A kind of padding paper and its preparation method and application

Abstract

The present application relates to the field of padding paper preparation, and specifically discloses a padding paper and its preparation method and application. The preparation of the padding paper described in the present application includes the following steps: S1, pulping the oil-containing waste padding paper and removing the residue to obtain waste paper fibers; S2, placing the waste paper fibers described in step S1 in a disc concentrator for degumming treatment to obtain degummed fibers; S3, adding an oil-proof agent to the degummed fibers described in step S2 to prepare wet paper sheets; S4, sequentially performing a pressing treatment, a drying treatment and a calendering treatment on the wet paper sheets described in step S3 to obtain primary padding paper; S5, performing a film-forming treatment on the primary padding paper described in step S4 to obtain the padding paper; the padding paper is composed of a paper layer and a gel layer coated on both sides of the paper layer. The present application uses oil-containing waste padding paper as raw material, and can completely remove adhesives in the oil-containing waste padding paper during the preparation process, ensuring that the prepared padding paper will not have translucent spot paper disease.

Description

Technical Field

[0001] The present application relates to the field of padding paper preparation, and more specifically, to a padding paper and a preparation method and application thereof. Background Art

[0002] Oily waste padding refers to used padding recovered from cold-rolled stainless steel mills after use in the rolling process. Due to the absorption of rolling oil remaining on the stainless steel surface during use, the padding contains 10-15% oil. Since the padding used in the rolling process is mostly recycled and rewound from flattening and rewinding mills, the roll typically has 3-7 joints per 10,000 meters, and these joints are typically bonded with standard double-sided tape.

[0003] During the recycling process of oily waste backing paper, residual adhesive or glue from adhesive tape on the waste backing paper can enter the pulping system along with the oily waste backing paper. During the secondary papermaking process, the forming wire and top wire can become clogged with adhesive, resulting in numerous translucent spots on the finished paper. This problem is known as translucent spot paper disease. When used as stainless steel backing paper, paper containing translucent spots can cause surface defects on the steel plate due to insufficient performance. Therefore, addressing this problem has become a pressing issue in the field. Summary of the Invention

[0004] In order to solve the problem of translucent spot paper defects existing in the related art, the present application provides a pad paper and a preparation method and application thereof.

[0005] In a first aspect, the present application provides a method for preparing a padding paper, which adopts the following technical solution:

[0006] A method for preparing a padding paper comprises the following steps:

[0007] S1. pulping the oily waste paper and removing the residue to obtain waste paper fibers;

[0008] S2. placing the waste paper fibers described in step S1 in a disc thickener for degumming to obtain degummed fibers;

[0009] S3, adding an oil-proof agent to the fibers after degumming in step S2 to produce a wet paper sheet;

[0010] S4, sequentially subjecting the wet paper sheets in step S3 to a pressing process, a drying process, and a calendering process to obtain a primary padding paper;

[0011] S5. Performing film-forming treatment on the primary padding paper in step S4 to obtain the padding paper.

[0012] This application effectively removes adhesives from oily waste backing paper through a debonding process, preventing the problem of adhesives clogging the forming mesh and top mesh, and ensuring that the final backing paper does not have translucent spots. Furthermore, this application also performs a film-forming process on the primary backing paper, thereby improving the overall performance of the backing paper.

[0013] Preferably, the degumming agent used in the degumming treatment includes: agent A and agent B, wherein the agent A includes limonene, lauryl polyoxyethylene ether and a polar organic solvent, and the agent B includes an oxidant.

[0014] The present application utilizes an oxidant to destroy the structure of adhesives, thereby effectively improving the effect of the adhesive removal treatment. In addition, the present application utilizes limonene and lauryl polyoxyethylene ether to increase the solubility of adhesives, so that the adhesives can be completely removed from the waste paper fibers, thereby ensuring that the adhesives are completely removed during the adhesive removal treatment.

[0015] Preferably, the debonding agent comprises, by mass, 90-99 parts of agent A and 1-10 parts of agent B; the agent A comprises, by mass, 20-50 parts of limonene, 5-15 parts of lauryl alcohol polyoxyethylene ether and 25-75 parts of a polar organic solvent; the agent B comprises, by mass, 1-10 parts of an oxidant.

[0016] This application limits the mass fraction of the debonding agent components to ensure that the content of each component can completely remove the stickies, thereby avoiding the incomplete removal of stickies due to a low content of a certain component or the damage of waste paper fibers due to an excessively high content of a certain component.

[0017] Preferably, the oxidant comprises one or more of hydrogen peroxide, peracetic acid, chlorate or perchlorate.

[0018] The present application effectively improves the degumming effect by limiting the type of the oxidant and can ensure that the waste paper fibers do not produce discoloration.

[0019] Preferably, the polar organic solvent includes methanol, ethanol, propanol or tetrahydrofuran.

[0020] The present application limits the type of the polar organic solvent, thereby enabling limonene and lauryl alcohol polyoxyethylene ether to coexist stably.

[0021] Preferably, the film-forming treatment specifically includes the following steps: S5.1, placing the primary padding paper in step S4 in a surface sizing machine, coating the surface of the primary padding paper with a hydrophilic gel, and drying to obtain the padding paper.

[0022] The present application can effectively improve the hydrophilicity of the primary padding paper by coating the hydrophilic gel on the surface of the primary padding paper.

[0023] Preferably, the hydrophilic gel comprises one or more of methyl cellulose, sodium hydroxymethyl cellulose, hydroxypropyl methyl cellulose and hydroxyethyl cellulose.

[0024] The present application ensures that the padding paper has high hydrophilicity by limiting the composition of the hydrophilic gel.

[0025] In a second aspect, the present application provides a padding paper, which adopts the following technical solution:

[0026] A padding paper is prepared by the preparation method described in the above scheme.

[0027] The padding paper provided by the present application does not contain translucent spots, which effectively solves the problem of translucent spot paper defects.

[0028] Preferably, the padding paper consists of a paper layer and a gel layer coated on both sides of the paper layer.

[0029] The present application can ensure that the padding paper has good hydrophilicity by limiting the structure of the padding paper.

[0030] In a third aspect, the present application provides the application of the padding paper described in the aforementioned solution in stainless steel padding paper.

[0031] The padding paper provided in the present application does not contain translucent spots. When used as a padding paper for stainless steel, it can ensure that the stainless steel material will not have surface defects due to problems with the padding paper.

[0032] In summary, this application has the following beneficial effects:

[0033] 1. The preparation method provided in the present application removes the glue from the waste paper fibers, thereby ensuring that the prepared pad paper will not have translucent spots, thus solving the problem of translucent spot paper defects.

[0034] 2. The padding paper provided in the present application has a gel layer, which can improve the hydrophilicity of the padding paper and improve the overall performance of the padding paper.

[0035] 3. When the padding paper provided in this application is used as a stainless steel padding paper, since there is no translucent point, it can ensure that the stainless steel material will not have surface defects due to padding paper problems. DETAILED DESCRIPTION

[0036] The present application is further described in detail below with reference to the embodiments.

[0037] Preparation Example 1

[0038] The preparation method of adhesive remover A comprises the following steps:

[0039] Glue remover A was obtained by uniformly mixing 20 parts of limonene, 5 parts of lauryl alcohol polyoxyethylene ether and 74 parts of methanol.

[0040] Glue remover B uses 1 part hydrogen peroxide.

[0041] Preparation Example 2-5

[0042] The difference between Preparation Examples 2-5 and Preparation Example 1 is that different raw material ratios are used. The raw material ratios of Preparation Examples 1-5 are shown in Table 1.

[0043] Table 1 Raw materials for preparation of adhesive remover A and B in Example 1-5

[0044] project Limonene Lauryl polyoxyethylene ether Polar organic solvents oxidants Preparation Example 1 20 servings 5 servings 74 servings 1 part hydrogen peroxide Preparation Example 2 20 servings 5 servings 64 servings 10 parts hydrogen peroxide Preparation Example 3 50 servings 15 servings 24 servings 1 part hydrogen peroxide Preparation Example 4 35 servings 10 servings 60 servings 5 parts hydrogen peroxide Preparation Example 5 39 servings 10 servings 50 servings 1 part hydrogen peroxide

[0045] Comparative Examples 1-4

[0046] The difference between Comparative Examples 1-4 and Preparation Example 1 is that different raw material ratios are used. The raw material ratios of Comparative Examples 1-4 are shown in Table 2.

[0047] Table 2 Raw materials of adhesive remover A and B of comparative examples 1-4

[0048] project Limonene Lauryl polyoxyethylene ether Polar organic solvents oxidants Comparative Example 1 20 servings 5 servings 75 servings 0 parts hydrogen peroxide Comparative Example 2 20 servings 5 servings 55 servings 20 parts hydrogen peroxide Comparative Example 3 0 copies 10 servings 85 servings 5 parts hydrogen peroxide Comparative Example 4 20 servings 0 copies 75 servings 5 parts hydrogen peroxide

[0049] Performance testing was conducted on the adhesive removal agents in Preparation Examples 1-5 and Comparative Examples 1-4. The adhesive removal performance testing method specifically included the following steps: Adhesive Remover Agent B from Preparation Examples 1-5 and Comparative Examples 1-4 was mixed with different groups of waste paper fibers with the same adhesive content, allowed to stand for 30 minutes, and then Adhesive Remover Agent A was added, followed by a 10-minute stand. The resulting data is shown in Table 3.

[0050] Table 3 Glue removal performance test results of the degumming agents in Preparation Examples 1-5 and Comparative Examples 1-4

[0051] project Residual glue content Preparation Example 1 0.08％ Preparation Example 2 0.05％ Preparation Example 3 0.06％ Preparation Example 4 0.04％ Preparation Example 5 0.05％ Comparative Example 1 11.5％ Comparative Example 2 9.5％ Comparative Example 3 12.1％ Comparative Example 4 8.6％

[0052] Combining Preparation Examples 1-5 and Comparative Examples 1-4 and Table 3, it can be seen that the debonding agent used in this application can effectively remove adhesives from waste paper fibers, and the residual adhesive content is below 1.0%. According to Table 3, it can be seen that the debonding agent provided by Preparation Example 4 has the best debonding effect.

[0053] Example 1

[0054] A method for preparing a padding paper comprises the following steps:

[0055] S1. pulping the oily waste paper and removing the residue to obtain waste paper fibers;

[0056] S2. Placing the waste paper fibers described in step S1 in a disc thickener for degumming to obtain degummed fibers, wherein the degumming treatment specifically comprises the following steps: placing the waste paper fibers described in step S1 in a disc thickener, adding degumming agent B described in Preparation Example 4, mixing the waste paper fibers and degumming agent B, and allowing the mixture to stand for 30 minutes, adding degumming agent A described in Preparation Example 4, mixing the mixture, and allowing the mixture to stand for 10 minutes to obtain degummed fibers; wherein the amount of degumming agent added is 1.5 kg / ton of paper;

[0057] S3, adding an oil-proof agent to the fibers after degumming in step S2 to produce a wet paper sheet;

[0058] S4, sequentially subjecting the wet paper sheets in step S3 to a pressing process, a drying process, and a calendering process to obtain a primary padding paper;

[0059] S5.1, placing the primary pad paper in step S4 in a surface sizing machine, and applying 1.5-2.0 g / m2 of sizing agent on the surface of the primary pad paper. 2 After coating with sodium hydroxymethyl cellulose, the paper is dried to obtain the padding paper.

[0060] Example 2

[0061] The difference between Example 2 and Example 1 is that the "glue remover B in Preparation Example 4" in Example 1 is replaced by "glue remover B in Preparation Example 1"; the "glue remover A in Preparation Example 4" in Example 1 is replaced by "glue remover A in Preparation Example 1".

[0062] Comparative Example 5

[0063] The difference between Comparative Example 5 and Example 1 is that the "glue remover B in Preparation Example 4" in Example 1 is replaced by the "glue remover B in Comparative Example 4"; the "glue remover A in Preparation Example 4" in Example 1 is replaced by the "glue remover A in Comparative Example 4".

[0064] Performance testing

[0065] The appearance of the pads in Examples 1-2 and Comparative Example 5 was observed. The pads in Examples 1 and 2 had no translucent spots, while the pads in Comparative Example 5 had translucent spots. Therefore, the pads provided by the present application can solve the problem of translucent spot paper defects.

[0066] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for preparing a padding paper, characterized in that: The following steps are involved: S1. pulping the oily waste paper and removing the residue to obtain waste paper fibers; S2. placing the waste paper fibers described in step S1 in a disc thickener for degumming to obtain degummed fibers; S3, adding an oil-proof agent to the fibers after degumming in step S2 to produce a wet paper sheet; S4, sequentially subjecting the wet paper sheets in step S3 to a pressing process, a drying process, and a calendering process to obtain a primary padding paper; S5, performing film-forming treatment on the primary padding paper in step S4 to obtain the padding paper; The degumming agent used in the degumming treatment is composed of agent A and agent B, wherein agent A is composed of limonene, lauryl alcohol polyoxyethylene ether and a polar organic solvent, and agent B is an oxidant; The debonding agent is composed of 90-99 parts of agent A and 1-10 parts of agent B in parts by mass; The agent A is composed of 20-50 parts by mass of limonene, 5-15 parts by mass of lauryl alcohol polyoxyethylene ether and 25-75 parts by mass of a polar organic solvent; The B agent is 1-10 parts by mass of the oxidant.

2. The preparation method according to claim 1, characterized in that The oxidant includes one or more of hydrogen peroxide, peracetic acid, chlorate or perchlorate.

3. The preparation method according to claim 1, characterized in that The polar organic solvent includes methanol, ethanol, propanol or tetrahydrofuran.

4. The preparation method according to claim 1, characterized in that The film forming process specifically includes the following steps: S5.

1. Place the primary gasket paper in step S4 in a surface sizing machine, apply a hydrophilic gel on the surface of the primary gasket paper, and then dry the gasket paper to obtain the gasket paper.

5. The preparation method according to claim 4, characterized in that The hydrophilic gel comprises one or more of methyl cellulose, sodium hydroxymethyl cellulose, hydroxypropyl methyl cellulose and hydroxyethyl cellulose.

6. A padding paper, characterized in that: The invention is prepared by the preparation method according to any one of claims 1 to 5.

7. The padding paper according to claim 6, characterized in that The padding paper consists of a paper layer and gel layers coated on both sides of the paper layer.

8. Use of the gasket paper prepared by the preparation method according to any one of claims 1 to 5 or the gasket paper according to any one of claims 6 to 7 in stainless steel gasket paper.