CN112626908A

CN112626908A - Method for manufacturing environment-friendly weather-resistant functional household board surface coating base paper

Info

Publication number: CN112626908A
Application number: CN202011470829.XA
Authority: CN
Inventors: 吴广宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-04-09

Abstract

The invention provides a manufacturing method of environment-friendly weather-resistant functional household board surface base paper, which comprises the steps of defibering, grinding into pulp, adding an auxiliary agent, making paper, drying in the second step, calendering, reeling and trimming. The absorption performance of the environment-friendly weather-resistant functional household board facing base paper is more than or equal to 45mm/10min, the wet strength is less than or equal to 5.0N/M, and the opacity is more than or equal to 90%. Therefore, composite surface paper is not needed, a mode of firstly dipping glue and then printing can be adopted, the stock of dealers is reduced, the composite processing procedure is saved for subsequent processing enterprises, the time, the human material and the site cost are saved, and the ever-changing patterns of market users can be met with the least fund. And the raw paper for the face dressing does not use an anti-seepage agent, has high absorption performance, endows the raw paper finished product with more practical functions, has the same surface and inner surface as the finished product, has high printing reduction degree, and meets the requirement of environmental protection.

Description

Method for manufacturing environment-friendly weather-resistant functional household board surface coating base paper

Technical Field

The invention relates to the technical field of pulping and papermaking, in particular to a method for manufacturing environment-friendly weather-resistant functional household board coating base paper.

Background

The traditional paper for the furniture template is generally divided into three categories, including balance paper, facing paper and coating paper, and is mainly used for priming, facing and coating of household boards according to different production processes, and has the effects of reducing the deformation rate of the boards, improving the wear resistance and brightness of the boards and the like. The paper making raw material includes waste paper pulp, commodity wood pulp and chemical fibre, in particular, it is made up by using domestic balance paper, and basically adopts pure waste books and newspapers, and its paper making process mainly includes breaking-deinking-degritting-cleaning-toning-making-slitting-packaging, and the above-mentioned processes can produce lots of waste water and solid stickies.

And the paper mill always recycles the waste water under the requirements of energy conservation and emission reduction. To control the effect of anions and stickies in the recycled water on production, large amounts of chemicals such as polyaluminium chloride, polyacrylamide, fixing agents and aluminium sulphate have to be used. The direct influence is that the chemical raw materials in the finished paper product seriously exceed the standard and hidden danger is buried for the subsequent plate finished product. Therefore, the paper is only used as the base paper of the board facing at present, and the outer layer is simply impregnated and then compounded with a layer of surface paper to realize the board facing. There is a problem in that if the face paper is damaged, the exposed portion of the base paper releases formaldehyde and various chemical substances to the outside, which is harmful to the health of the user.

In addition, although the overlay paper and the wrapping paper meet the requirement of environmental protection, in the traditional processing technology of the whole paper for the board, the paper sheets of the two kinds of paper are very thin, and the tissue paper is difficult to have high absorption performance, namely, the tissue paper cannot have the functions of flexibility, hardness, fire resistance, deodorization, termite resistance and sterilization. The method is characterized by low function selectivity, complex processing technology and serious pollution.

The absorption performance of the existing household base paper is less than or equal to 30mm/10min, the wet strength is more than or equal to 6.0N/M, the opacity is 80-83%, and the coverage to a base material is poor. To compensate for the low opacity, heavier colors are typically used for printing. Therefore, the base paper for home furnishing, which has strong absorption performance and high opacity and meets the environmental protection requirement, needs to be provided.

In view of this, the invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a method for manufacturing environment-friendly weather-resistant functional household board coating base paper.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the invention relates to a method for manufacturing environment-friendly weather-resistant functional household board coating base paper, which comprises the following steps:

(1) fluffing: feeding the papermaking raw material into a hydrapulper for defibering to obtain first pulp;

preferably, the papermaking raw material is a mixed pulp of needle blade pulp and broad blade pulp, and more preferably, the mass percentage of the needle blade pulp in the mixed pulp is 20-40%.

Preferably, the papermaking raw material also comprises titanium dioxide, and the mass ratio of the titanium dioxide to the mixed pulp is (5-15): 100. The titanium dioxide is the main component, and can improve the whiteness of the finished product of the facing base paper as a white pigment. If no titanium dioxide is added or the addition amount is insufficient, the finished product obtained after high-temperature and high-pressure treatment has transparent appearance, namely the opacity is reduced. The titanium dioxide is preferably added in the defibering process, and because the titanium dioxide is added in the defibering process, fibers can form a package for the titanium dioxide in the subsequent pulping process, and the titanium dioxide is more remained in the pulp. If titanium dioxide is added in the process of adding the auxiliary agent in the step (3), the retention rate of the titanium dioxide is reduced by 10-15%. And the titanium dioxide is added in the defibering process, so that the uniform dispersion of the titanium dioxide can be realized in the subsequent pulping process.

Preferably, the fluffing time is more than or equal to 40 min.

It should be noted that the needle blade pulp and the broad blade pulp are different mainly in that: 1) the raw materials are different: the softwood pulp is prepared from coniferous trees as raw materials, and the main tree species comprise pine and the like. Hardwood pulp is prepared from broad-leaved trees as raw material, and the main tree species include eucalyptus, poplar, birch, etc. 2) The price is different: softwood pulp is generally more expensive than hardwood pulp for the same grade. 3) The performances are different: the softwood pulp has long and thin fibers, and the wood pulp is relatively pure and has few impurities. Hardwood pulp fibers are coarse and short, a large number of hybrid cells are between fibers and non-fibers, the strength of the finished paper is relatively low, the finished paper is loose, the absorption performance is strong, and the opacity is high. Hardwood pulp fibers are short, typically about 1 millimeter in length, and have aspect ratios of up to 60 times greater.

If the needle blade pulp is used alone, the produced paper has good flexibility, high folding resistance, good tensile strength and good printing performance, but has poor hygroscopicity, uniformity and flatness. The hardwood pulp is used alone, and the produced paper has high bulk, high stiffness, good packing performance, but poor bursting strength and folding strength. The present invention thus makes paper using a mixed pulp comprising needle pulp and broad-leaf pulp.

In one embodiment of the present invention, the needle-leaf pulp and the broad-leaf pulp are flocculent pulp or pulp sheet, which needs to be prepared into dissolving pulp. It is therefore necessary to feed the paper stock into the hydropulper for fluffing through the stock inlet.

(2) Grinding: feeding the first pulp into continuous pulp grinding equipment for grinding to obtain second pulp;

preferably, the beating degree of the refining is 20-23 DEG SR. The beating degree refers to the length of the beaten fibers, and the longer the beating time is; the larger the beating degree value, the shorter the fiber. The pulp obtained by the beating degree can not only keep a certain fiber length and obtain better air permeability, but also improve hydrogen bonds and Van der Waals force between fibers, so that the fibers have good bonding force.

The applicant researches and discovers that the refined fibers, particularly broad-leaved pulp have better devillicate brooming condition and stronger bonding force among the fibers.

(3) Adding an auxiliary agent: feeding the second slurry into a slurry storage tank, and adding an auxiliary agent comprising a wet strength agent, royal blue, aluminum sulfate and kaolin into the slurry storage tank to obtain a third slurry;

preferably, the wet strength agent is added in an amount of 10-20 kg for 1 ton of pulp, and preferably 15 kg for 1 ton of pulp. The effect is to improve the wet strength of the base paper of the dressing, preferably polyamide-epichlorohydrin (PAE) wet strength agent.

Preferably, the royal blue is also called basic royal blue, and the dosage of the royal blue is 10-12 g added into 1 ton pulp, so that the effect of preventing the base paper of the face coating from yellowing is achieved. The paper can be yellowed due to the subsequent high-temperature drying treatment, and if the paper is not added with royal blue, the paper cannot be used for the veneering of light-colored furniture.

Preferably, the aluminum sulfate is acidic, the pH value of the third slurry after the aluminum sulfate is added is 6.9-7.1, and the effects of improving the positive charge on the surface of the slurry and keeping the high retention force of the slurry are achieved. As the fibers have negative charges, most of the added auxiliary agents in the step also have negative charges, and like charges repel each other, so that the added auxiliary agents are difficult to remain on the surfaces of the fibers, and a large amount of auxiliary agents are discharged with water after subsequent forming, squeezing and dewatering. Not only wastes the auxiliary agent, but also increases the difficulty of wastewater treatment. The addition of aluminium sulphate can solve this problem.

Preferably, the kaolin accounts for 4 to 6 percent, preferably 5 percent, of the third slurry by mass, and the function of the kaolin is to increase the high-temperature resistance of the base paper for dressing.

In addition, dyes such as brilliant blue, lemon yellow, carmine and the like can be added into the second sizing agent according to the use requirement, and a color fixing agent is optionally added.

(4) Papermaking: feeding the third slurry into a paper machine, and sequentially carrying out papermaking forming, squeezing, dewatering and drying to obtain a dry paper sheet;

preferably, the pulp is washed before papermaking, and the third pulp is diluted to prevent the fibers from being unevenly distributed in the paper. The mass percentage of the fiber in the third sizing agent after the pulp washing is 0.5-0.6%.

Preferably, the papermaking forming adopts a cylinder multi-cylinder paper machine, and wet paper sheets are obtained after the papermaking forming. Typical papermaking machines include cylinder and fourdrinier machines, which are the preferred paper machines for use in the present invention because they produce thinner paper.

Because the water in the wet paper sheet is in a free state and a combined state, the free water can be removed by multi-stage pressing, and the combined water cannot be removed by pressing, the pressed wet paper sheet is dried at a high temperature. The drying temperature is 80-100 ℃.

Preferably, for subsequent printing and facing needs, the overlay base paper should have a smooth, rough surface. The smooth surface is used for printing, and the rough surface is used for furniture veneering, so that the firmness of the veneering can be improved. The drying can be carried out by adopting a vat paper machine, and specifically, saturated steam is introduced into the vat paper machine for rapid heating until the water content in the dried paper is less than or equal to 20 percent. The dried sheet is then fed into another dryer to smooth the rough side.

Preferably, after the dried sheet is obtained, a high water absorption coating is applied on the surface of the sheet in a coating machine. The effect is to improve the gloss of the printed surface of the paper and reduce the anti-absorption performance of the paper. Preferably, the internal high water absorption coating is mineral fiber, such as fiber of aluminum silicate, gypsum, wollastonite, vermiculite and other materials. The coating material is coated in the form of water-soluble liquid, and the paper becomes very wet after coating processing, and secondary drying is necessary.

(5) And a second step of drying: drying the wet paper coated with the built-in high water absorption coating in the second step;

preferably, the second drying step is carried out in a multi-dryer section and functions to continue to evaporate moisture from the wet sheet to a moisture content of 5% or less in the sheet.

(6) And performing calendaring, bundling and trimming on the paper dried in the second step in sequence to obtain the household board surface base paper.

The invention also relates to the household board surface base paper obtained by the method. The specification of the household plate surface-coating base paper is 150-170 g/m²The thickness is 20-25 μ M, the absorption performance is more than or equal to 45mm/10min, the wet strength is 4.0-5.0N/M, and the opacity is more than or equal to 90%.

In one embodiment of the invention, the specification is 150g/m²Thickness of paperThe degree was 20 μm. For the specification of 170g/m²The thickness of the paper (2) is 23 to 25 μm.

The invention has the beneficial effects that:

the environment-friendly weather-resistant functional household board facing base paper provided by the invention has the absorption performance of more than or equal to 45mm/10min, the wet strength of less than or equal to 5.0N/M and the opacity of more than or equal to 90%. Therefore, composite surface paper is not needed, a mode of firstly dipping glue and then printing can be adopted, the stock of dealers is reduced, the composite processing procedure is saved for subsequent processing enterprises, the time, the human material and the site cost are saved, and the ever-changing patterns of market users can be met with the least fund. And the raw paper for the face dressing does not use an anti-seepage agent, has high absorption performance, endows the raw paper finished product with more practical functions, has the same surface and inner surface as the finished product, has high printing reduction degree, and meets the requirement of environmental protection.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Example 1

A method for manufacturing environment-friendly weather-resistant functional household board surface base paper comprises the following steps:

wherein, the papermaking raw materials are mixed pulp and titanium dioxide. The mixed pulp contains needle-leaf pulp and broad-leaf pulp, and the mass percentage of the needle-leaf pulp in the mixed pulp is 30%. The mass ratio of the titanium dioxide to the mixed slurry is 10: 100. The disintegration time is 40 min.

(2) Grinding: feeding the first pulp into continuous pulping equipment for pulping, wherein the beating degree of the pulping is 22-degree SR, and obtaining second pulp;

(3) adding an auxiliary agent: feeding the second slurry into a slurry storage tank, and adding an auxiliary agent comprising a wet strength agent, royal blue, aluminum sulfate and kaolin into the slurry storage tank to obtain third slurry;

wherein, the wet strength agent is PAE wet strength agent, the dosage is 1 ton pulp added with 15 kg; the dosage of the royal blue is 10 g added into 1 ton of pulp; the pH value of the third slurry after the aluminum sulfate is added is 7.0; the mass percentage of the kaolin in the third slurry is 5%.

(4) Papermaking: the third pulp is washed, then sent to a paper machine, sequentially subjected to cylinder multi-cylinder papermaking forming, squeezing, dewatering and drying to obtain a dry paper sheet, and then coated with high water absorption coating aluminum silicate fiber in a machine on the surface of the dry paper sheet to obtain a wet paper sheet;

(5) and a second step of drying: drying the wet paper coated with the built-in high water absorption coating in the second step until the water content in the paper is less than or equal to 5 percent;

The reaction conditions in examples 2 to 6 were varied, and the specific settings are shown in Table 1.

TABLE 1

Examples	Modified reaction conditions
		Example 2	And (3) adding titanium dioxide together with the auxiliary agent in the step (3) without adding titanium dioxide in the step (1).
Example 3	In the step (1), needle blade pulp is used for replacing mixed pulp.
		Example 4	In the step (1), broad leaves are usedThe pulp replaces the mixed pulp.
Example 5	The beating degree of the refining in the step (2) is 18 DEG SR.
		Example 6	The beating degree of the jordaning in the step (2) is 25 degrees SR.

Other parameters of each example were the same as those of example 1 except for the parameters described in table 1. The comparative example was a commercial base paper for home use.

And (3) carrying out performance test on the household base paper obtained in the embodiment. Wherein the absorption property test is carried out in a water absorption height meter, and a test piece with the width of 15mm is immersed in room-temperature purified water with the depth of 5 mm. And taking the contact surface of the sample and water as a zero point, and measuring the water lifting height on the sample after 10 min.

Wet strength testing was performed on a tensile machine.

The opacity test was performed on an opacity meter.

The test results of the above examples are shown in Table 2.

TABLE 2

Compared with the comparative example, the example 1 shows that the household base paper has higher density, higher opacity and good substrate coverage. As the added wet strength agent is equivalent to 1/3 added in the prior art, the wet strength of the household base paper is lower than that of a comparative example, but the use requirement (more than or equal to 4.0N/M) can be met.

Comparing example 2 with example 1, it can be seen that titanium dioxide is added in the defibering process, and the fibers can form a package for the titanium dioxide in the subsequent pulping process, and the titanium dioxide is more remained in the pulp. If titanium dioxide is added in the process of adding the auxiliary agent in the step (3), the retention rate of the titanium dioxide is reduced, and the opacity is reduced.

Comparing examples 3 and 4 with example 1, it can be seen that if the needle pulp is used alone, the resulting paper has good flexibility, high folding strength, good tensile strength, good printing properties, but poor moisture absorption, uniformity and flatness. The hardwood pulp is used alone, and the produced paper has high bulk, high stiffness, good packing performance, but poor bursting strength and folding strength. The present invention thus makes paper using a mixed pulp comprising needle pulp and broad-leaf pulp.

Comparing examples 5 and 6 with example 1, it is shown that the change in pummel was not as significant in the absorbency and opacity, but was greater in the wet strength. The degree of beating increases, corresponding to a decrease in fibre length, and therefore the wet strength decreases accordingly.

Therefore, the technical scheme of the invention has the following advantages:

1. the problem that the chemical raw materials of the raw paper exceed the standard is solved from the source, and the raw material for making paper adopts 100 percent primary commodity wood pulp, so that the abuse of the chemical raw materials is thoroughly avoided.

2. The reuse of white water (produced in the paper making process) adopts a physical precipitation method, no chemical is added, and the use of clear water adopts an ion exchange method to control the hardness and acidity of a water source.

3. The pulping process adopts free pulping to keep the inherent characteristics of the cellulose. The bulk of the finished product is improved by appropriate devillicating fibrillation, so that the product has high absorption performance.

4. The printing property of the product is improved, the titanium dioxide is used as the filler, on one hand, the covering property of the finished product paper is greatly improved, on the other hand, the whiteness of the finished product paper is improved, the low whiteness of the finished product caused by the low whiteness of the commodity wood pulp is avoided, the ground color of the processed finished product is bright, the light-color pattern can be printed, and the traditional method of whitening by using a carcinogen fluorescent whitening agent is abandoned.

5. The product can have both front and back sides according to the use requirement. Wherein the front surface is flat and smooth, and is suitable for high-precision reduction of the printed embossed patterns; the reverse side is rough, which can improve the contact area of the processed paper product and the base material, and improve the composite fastness. In the actual production process, multi-net multi-section forming, a single-side gloss processing technology and subsequent matte treatment are adopted, the multi-net multi-section forming ensures the uniformity and fineness of fibers of finished paper, multi-section dehydration is carried out through mechanical pressing, a single-side gloss processing device is adopted in a drying part, and rolling is carried out after calendaring.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A method for manufacturing environment-friendly weather-resistant functional household board surface base paper is characterized by comprising the following steps:

(5) and a second step of drying: drying the dry paper in the second step;

2. The method according to claim 1, wherein in the step (1), the papermaking raw material is a mixed pulp of needle blade pulp and broad blade pulp, and the mass percentage of the needle blade pulp in the mixed pulp is preferably 20-40%.

3. The method according to claim 1, wherein in the step (1), the papermaking raw material further comprises titanium dioxide, and preferably the mass ratio of the titanium dioxide to the mixed pulp is (5-15): 100.

4. The method according to claim 1, wherein in step (2), the beating degree of the refining is 20-23 ° SR.

5. The method according to claim 1, wherein in the step (3), the wet strength agent is added in an amount of 10-20 kg per ton of pulp;

the dosage of the royal blue is 10-12 g added into 1 ton of pulp;

the pH value of the third slurry after the aluminum sulfate is added is 6.9-7.1;

the mass percentage of the kaolin in the third slurry is 4-6%.

6. The method according to claim 1, wherein in the step (4), the pulp washing is performed before the papermaking, and the mass percentage of the fiber in the third pulp after the pulp washing is 0.5-0.6%.

7. The method of claim 1, wherein in step (4), the papermaking forming uses a cylinder mould multi-cylinder paper machine.

8. The method of claim 1 wherein in step (4) after the dried sheet is obtained, applying a machine-made superabsorbent coating to the surface thereof, said machine-made superabsorbent coating being mineral fiber.

9. The method according to claim 1, characterized in that in step (4) the second drying is carried out in a multi-cylinder dryer section until the moisture content in the paper sheet is less than or equal to 5%.

10. A household board finish prepared according to the method of any one of claims 1 to 9The base paper is characterized in that the specification of the household board surface-coating base paper is 150-170 g/m²The thickness is 20-25 μ M, the absorption performance is more than or equal to 45mm/10min, the wet strength is 4.0-5.0N/M, and the opacity is more than or equal to 90%.