CN1310079A

CN1310079A - Plastic-fiber board making process

Info

Publication number: CN1310079A
Application number: CN 00103010
Authority: CN
Inventors: 褚天一
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-02-25
Filing date: 2000-02-25
Publication date: 2001-08-29
Anticipated expiration: 2020-02-25
Also published as: CN1174843C

Abstract

Plastic fiber board is produced by using solid dust and waste slag exhausted by paper mill as material and the production includes the processes of dewatering; neutralizing; fiber carding to expand granulated fiber into linear fiber; mixing, coupling and coagulation by adding chemical preparation to form fibrous structure in the mixture, densifying to form compact structure; and demolding and stoving. The board product may be used in packing, heat insulating furniture and building.

Description

Method for manufacturing plastic-fiber board

The invention relates to a method for manufacturing a fiber board, in particular to a method for manufacturing a plastic-fiber board.

Paper making enterprises need to discharge a large amount of waste, such as solid waste pollutants-waste dust and sludge of ascending and descending of the paper making enterprises, while producing paper, effective treatment cannot be achieved all the time, the solid waste is piled in the open air for a long time, occupies a large amount of land, is bad for the environment and ecological, is not attractive, influences the image of the enterprises, and forms a serious practical problem.

The invention aims to provide a method for manufacturing a plastic-fiber board, which utilizes a large amount of solid garbage pollutants discharged by paper-making enterprises, namely waste dust and sludge, which generally comprises fiber dust, various micro short fibers, plastic sheets and other impurities, as raw materials, applies resin powder and a plasticizing chemical coupling agent in the raw materials, uniformly stirs and heats the raw materials so that the resin and the chemical agent are dissolved and condensed in a mixture, and is pressurized and solidified to manufacture the plastic-fiber board. The solid waste discharged by paper-making enterprises can be effectively treated, and certain economic benefit can be generated while the treatment is carried out. In the prior art, a density plywood is manufactured by pressing wood fibers or grass fibers serving as raw materials and adhesive serving as a bonding material, but in the invention, waste dust and dirt generated by a paper making enterprise are used as raw materials, and because the waste dust and dirt are lack of long fibers such as wood and grass fibers but have more granular substances, the use strength and other required performances such as planing, nailing and the like of the board manufactured by the method cannot be ensured, and the problems of low strength and poor performance caused by the lack of the large fibers in the dirt must be solved.

The invention is realized according to the following technical scheme. The manufacturing method of the plastic-fiber board comprises the following steps: the plastic-fiber board is prepared from the raw materials of solid garbage, namely waste dust and sludge, which cause ascending and descending of the waste dust and sludge discharged by a paper factory, according to the following working procedures:

and (1) dehydrating. Removing water from the raw material.

2, neutralizing. The raw materials are chemically treated to make the pH value of the raw materials neutral.

And 3, combing and spreading the fibers. And (3) combing the spherical fibers in the raw materials into linear free bodies.

4, mixing and coupling. Adding a coupling agent and a first additive into the raw materials, and uniformly stirring to combine and couple the fibers in the raw materials and the first additive.

5 condensation reaction. And adding a second additive into the combined and coupled raw materials, and uniformly stirring to enable the second additive and the fibers in the raw materials to be coagulated and solidified.

And 6, pressing, compacting and solidifying. Pressurizing the coagulated and solidified raw materials in a mould to enable the raw materials to be tightly formed, and removing the coupling agent.

And 7, demolding and drying. And demolding and drying the densely formed product.

In the step 4, in the mixing and coupling, the first additive is phenolic resin, and the coupling agent is absolute ethyl alcohol, and the weight ratio of the first additive to the coupling agent is as follows: the absolute ethyl alcohol accounts for 15-25% of the weight of the raw material, the balance is a mixture of phenolic resin and the raw material, wherein the phenolic resin accounts for 3-9% of the weight of the mixture, and the temperature is 37-90 ℃ during stirring. In the step 5, in the coagulation reaction, the weight of the second additive is 2.5-5.5% of the total weight of the mixture, and the second additive comprises the following components in percentage by weight of the second additive:

25-35% of terephthalic acid dibutyrate and 3-7% of ethylenediamine

The rest of the epoxy resin is added to 100 percent,

while stirring, the temperature was maintained at 80-120 ℃.

In the step 6, in the process of pressurizing, compacting and curing, the pressurizing pressure is 3-4MPa, and the holding temperature is 80-120 ℃. The invention takes solid waste discharged by paper making enterprises, namely waste dust and dirt, as raw materials, and neutralizes the dirt according to the pH value of the dirt, and neutralizes the dirt into neutral substances according to a conventional method to provide conditions for the subsequent working procedures. In the treated dust and dirt, the first additive, namely resin powder and a coupling agent are applied to ensure that the fibers and the additive are combined together by the resin and the fibers which permeate in the dust and dirt at a certain temperature to be densely pulled and combined to form a fiber structure, thereby enhancing the strength of the product. And applying a second additive, condensing and curing the coupled structure at a certain temperature to strengthen the strength of the product, and finally pressing, compacting and curing to further compact the product and improve the compactness. And removing the coupling agent to finally form the product. Then demoulding and drying to obtain the product.

In conclusion, the invention takes the solid pollutant dust waste residue discharged by paper making enterprises as the raw material, combs and spreads the fiber in the waste residue, couples and coagulates the fiber, so that the resin and the coupling agent which permeate the dust and the waste residue are catalyzed, a fiber structure is formed in the mixture, the fiber structure is densely pulled, and the serious defects that the dust contained in the waste residue is less in large fiber and not easy to densely bind are changed. The resin particles in the dirt dust are intensively drawn and connected in the pyrolysis combination of the additive coupling agent to form the toughening-assisted molding. The invention not only solves the problem of solid waste dust pollution discharged by paper making enterprises and beautifies the natural environment, but also can convert the dirty slag waste into plastic fiber boards of valuable industrial and living goods, thereby creating wealth for the society. The plastic-fiber board of the invention has no phenomena of softness, layering, bubbling, carbonization and the like, has plasticity superior to that of a density board, can be planed and nailed, and can be used for manufacturing boards, packing box boards, heat-insulating boards, profiles required by furniture and building decoration, and the like.

The following embodiments are specifically described.

Example (b): the product is GB99-1 type 0.48-0.86 g/cm³The manufacturing method of the plastic-fiber board is as follows:

and (1) dehydrating. The method takes solid pollutant waste dust and residue discharged by paper making enterprises as raw materials, and the components of the raw materials are detected to comprise the following substances in percentage by weight: 57% of fiber dust, 28% of micro-short fiber, 7% of applicable fiber (more than 0.2 mm), 8% of sundries such as plastic sheets, tin foils, adhesive tapes and the like, and rolling out water by using a double-roller dehydrator.

2, neutralizing. According to the fact that the raw material is acid, Ca (OH)₂Neutralizing the pH value of the solution to be 7,

the raw materials were neutralized in a blender.

And 3, combing and spreading the fibers. Combing and spreading the fibers combined into balls in the raw materials into linear free body fibers in a ball fiber combing and spreading machine, so that the raw materials do not contain spherical fiber bodies.

4, mixing and coupling. Adding coupling agent absolute ethyl alcohol and first additive phenolic resin into the raw materials, and uniformly stirring in a stirrer, wherein the weight ratio of each component is as follows: the anhydrous ethanol accounts for 20% of the weight of the raw materials, the balance is the mixture of the phenolic resin and the raw materials, wherein the phenolic resin accounts for 6% of the weight of the mixture, and the temperature is kept at 70 ℃ during stirring, so that the fibers in the raw materials are combined and coupled with the first additive.

5 condensation reaction. And adding the second additive into the coupled raw materials, stirring in a stirrer, and uniformly stirring to enable the second additive and the fibers in the raw materials to be coagulated and solidified. The weight of the second additive is 4% of the total weight of the mixture, and the second additive comprises the following components in percentage by weight of the second additive:

30 percent of terephthalic acid dibutyrate, 5 percent of ethylenediamine and the balance of epoxy resin are added to 100 percent, and the temperature of the introduced steam is 110 ℃ during stirring.

And 6, pressing, compacting and solidifying. Putting the coagulated and solidified raw materials into a mould, pressurizing to make the raw materials be tightly combined and formed. The pressure was 3.5MPa and the temperature was 100 ℃. During pressurization, one side of the mold is in a sieve shape to filter out and remove the coupling agent.

And 7, demolding and drying. The mold is removed and the product is dried in a dryer at a temperature of 105 ℃. After drying, calendering can be carried out, and the product is calendered in a double-roll calender.

Claims

1. A manufacturing method of a plastic-fiber board is characterized by comprising the following steps: the plastic-fiber board is prepared from the raw materials of solid garbage, namely waste dust and sludge, which cause ascending and descending of the waste dust and sludge discharged by a paper factory, according to the following working procedures:

(1) and (4) dehydrating. Removing water from the raw material.

(2) And (4) neutralizing. The raw materials are chemically treated to make the pH value of the raw materials neutral.

(3) And (5) carding and spreading fibers. And (3) combing the spherical fibers in the raw materials into linear free bodies.

(4) And (3) mixing and coupling. Adding a coupling agent and a first additive into the raw materials, and uniformly stirring to combine and couple the fibers in the raw materials and the first additive.

(5) And (4) carrying out condensation reaction. And adding a second additive into the combined and coupled raw materials, and uniformly stirring to enable the second additive and the fibers in the raw materials to be coagulated and solidified.

(6) And (5) pressing, compacting and solidifying. Pressurizing the coagulated and solidified raw materials in a mould to enable the raw materials to be tightly formed, and removing the coupling agent.

(7) And (5) demolding and drying. And demolding and drying the densely formed product.

2. The method for manufacturing the plastic-dimensional board as claimed in claim 1, wherein the method comprises the following steps: in the step (4), in the mixing and coupling, the first additive is phenolic resin, and the coupling agent is absolute ethyl alcohol, and the weight ratio is as follows: the absolute ethyl alcohol accounts for 15-25% of the weight of the raw material, the balance is a mixture of phenolic resin and the raw material, wherein the phenolic resin accounts for 3-9% of the weight of the mixture, and the temperature is 37-90 ℃ during stirring.

3. The method for manufacturing the plastic-dimensional board as claimed in claim 1, wherein the method comprises the following steps: in the coagulation reaction in the step (5), the weight of the second additive is 2.5-5.5% of the total weight of themixture, and the second additive comprises the following components in percentage by weight of the second additive:

25-35% of terephthalic acid dibutyrate and 3-7% of ethylenediamine

The rest of the epoxy resin is added to 100 percent,

while stirring, the temperature was maintained at 80-120 ℃.

4. The method for manufacturing the plastic-dimensional board as claimed in claim 1, wherein the method comprises the following steps: in the step (6), the pressurizing pressure is 3-4MPa and the holding temperature is 80-120 ℃.