spraying or rolling the surface of the wall plate, trimming and shaping to obtain the product (the wall plate, the ceiling, the work bag and the like).

Comparative example 1

98 parts of chemical pulp, 1 part of oil-proofing agent and 1 part of waterproofing agent are mixed and stirred to obtain pulp with the concentration of 0.8 percent.

Under the conditions of vacuum degree of-0.02 Mpa, auxiliary oil pressure or air pressure and mechanical pressure of 30t, placing the slurry into a forming mould by using a slurry sucking or grouting mode, and then dehydrating the slurry to obtain a wet blank with the water content of 60%.

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of temperature of 60 ℃, vacuum degree of-0.02 Mpa and auxiliary oil pressure or air pressure and mechanical pressure of 60t to obtain a dry blank with the water content of 2%. And spraying or rolling the surface of the product, and trimming and shaping to obtain the product.

Comparative example 2

95 parts of chemi-mechanical pulp, 0.1 part of oil-proofing agent and 0.1 part of waterproofing agent are mixed and stirred to obtain the pulp with the concentration of 5%.

Under the conditions of vacuum degree of-0.05 Mpa, auxiliary oil pressure or air pressure and mechanical pressure of 50t, placing the slurry into a forming mould by using a slurry sucking or grouting mode, and then dehydrating the slurry to obtain a wet blank with the water content of 65%.

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of 180 ℃, vacuum degree of-0.05 Mpa and auxiliary oil pressure or air pressure and mechanical pressure of 50t to obtain a dry blank with the water content of 6%. And spraying or rolling the surface of the product, and trimming and shaping to obtain the product.

Comparative example 3

90 parts of mechanical pulp, 0.5 part of oil-proofing agent and 0.5 part of waterproofing agent are mixed and stirred to obtain the pulp with the pulp concentration of 0.3 percent.

Under the conditions of vacuum degree of-0.08 Mpa, auxiliary oil pressure or air pressure and mechanical pressure of 300t, placing the slurry into a forming die in a slurry sucking or grouting manner, and then dehydrating the slurry to obtain a wet blank with the water content of 70%.

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of temperature of 110 ℃, vacuum degree of-0.08 Mpa and auxiliary oil pressure or air pressure and mechanical pressure of 60t to obtain a dry blank with the water content of 8%. And spraying or rolling the surface of the product, and trimming and shaping to obtain the product.

Comparative example 4

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of 50 ℃, vacuum degree of-0.05 Mpa and auxiliary oil pressure or air pressure and mechanical pressure of 10t to obtain a dry blank with the water content of 7%. The product (tableware, wallboard, ceiling, work bag, etc.) is obtained after surface spraying or roller coating and trimming and shaping.

Comparative example 5

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of 50 ℃, vacuum degree of-0.05 Mpa and auxiliary oil pressure or air pressure and mechanical pressure of 20t to obtain a dry blank with the water content of 7%. And spraying or rolling the surface of the wall plate, trimming and shaping to obtain the product (the wall plate, the ceiling, the work bag and the like).

Comparative example 6

Under the conditions of vacuum degree of-0.03 MPa, auxiliary oil pressure or air pressure and mechanical pressure of 60t, placing the slurry into a forming mould by using a slurry sucking or grouting mode, and then dehydrating the slurry to obtain a wet blank with the water content of 70%.

Comparative example 7

Under the conditions of vacuum degree of-0.03 Mpa, auxiliary oil pressure or air pressure and mechanical pressure of 60t, placing the slurry into a forming die in a slurry sucking or grouting manner, and then dehydrating the slurry to obtain a wet blank with the water content of 70%.

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of 50 ℃, vacuum degree of-0.03 Mpa and auxiliary oil pressure or air pressure and mechanical pressure of 20t to obtain a dry blank with the water content of 7%. The product (tableware, wallboard, ceiling, work bag, etc.) is obtained after surface spraying or roller coating and trimming and shaping.

Comparative example 8

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of 50 ℃, vacuum degree of-0.05 Mpa and auxiliary oil pressure or air pressure and mechanical pressure of 20t to obtain a dry blank with the water content of 7%. The product (tableware, wallboard, ceiling, work bag, etc.) is obtained after surface spraying or roller coating and trimming and shaping.

Comparative example 9

Taking 70 parts of chemi-mechanical pulp and 30 parts of mechanical pulp to prepare paper pulp, mixing and stirring 95 parts of paper pulp with 1 part of oil-proofing agent, 1 part of water-proofing agent, 1 part of moisture-proofing agent, 1 part of flame retardant and 1 part of antifouling agent to obtain slurry with the concentration of 1%.

And transferring the wet blank into a heat setting mold, and drying and setting the wet blank under the conditions of 50 ℃ of temperature, 0.03Mpa of vacuum degree and 20t of auxiliary oil pressure or air pressure and mechanical pressure to obtain a dry blank with the water content of 7%. And spraying or rolling the surface of the wall plate, trimming and shaping to obtain the product (the wall plate, the ceiling, the work bag and the like).

By comparing the data of the embodiment and the comparative example, the dimensional deviation, the capacity deviation, the water leakage, the temperature resistance, the cup body stiffness, the load bearing performance, the compression resistance, the box cover folding test, the drop test, the delivery moisture and other performances of the embodiment are superior to those of the comparative example, the parameters within the technical requirement condition range can meet the production of all tableware, wall boards, ceilings and work bags, the parameters of different products can be changed, the production parameters can be adjusted according to different sizes, capacities and shapes of different products, and different products can have different optimal parameters.

The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the description of the embodiments is only intended to facilitate the understanding of the methods and their core concepts of the present application. Meanwhile, a person skilled in the art should, according to the idea of the present application, change or modify the embodiments and applications of the present application based on the scope of the present application. In view of the above, the description should not be taken as limiting the application.

Claims

1. A method for producing a pulp molded product, characterized by comprising:

(1) mixing and stirring paper pulp and a chemical additive to obtain slurry, wherein the concentration of the slurry is 0.3% -0.8%;

(2) under the conditions that the vacuum degree is-0.08 to-0.02 Mpa and the mechanical pressure is 0t to 300t, the slurry is placed into a forming mold in a slurry suction or grouting mode, and the slurry is dehydrated to obtain a wet blank with the water content of 45 to 80 percent;

(3) and transferring the wet blank into a heat setting mold, and drying and setting under the conditions that the temperature is 50-250 ℃, the vacuum degree is-0.08-0.02 Mpa and the mechanical pressure is 0-100 t to obtain a dry blank, wherein the water content of the dry blank is 0-8%.

2. The method of manufacturing according to claim 1, further comprising:

3. The preparation method of claim 1, wherein the pulp is selected from one or more of chemical pulp, chemi-mechanical pulp and mechanical pulp;

the chemical auxiliary agent is selected from one or more of oil-proof agent, waterproof agent, moisture-proof agent, flame retardant, antifouling agent, non-wood fiber material and other acceptable chemical additives, and other natural plant fibers.

4. The method of claim 3, wherein the pulp comprises 0 to 100 parts of the chemical pulp, 0 to 100 parts of the chemi-mechanical pulp, and 0 to 100 parts of the mechanical pulp, based on an oven dry pulp weight.

5. The method according to claim 3, wherein the pulp comprises 30 to 70 parts of the chemical pulp, 20 to 50 parts of the chemical pulp and 25 to 55 parts of the mechanical pulp by weight of an oven dry pulp.

6. The method according to claim 3, wherein the pulp comprises 40 to 60 parts of the chemical pulp, 25 to 35 parts of the chemi-mechanical pulp and 35 to 45 parts of the mechanical pulp.

7. A pulp molded product characterized by being produced by the production method according to any one of claims 1 to 6.

8. The pulp molded product according to claim 7, characterized in that the pulp molded product is mainly made of 80 to 100 parts of the pulp and 0 to 20 parts of a chemical assistant, based on an oven dry pulp weight.

9. The pulp molded product according to claim 7, characterized in that the pulp molded product is mainly made of 90 to 100 parts by weight of the pulp, 0 to 1 part by weight of the oil repellent agent, and 0 to 1 part by weight of the water repellent agent, based on an oven dry weight.

10. The pulp molded product according to claim 7, characterized in that the pulp molded product is mainly made of 82 to 89 parts by weight of the pulp, 1 to 2 parts by weight of the oil repellent agent, 1 to 1.5 parts by weight of the water repellent agent, 2 to 2.5 parts by weight of the moisture repellent agent, 3 to 4 parts by weight of the flame retardant agent, and 5 to 10 parts by weight of the non-wood fiber material based on an oven dry weight.