A kind of wear-resistant and acid-resistant black paper and its processing technology

Abstract

The invention discloses a wear-resistant and acid-resistant black paper, and the raw materials for preparing the paper include: wear-resistant paper, glue, ink and auxiliary agent, wherein the ink addition amount is 5-10% of the glue mass, and the auxiliary agent addition amount is 3-5‰ of the glue mass. The invention adopts a combination of acrylamide and diethylene glycol as a plasticizer for melamine-formaldehyde resin, and adopts a weight ratio of (2-3): (7-8), which can reduce the cracking of the glue on the paper surface, improve the toughness of the impregnated paper, avoid excessive brittleness, and easily break the problem. And improve the dispersion of ink in the resin glue, make the color in the resin glue evenly dispersed, and not prone to white spots, dry flowers, white flowers, and wet flowers. Improve the wear resistance and scratch resistance of the wear-resistant paper, and at the same time have corrosion resistance, acid resistance, and burn resistance, and have good gloss after being combined with particleboard.

Description

Technical Field

[0001] The invention relates to a wear-resistant and acid-resistant black paper and a processing technology thereof, and relates to D21H, and in particular to the field of impregnated paper with specific performance treatment. Background Art

[0002] Artificial boards prepared by pasting decorative paper on artificial boards are beautiful and fashionable, and are increasingly loved by consumers. The boards prepared by impregnating paper into resin and then pressing it with artificial boards are inexpensive and have good comprehensive performance. However, in the traditional processing technology, the paper is first dyed and then impregnated into resin. After impregnation and curing, white spots and white flowers are prone to appear on the surface of dark impregnated paper, especially black paper. After the resin is cured, curing defects such as dry flowers and wet flowers will appear, and the defective rate is high. In addition, after the traditional impregnated paper is pressed with the board, it has poor wear resistance and is prone to scratches. It also lacks acid resistance and corrosion resistance, and its applicable environment is limited.

[0003] Chinese invention patent CN202110038244.9 discloses a modified melamine formaldehyde impregnated paper and a preparation method thereof. By modifying the melamine formaldehyde resin and using carbon dioxide supercritical treatment for impregnation, the impregnation adhesion between paper and melamine formaldehyde resin is improved, and the impregnated paper has a certain tensile strength, but the wear resistance and scratch resistance of the impregnated paper are not good. Chinese invention patent CN202211165403.2 discloses a preparation process of high-solid content melamine formaldehyde resin for impregnated paper. The solid content of the resin is adjusted by controlling the amount of water, diethylene glycol and caprolactam to extend the storage period of the resin. However, the solid content of the formed resin is high and the viscosity is large, so the impregnation effect on the wear-resistant paper is not good, and the effect of full and uniform penetration cannot be achieved. Summary of the invention

[0004] In order to improve the production and processing defects on the surface of black paper and improve the wear resistance and scratch resistance of impregnated paper, the first aspect of the present invention provides a wear-resistant and acid-resistant black paper, the preparation raw materials include: wear-resistant paper, glue, ink and additives, the ink addition amount is 5-10% of the glue mass, and the additive addition amount is 3-5‰ of the glue mass.

[0005] As a preferred embodiment, the auxiliary agent includes a curing agent and a release agent, the curing agent is added in an amount of 1-3‰ of the mass of the glue, and the release agent is added in an amount of 1-3‰ of the mass of the glue.

[0006] As a preferred embodiment, the glue is melamine-formaldehyde resin glue, and the raw materials for preparation include at least formaldehyde, water, melamine and plasticizer, and the weight ratio of the formaldehyde to melamine is 1: (1.80-1.95). More preferably, the weight ratio of the formaldehyde to melamine is 1: (1.85-1.92).

[0007] As a preferred embodiment, the plasticizer is selected from one or a combination of acrylamide, diethylene glycol, ethylene glycol, triethylene glycol, and ethylene glycol monobutyl ether.

[0008] As a preferred embodiment, the plasticizer is a combination of acrylamide and diethylene glycol, and the mass ratio of acrylamide to diethylene glycol is (2-3): (7-8).

[0009] The applicant discovered during the experiment that melamine-formaldehyde resin glue contains a large number of hydrogen bonds, and the resin molecules are very brittle after curing. In particular, after the glue is mixed with ink, the melamine-formaldehyde resin contains hydroxymethyl groups that do not participate in the reaction. After impregnation and curing with paper, the impregnated paper becomes brittle and easily breaks. The applicant can increase the toughness of melamine-formaldehyde resin glue by introducing acrylamide and diethylene glycol, and acrylamide, diethylene glycol and melamine also have a good compatibility effect and will not cause major changes in the molecular structure. This may be because diethylene glycol weakens the secondary bonds between melamine molecules, increases the mobility of polymer molecules, and reduces the crystallinity of melamine molecular chains. In addition, diethylene glycol increases the solubility of ink in melamine-formaldehyde resin, reduces the formation of hydroxymethyl groups, reduces the combination of resin and moisture in the air, and reduces the hygroscopicity of paper. In addition, acrylamide and diethylene glycol work together to increase the adhesion performance of glue to wear-resistant paper in a weight ratio of (2-3): (7-8). Acrylamide relies on electrical neutralization bridging to increase the binding property of small particles on the surface of wear-resistant paper and glue, thereby improving the adhesion of wear-resistant paper to glue.

[0010] As a preferred embodiment, the preparation method of the melamine-formaldehyde resin glue comprises the following steps:

[0011] (1) Mix formaldehyde, water and plasticizer, and adjust the pH to 9-9.5 with alkali;

[0012] (2) adding melamine, raising the temperature, and keeping the temperature to react;

[0013] (3) Adjust the water-soluble ratio, cool down and discharge the material.

[0014] As a preferred embodiment, the reaction temperature of step 2 is 85-95°C, and the reaction time is 80-100 min. As a preferred embodiment, the base is selected from one or a combination of sodium hydroxide, sodium carbonate, and sodium bicarbonate.

[0015] As a preferred embodiment, the water-soluble ratio in step 3 is the mass ratio of melamine-formaldehyde resin to water, and the mass ratio of melamine-formaldehyde resin to water is 1:(2-2.5). More preferably, the mass ratio of melamine-formaldehyde resin to water is 1:2.2.

[0016] The applicant found in actual production that in the traditional process, the base paper is processed into black paper and then the glue dipping process is carried out, which is prone to white spots, white spots, dry spots, and wet spots. The reason is that when the resin glue is cured on the black paper, the unevenness of the glue curing is obvious. In this application, the melamine-formaldehyde resin glue is pre-mixed with the ink, and then impregnated and cured, which can reduce the occurrence of surface problems. However, the applicant further found that after the melamine-formaldehyde resin glue is mixed with the ink, the viscosity increases significantly, and the permeability to the wear-resistant paper is not good. The amount of glue impregnated on the wear-resistant paper is small, and the technical effect of impregnated paper cannot be achieved. In this application, by optimizing the weight ratio of melamine and formaldehyde in the melamine-formaldehyde resin, and adding water to adjust the viscosity of the melamine-formaldehyde resin glue, the sharp change of the glue viscosity after the ink is added is avoided, thereby improving the penetration effect of the wear-resistant paper on the glue, and the addition of water promotes the dispersion of the ink in the melamine-formaldehyde resin micelles, avoiding the problem of uneven color.

[0017] As a preferred embodiment, the composite weight ratio of the wear-resistant paper and the glue is 1:(100-105).

[0018] As a preferred implementation manner, the composite weight ratio of the wear-resistant paper and the glue is 1:102.

[0019] During the experiment, the applicant found that when the composite weight ratio of wear-resistant paper and melamine-formaldehyde resin glue is 1: (100-105), the surface effect of the prepared impregnated paper is good, and the wear resistance and scratch resistance of the impregnated paper are significantly improved. The reason may be: within the preferred weight ratio range, the wear-resistant paper can be completely impregnated, and the melamine-formaldehyde resin glue on the surface of the wear-resistant paper can be evenly distributed. If the weight ratio exceeds the preferred range, the amount of glue is too large, and the glue layer is prone to cracking. In addition, if the amount of glue is too much, there will be excess resin on the decorative layer on the surface of the wear-resistant paper, resulting in poor surface sealing and easy scratching. The applicant further found that when the weight ratio exceeds the preferred range, when the impregnated paper is pressed onto the surface of the particle board, the temperature penetration of the resin glue is not strong, which will cause the melamine-formaldehyde resin glue to have a poor curing effect on the surface of the particle board, which is not conducive to the pressing of the impregnated paper on the surface of the particle board.

[0020] The second aspect of the present invention provides a processing technology for the wear-resistant and acid-resistant black paper, comprising the following steps:

[0021] (1) adding an auxiliary agent to the glue and mixing and stirring evenly, and then adding the ink and mixing to obtain a glue composition;

[0022] (2) immersing the wear-resistant paper into the glue composition;

[0023] (3) Press plate.

[0024] As a preferred embodiment, in step 3, the pressing plate is to take out the impregnated wear-resistant paper and then press it together; the pressing plate parameters are: pressing plate temperature 170-205° C., pressing plate time 30-60s.

[0025] The applicant found that after the prepared impregnated black paper and particleboard were pressed at 170-205°C for 30-60s, the surface corrosion resistance, acid resistance, and burn resistance were greatly improved, and the surface gloss of the formed pressed board was excellent. The reason may be: rapid pressing in a short time can reduce the compression rate of the particleboard, and the surface structure of the formed black paper changes greatly and has a dense structure, achieving good corrosion resistance, acid resistance, and burn resistance. However, in order to achieve the effect of complete curing in a short time, it is necessary to control the pressing temperature. When the pressing temperature is too low, the degree of curing of the melamine-formaldehyde resin glue on the surface of the impregnated paper is insufficient, affecting the corrosion resistance, acid resistance, and burn resistance of the black paper surface. When the curing temperature is too high, the fluidity of the melamine-formaldehyde resin glue decreases, resulting in over-curing, affecting the surface gloss of the black paper, and surface cracking may occur.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The wear-resistant and acid-resistant black paper of the present invention adopts a combination of acrylamide and diethylene glycol as a plasticizer for melamine-formaldehyde resin and adopts a weight ratio of (2-3): (7-8), which can reduce the cracking of glue on the paper surface, improve the toughness of the impregnated paper, and avoid excessive brittleness and easy breakage.

[0028] (2) The wear-resistant and acid-resistant black paper of the present invention has a mass ratio of melamine to formaldehyde in the melamine-formaldehyde resin glue of 1: (1.85-1.92), and a water solubility ratio of melamine-formaldehyde resin to water of 1: (2-2.5), which improves the permeability of the glue doped with ink to the wear-resistant paper, improves the dispersion of ink in the resin glue, makes the color in the resin glue evenly dispersed, and is less likely to have white spots, dry flowers, white flowers, and wet flowers.

[0029] (3) The wear-resistant and acid-resistant black paper of the present invention has a composite weight ratio of 1:(100-105) between the wear-resistant paper and the glue, which improves the wear resistance of the wear-resistant paper and the scratch resistance of the impregnated paper.

[0030] (4) In the processing technology of the wear-resistant and acid-resistant black paper of the present invention, the pressing temperature of the impregnated paper and the particle board is 170-205°C, and the pressing time is 30-60s, so that the prepared black paper has corrosion resistance, acid resistance, and burn resistance, and has good gloss after being combined with the particle board.

[0031] (5) The processing technology of the wear-resistant and acid-resistant black paper of the present invention is to mix the ink and glue before impregnation, which reduces the production cost of black paper, avoids the occurrence of surface problems of black paper, and improves the qualified rate of products. The black paper process of the present application can be applied to the production of mirror black paper, linen black paper, etc., with good surface performance, especially in the processing and production of mirror black paper, there is no need to worry about the wet flower problem caused by the failure of air bubbles to be discharged, and the application range is wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a real picture of the black paper pressboard prepared in Example 1;

[0033] Figure 2 This is a real picture of the black paper pressboard prepared in Comparative Example 1;

[0034] Figure 3 This is a picture of the actual production of Example 1. DETAILED DESCRIPTION

[0035] Example 1

[0036] A wear-resistant and acid-resistant black paper, the preparation raw materials of which include: wear-resistant paper, glue, ink and auxiliary agent, the ink addition amount is 8% of the glue mass, and the auxiliary agent addition amount is 4‰ of the glue mass.

[0037] The auxiliary agent includes a curing agent and a release agent, the curing agent is added in an amount of 2‰ of the mass of the glue, and the release agent is added in an amount of 2‰ of the mass of the glue. The curing agent is purchased from Hangzhou Lin'an Dean Chemical Co., Ltd., with a brand name of XL-910S; the release agent is purchased from Hangzhou Lin'an Dean Chemical Co., Ltd., with a brand name of XL-524.

[0038] The ink was purchased from Lin'an Tianjiang Water-Based Ink Co., Ltd. The wear-resistant paper was purchased from Qifeng New Materials Co., Ltd.

[0039] The glue is melamine-formaldehyde resin glue, and the preparation raw materials include formaldehyde, water, melamine and plasticizer, and the weight ratio of the formaldehyde to melamine is 1:1.89.

[0040] The plasticizer is a combination of acrylamide and diethylene glycol, and the mass ratio of acrylamide to diethylene glycol is 2.5:7.5.

[0041] The amount of water added is 18% of the mass of formaldehyde, and the amount of plasticizer added is 3% of the mass of formaldehyde.

[0042] The preparation method of the melamine-formaldehyde resin glue comprises the following steps:

[0043] (1) Mix formaldehyde, water and plasticizer, and adjust the pH to 9.5 with alkali;

[0044] (2) adding melamine, raising the temperature, and keeping the temperature to react;

[0045] (3) Adjust the water-soluble ratio, cool down and discharge the material.

[0046] The reaction temperature of step 2 is 90° C. and the reaction time is 90 min. The base is sodium carbonate.

[0047] The water-soluble ratio in step 3 is the mass ratio of melamine-formaldehyde resin to water, and the mass ratio of melamine-formaldehyde resin to water is 1:2.2.

[0048] The composite weight ratio of the wear-resistant paper to the glue is 1:102.

[0049] A processing technology for the wear-resistant and acid-resistant black paper comprises the following steps:

[0050] (1) adding an auxiliary agent to the glue and mixing and stirring evenly, and then adding the ink and mixing to obtain a glue composition;

[0051] (2) immersing the wear-resistant paper into the glue composition;

[0052] (3) Press plate.

[0053] In step 3, the pressing plate is used to take out the impregnated wear-resistant paper and then press it together; the pressing plate parameters are: pressing plate temperature 200° C., pressing plate time 50 seconds.

[0054] Comparative Example 1

[0055] A wear-resistant and acid-resistant black paper and a processing technology thereof. The specific steps are the same as those in Example 1, except that in step 3, the mass ratio of melamine-formaldehyde resin to water is 1:2.5.

[0056] Comparative Example 2

[0057] A wear-resistant and acid-resistant black paper and a processing technology thereof. The specific steps are the same as those in Example 1, except that the weight ratio of formaldehyde to melamine is 1:2, and the amount of ink added is 10% of the mass of glue.

[0058] Performance Testing

[0059] 1. Viscosity: Refer to GB / T1723-1993 standard to test the viscosity of the glue composition, and apply the outflow time of 4 cups of test sample.

[0060] 2. Abrasion resistance: Refer to GB / T18102-2007 standard to test the abrasion resistance of black paper. Apply an external force of 4.9N to make it break. The damage area is ≥0.6mm. 2 The number of wear revolutions.

[0061] 3. Scratch resistance: The scratch resistance of black paper prepared according to GB / T18102-2007 standard test is tested to see the external force it withstands when scratches appear.

[0062] 4. Corrosion resistance: After pressing the plate, drop concentrated hydrochloric acid onto the surface of the black paper, and test whether there is any trace after leaving it for 10 minutes.

[0063] 5. Burn resistance: Refer to GB / T17657-1999 standard to test the burn resistance of the prepared black paper. Light a cigarette and place it on the board. Wait until the cigarette is burned out to test whether there is any trace.

[0064] The test results are shown in Table 1.

[0065] Table 1

[0066] Example 1 Comparative Example 1 Comparative Example 2 Viscosity / s 16 12 / Wear resistance / rotation 500 300 / Scratch resistance / N 2.5 1.5 / Corrosion resistance No trace There are traces / Burn resistance No trace There are traces /

[0067] In comparative example 2, workers found during stirring and debugging that the viscosity was too high, and the viscosity test would damage the instrument. The high viscosity had a poor impregnation effect on the wear-resistant paper, and subsequent tests were meaningless, so they were abandoned.

[0068] It can be seen from the pictures of Example 1 and Comparative Example 1 that the black paper of Comparative Example 1 will have a whitening problem in a cloud state when enlarged, and is accompanied by white spots, and the appearance is poor.

Claims

1. A wear-resistant and acid-resistant black paper, characterized in that: The raw materials include: wear-resistant paper, glue, ink and additives, wherein the ink is added in an amount of 5-10% of the glue mass, and the additive is added in an amount of 3-5‰ of the glue mass; The glue is melamine-formaldehyde resin glue, and the raw materials for preparation include at least formaldehyde, water, melamine and plasticizer, and the weight ratio of formaldehyde to melamine is 1: (1.80-1.95); The plasticizer is a combination of acrylamide and diethylene glycol, and the mass ratio of acrylamide to diethylene glycol is (2-3): (7-8); The preparation method of the melamine-formaldehyde resin glue comprises the following steps: (1) Mix formaldehyde, water and plasticizer and adjust the pH to 9-9.5; (2) adding melamine, raising the temperature, and maintaining the temperature for reaction to obtain melamine-formaldehyde resin; (3) Adjust the water-soluble ratio, cool and discharge the material; The water-soluble ratio in step 3 is the mass ratio of melamine-formaldehyde resin to water, and the mass ratio of melamine-formaldehyde resin to water is 1:(2-2.5).

2. The wear-resistant and acid-resistant black paper according to claim 1, characterized in that: The reaction temperature of step 2 is 85-95° C., and the reaction time is 80-100 min.

3. The wear-resistant and acid-resistant black paper according to claim 1, characterized in that: The composite weight ratio of the wear-resistant paper and the glue is 1:(100-105).

4. A processing technology for the wear-resistant and acid-resistant black paper according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) adding an auxiliary agent to the glue and mixing and stirring evenly, and then adding the ink and mixing to obtain a glue composition; (2) immersing the wear-resistant paper into the glue composition; (3) Press plate.

5. The processing technology of the wear-resistant and acid-resistant black paper according to claim 4 is characterized in that: In step 3, the pressing plate is used to take out the impregnated wear-resistant paper and then press it together; the pressing plate parameters are: pressing plate temperature 170-205° C., pressing plate time 30-60 seconds.

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