Surface sizing auxiliary agent and use method thereof

文档序号：803732 发布日期：2021-03-26 浏览：43次中文

阅读说明：本技术 一种表胶助剂及其使用方法 (Surface sizing auxiliary agent and use method thereof ) 是由张敏盛张益盛潘玉丽于 2020-12-10 设计创作，主要内容包括：本发明公开了一种表胶助剂包含以下重量份的组分：聚乙烯醇30-50份,烷基烯酮二聚体(AKD)微粒10-20份,羟丙基甲基纤维素10-20份,疏水性化合物3-8份,亲水性化合物10-20份,引发剂0.1-3.5份,乙二醛0.2-1.2份,pH调节剂0-1.2份,淀粉0.2-1.2份。本发明是无毒无害的表胶助剂；本发明提供的表胶助剂可以提高纸张表面强度及环压强度、耐破度等物理指标,减少纸张掉毛掉粉、印刷糊版现象,提高印刷质量；将本发明所述表胶助剂可以改善防回潮性能。(The invention discloses a surface sizing auxiliary agent which comprises the following components in parts by weight: 30-50 parts of polyvinyl alcohol, 10-20 parts of Alkyl Ketene Dimer (AKD) particles, 10-20 parts of hydroxypropyl methyl cellulose, 3-8 parts of hydrophobic compounds, 10-20 parts of hydrophilic compounds, 0.1-3.5 parts of initiators, 0.2-1.2 parts of glyoxal, 0-1.2 parts of pH regulators and 0.2-1.2 parts of starch. The invention is a nontoxic and harmless surface adhesive auxiliary agent; the surface sizing auxiliary agent provided by the invention can improve physical indexes such as paper surface strength, ring crush strength and bursting strength, reduces the phenomena of paper linting and dusting and printing pasting, and improves the printing quality; the surface sizing additive can improve the moisture regain resistance.)

1. The surface sizing auxiliary agent is characterized by comprising the following components in parts by weight:

2. the topping rubber auxiliary of claim 1 wherein the hydrophobic compound is selected from one or more of styrene, butyl acrylate, and t-butyl acrylate.

3. The topcoat adhesive adjuvant of claim 1, wherein the hydrophilic compound is one or two selected from the group consisting of maleic acid and acrylic acid.

4. The skim latex auxiliary according to claim 1, wherein said initiator is selected from one or more of ammonium persulfate, sodium persulfate, and potassium persulfate.

5. The surface sizing aid according to claim 1, wherein the pH regulator is one or more selected from the group consisting of potassium bicarbonate and potassium dihydrogen carbonate.

6. The surface sizing aid according to claim 1 wherein the surface sizing aid is a whitish or clear viscous transparent liquid.

7. The surface sizing aid according to claim 1, wherein the surface sizing aid has a solids content of 12 ± 1%.

8. The skim latex additive according to claim 1, wherein said skim latex additive has a viscosity (25 ℃, mpa.s) of 1000-.

9. The surface sizing aid according to claim 1 wherein the pH of the surface sizing aid is from 4 to 6.

10. A method of using the surface sizing aid of any one of claims 1 to 9, wherein the surface sizing aid is added both by surface addition and by slurry addition.

Technical Field

The invention belongs to the technical field of development and utilization of papermaking green chemicals, and particularly relates to a surface sizing auxiliary agent.

Background

Surface sizing is the process of applying an aqueous dispersion of one or more auxiliaries to the surface of paper or board by means of a special apparatus. This process can bring numerous benefits to the paper mill: (1) the retention rate of the surface sizing agent is close to 100 percent, and the use efficiency is high; (2) the sizing cost is low, when the internal sizing is limited, the sizing effect can be further improved, and the problems of paper strength reduction, paper machine station pollution, white water load increase and the like caused by the internal sizing agent are solved; (3) the paper can bring a plurality of special properties for subsequent processing technology and final products, such as solving the problem of hair and powder falling in the printing process, reducing paper broken ends, improving the water resistance, surface strength, physical strength, wear resistance and durability of the paper, reducing the difference of two sides of the paper and the like.

The natural polymer products represented by starch have the advantages of wide sources, low price, easy biodegradation and the like, and always occupy an important proportion in the market of surface sizing agents. However, natural starch has high viscosity and poor fluidity, is easy to gel, is easy to precipitate after being diluted by water, and is not suitable for surface sizing of paper.

In order to overcome the defects that the affinity of a starch surface sizing agent and fibers is poor and a film layer is easy to shrink and crack in a drying process, synthetic polymers such as PVA, PAM and the like are introduced firstly. The PVA mainly has two types of 1799 and 1788, and the coating weight is 1g/m²The IGT surface strength of the offset printing paper can reach 100 cm/s. When the PAM is used as a surface sizing agent, a large amount of acylamino is contained in the structure of the PAM, so that hydrogen bonds can be formed with hydroxyl in fibers, the strength of paper is improved, and the PAM is frequently used in the process of recycling secondary fibers for papermaking at present, particularly in corrugated box board paper and low-basis-weight newsprint paper. However, PVA is very expensive because it is difficult to dissolve, is used in large amounts, does not impart good water resistance to paper, and has a large effect on the gloss of printing inks.

The market needs to develop a surface adhesive auxiliary agent with strong comprehensive performance, safety and no toxicity.

Disclosure of Invention

In view of the problems in the prior art, an object of the present invention is to provide a surface sizing aid. The invention also provides a preparation method of the surface sizing auxiliary agent. The surface sizing auxiliary agent provided by the invention can improve physical indexes such as paper surface strength, ring crush strength and bursting strength, improves moisture regain resistance, reduces the phenomena of paper linting and powder falling and printing pasting, and improves printing quality.

The invention adopts the following technical scheme:

the surface sizing auxiliary agent comprises the following components in parts by weight:

preferably, the surface sizing auxiliary agent comprises the following components in parts by weight:

further, the hydrophobic compound is selected from one or more of styrene, butyl acrylate and tert-butyl acrylate.

Further, the hydrophilic compound is selected from one or two of maleic acid and acrylic acid.

Further, the initiator is selected from one or more of ammonium persulfate, sodium persulfate and potassium persulfate.

Further, the pH regulator is selected from one or more of potassium bicarbonate and potassium dihydrogen carbonate.

Furthermore, AKD particles are uniformly diffused and redistributed on the fiber surface to form a highly oriented monomolecular layer, free hydroxyl groups on cellulose and reactive functional groups of AKD form a beta-ketoester covalent bond connection in the drying and storage stages, products are attached to paper pulp fibers to form a layer of nano-scale thickness film, the hydrophobic alkyl chains of the nano-scale thickness film face outwards to endow the fibers with hydrophobicity, the anti-moisture-regaining performance of paper is effectively improved, the phenomena of paper hair and powder falling and printing pasting are reduced, and the printing quality is improved.

Further, after the surface sizing auxiliary agent is applied to the surface of paper, the sizing agent can be aligned. The hydrophilic group in the surface sizing auxiliary agent faces inwards and is combined with the pulp fibers, so that the surface sizing auxiliary agent is firmly adhered to the surface of the paper, and the hydrophobic group faces outwards to resist the entry of external water molecules, so that the physical indexes of the surface strength, the ring crush strength, the burst strength and the like of the paper are effectively improved.

Further, the surface sizing auxiliary agent is a slightly white or transparent viscous transparent liquid.

Further, the solid content of the surface sizing auxiliary agent is 12 +/-1%.

Further, the viscosity (25 ℃, mPa.s) of the surface sizing aid is 1000-4000.

Further, the pH value of the surface sizing auxiliary agent is 4-6.

The application method of the surface sizing auxiliary agent comprises the following steps: surface addition and in-slurry addition.

Further, the surface addition is typically used in combination with various surface sizing starches, at a level of 2-4Kg per ton of paper.

Further, the in-slurry addition comprises the following steps: before use, the mixture is diluted by 10 to 20 times with water, stirred evenly and directly added into a pulping tank, a papermaking tank, an inlet of a pulp flushing pump or a head tank. The dosage is 5-10 per ton of paper.

The invention has the beneficial effects that:

1. the invention is a nontoxic and harmless surface adhesive auxiliary agent;

2. the surface sizing auxiliary agent provided by the invention can improve physical indexes such as paper surface strength, ring crush strength and bursting strength, reduces the phenomena of paper linting and dusting and printing pasting, and improves the printing quality.

3. The surface sizing additive can improve the moisture regain resistance.

Detailed Description

For better explanation of the present invention, the following specific examples are further illustrated, but the present invention is not limited to the specific examples.

Example 1