阅读说明：本技术 一种阳离子型施胶剂及其制备方法和应用 (Cationic sizing agent and preparation method and application thereof ) 是由 施晓旦 段鹏真 金霞朝 于 2018-09-12 设计创作，主要内容包括：本发明公开了一种阳离子型施胶剂的制备方法,包括如下步骤：步骤一,将环氧类单体和胺类单体在水中混合,常温下充分反应；步骤二,向步骤一的产物中加入碱性物、淀粉、造纸黑液提取物混合并充分反应后,得到所述阳离子型施胶剂。本发明的阳离子型施胶剂是一种新型的施胶剂,该施胶剂以可再生的天然材料作为原料,满足绿色化学的要求,符合可持续发展的市场导向。从性能来讲,该产品结构中引入了阳离子基团,对纸张纤维有较好的附着能力,无需加入大量固着剂,即可增强纸张的耐水性和强度。(The invention discloses a preparation method of a cationic sizing agent, which comprises the following steps: mixing an epoxy monomer and an amine monomer in water, and fully reacting at normal temperature; and step two, adding an alkaline substance, starch and a papermaking black liquor extract into the product obtained in the step one, mixing and fully reacting to obtain the cationic sizing agent. The cationic sizing agent disclosed by the invention is a novel sizing agent, and the sizing agent takes renewable natural materials as raw materials, meets the requirements of green chemistry, and accords with the market guidance of sustainable development. In terms of performance, the cationic group is introduced into the product structure, so that the product has good adhesive capacity to paper fibers, and the water resistance and strength of the paper can be enhanced without adding a large amount of fixing agents.)

1. The preparation method of the cationic sizing agent is characterized by comprising the following steps:

mixing an epoxy monomer and an amine monomer in water, and fully reacting at normal temperature;

and step two, adding an alkaline substance, starch and a papermaking black liquor extract into the product obtained in the step one, mixing and fully reacting to obtain the cationic sizing agent.

2. The method of claim 1, wherein the weight parts of each component are as follows:

3. the method according to claim 1, wherein the epoxy monomer is at least one selected from the group consisting of ethylene oxide, propylene oxide, epichlorohydrin, and epoxy resins.

4. The method of claim 1, wherein the amine monomer is selected from at least one of dimethylamine, diethylamine, trimethylamine, and triethylamine.

5. The method according to claim 1, wherein the papermaking black liquor extract is selected from one or two of hemicellulose, cellulose and xylose.

6. The method of claim 1, wherein the starch is selected from at least one of corn starch, tapioca starch, and potato starch.

7. The method of claim 1, wherein the alkali is at least one member selected from the group consisting of alkali metal hydroxides.

8. The method of claim 1, wherein the reaction temperature in step two is 80-90 ℃.

9. A cationic sizing agent prepared according to the process of any of claims 1 to 8.

10. Use of a cationic size according to claim 9 for internal sizing of a paper making stock.

Technical Field

The invention relates to the field of preparation of pulping and papermaking sizing agents, and particularly relates to a cationic sizing agent and a preparation method thereof.

Background

The sizing agent is an additive for paper making, and can endow paper with certain physical properties by a sizing process, prevent the penetration and diffusion of some fluids, and endow the paper and the paperboard with ink resistance, water resistance, emulsion resistance, corrosion resistance and the like so as to improve the smoothness, the strength and the service life of the paper and the paperboard. The AKD sizing agent and the rosin size commonly used at present have the defects of high cost, lagged sizing performance, poor retention effect, high difficulty in treating papermaking sewage and the like.

Disclosure of Invention

The invention aims to provide a preparation method of a cationic sizing agent, which aims to overcome the defects in the prior art, meet the application performance of paper and obviously reduce the pollution to the environment.

The invention is realized by the following technical scheme:

a preparation method of a cationic sizing agent comprises the following steps:

mixing an epoxy monomer and an amine monomer in water, and fully reacting at normal temperature;

and step two, adding an alkaline substance, starch and a papermaking black liquor extract into the product obtained in the step one, mixing and fully reacting to obtain the cationic sizing agent.

Further, the weight parts of the components in the reaction are as follows:

preferably, the epoxy monomer is at least one selected from the group consisting of ethylene oxide, propylene oxide, epichlorohydrin and epoxy resin;

the amine monomer is selected from at least one of dimethylamine, diethylamine, trimethylamine and triethylamine;

the papermaking black liquor extract is selected from one or two of hemicellulose, cellulose and xylose;

the starch is selected from at least one of corn starch, cassava starch and potato starch;

the alkali is at least one of alkali metal hydroxide, preferably sodium hydroxide, and preferably 50 wt% sodium hydroxide solution.

Further preferably, the reaction temperature in the second step is 80 to 90 ℃.

The water added in the reaction is mainly used for dispersing the epoxy monomers and the amine monomers, and the amount of the water added in the reaction can be easily adjusted by a person skilled in the art according to the actual reaction needs. The preferred amount is 300-1200 parts by weight.

The cationic sizing agent prepared by the method has the solid content of 15-50 wt%.

The cationic sizing agent of the invention can be used for internal sizing of papermaking pulp.

The cationic sizing agent disclosed by the invention is a novel sizing agent, and the sizing agent takes renewable natural materials as raw materials, meets the requirements of green chemistry, and accords with the market guidance of sustainable development. In terms of performance, the cationic group is introduced into the product structure, so that the product has good adhesive capacity to paper fibers, and the water resistance and strength of the paper can be enhanced without adding a large amount of fixing agents.

Detailed Description

The invention is illustrated below by means of specific examples, without being restricted thereto.