阅读说明：本技术 一种苯乙烯衍生共聚物类施胶剂及其制备方法 (Styrene derivative copolymer sizing agent and preparation method thereof ) 是由 施晓旦 马腾 金霞朝 于 2018-09-12 设计创作，主要内容包括：本发明公开了一种苯乙烯衍生共聚物类施胶剂,是将酚类物质和有机酸酐与苯乙烯类单体和丙烯酸酯类单体共聚而成的。其制备方法包括如下步骤：将酚类物质、有机酸酐和强碱溶于水中混合后充分反应；再加入丙烯酸酯类单体、苯乙烯类单体、乳化剂、分子量调节剂、引发剂进行自由基聚合,制得所述苯乙烯衍生共聚物类施胶剂。本发明苯乙烯衍生共聚物类施胶剂是一种新型的施胶剂,该施胶剂是在传统SAE施胶剂的基础上,引入酚类物质后,可以明显提高施胶后纸张的强度和耐折度。(The invention discloses a styrene derivative copolymer sizing agent, which is prepared by copolymerizing a phenolic substance, organic acid anhydride, a styrene monomer and an acrylate monomer. The preparation method comprises the following steps: dissolving phenolic substances, organic acid anhydride and strong base in water, mixing and fully reacting; and adding an acrylate monomer, a styrene monomer, an emulsifier, a molecular weight regulator and an initiator to carry out free radical polymerization to prepare the styrene derivative copolymer sizing agent. The styrene derivative copolymer sizing agent is a novel sizing agent, and the sizing agent is based on the traditional SAE sizing agent, and can obviously improve the strength and the folding endurance of sized paper after phenolic substances are introduced.)

1. The sizing agent is characterized in that the sizing agent is prepared by copolymerizing a phenolic substance, an organic acid anhydride, a styrene monomer and an acrylate monomer.

2. The sizing agent of claim 1, wherein the phenolic compound has a general structural formula of formula (I):

in the formula (I), R₁Is hydrogen, alkoxy or aromatic substituent; r₂Is hydrogen, alkoxy or aromatic substituent; r₃Is hydrogen, containing C₁-C₁₂Saturated or unsaturated alkyl, hydroxyl, carboxyl, carbonyl, sulfonic group, amino or aromatic substituent.

3. The styrene-derived copolymer sizing agent according to claim 2, wherein the phenolic substance is selected from at least one of phenol, p-hydroxyphenylpropane, guaiacol, syringyl phenylpropane, p-coumaryl alcohol, coniferyl alcohol, sinapyl alcohol, 5-hydroxy coniferyl alcohol, and copolymers or derivatives thereof.

4. The styrene-derived copolymer sizing agent according to claim 1, wherein the organic anhydride is selected from the group consisting of maleic anhydride, phthalic anhydride, acetic anhydride, glutaric anhydride and C₆-C₁₆At least one of dibasic fatty acid anhydrides.

5. The styrene-derived copolymer sizing agent according to claim 1, wherein the acrylate monomer is selected from the group consisting of acrylonitrile, methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate, acrylic acid and methacrylic acid C₈-C₁₆At least one alkyl ester.

6. A process for preparing a sizing agent of the styrene-derived copolymer type according to any of claims 1 to 5, characterized in that it comprises the following steps: dissolving phenolic substances, organic acid anhydride and strong base in water, mixing and fully reacting; and adding an acrylate monomer, a styrene monomer, an emulsifier, a molecular weight regulator and an initiator to carry out free radical polymerization to prepare the styrene derivative copolymer sizing agent.

7. The method of claim 6, wherein the weight parts of each component are as follows:

8. the method of claim 6, wherein the strong base comprises at least one of an alkali metal hydroxide and an alkaline earth metal hydroxide, preferably sodium hydroxide or potassium hydroxide.

9. The method of claim 6, wherein the molecular weight regulator is selected from at least one of n-dodecyl mercaptan, t-dodecyl mercaptan, and n-butyl mercaptan; the emulsifier is selected from at least one of cationic etherified starch, cationic polyacrylamide or other cationic polymers; the initiator is at least one of potassium persulfate, sodium persulfate and ammonium persulfate.

10. Use of a sizing agent of the styrene-derived copolymer type according to any of claims 1 to 5, for surface sizing of paper.

Technical Field

The invention relates to the field of preparation of sizing agents in paper industry, in particular to a styrene derivative copolymer sizing agent and a preparation method thereof.

Background

The sizing agent is an additive for papermaking, 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 SAE sizing agents commonly used at present have the problems of poor strength and poor folding endurance. Therefore, the prior art has yet to be improved.

Disclosure of Invention

The invention aims to provide a sizing agent of a styrene derivative copolymer and a preparation method of the sizing agent of the styrene derivative copolymer, so as to solve the defects in the prior art.

The invention is realized by the following technical scheme:

a styrene derivative copolymer sizing agent is prepared by copolymerizing phenolic substances, organic acid anhydride, styrene monomers and acrylate monomers.

Preferably, the structural general formula of the phenolic substance is shown as the formula (I):

in the formula (I), R₁Is hydrogen, alkoxy or aromatic substituent; r₂Is hydrogen, alkoxy or aromatic substituent; r₃Is hydrogen, containing C₁-C₁₂Saturated or unsaturated alkyl, hydroxyl, carboxyl, carbonyl, sulfonic group, amino or aromatic substituent.

Further preferably, the phenolic substance is selected from at least one of phenol, p-hydroxyphenylpropane, guaiacol, syringyl phenylpropane, p-coumaryl alcohol, coniferyl alcohol, sinapyl alcohol, 5-hydroxy coniferyl alcohol, and copolymers or derivatives thereof. Preferably at least one selected from phenol, p-hydroxyphenylpropane or guaiacol.

Preferably, the organic anhydride is selected from maleic anhydride, phthalic anhydride, glutaric anhydride, acetic anhydride or C₆-C₁₆At least one of dibasic fatty acid anhydrides; preferably at least one selected from the group consisting of maleic anhydride, phthalic anhydride and glutaric anhydride.

Preferably, the styrene monomer is at least one of styrene or methyl styrene.

Preferably, the acrylic monomer is selected from acrylonitrile, methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate, acrylic acid or methacrylic acid C₈-C₁₆At least one of alkyl esters; n-butyl acrylate or methyl acrylate is preferred.

The sizing agent of the styrene derivative copolymer of the present invention can be synthesized by a polymerization method which is conventional in the art, such as radical polymerization.

Further, the preparation method of the sizing agent of the styrene derivative copolymer comprises the following steps: dissolving phenolic substances, organic acid anhydride and strong base in water, mixing and fully reacting; and adding an acrylate monomer, a styrene monomer, an emulsifier, a molecular weight regulator and an initiator to carry out free radical polymerization to prepare the styrene derivative copolymer sizing agent.

The temperature of the above reaction is generally between 60 ℃ and 90 ℃.

Preferably, the weight parts of the components are as follows:

the strong base comprises an alkali metal hydroxide and an alkaline earth metal hydroxide, preferably at least one of sodium hydroxide or potassium hydroxide.

The emulsifiers, molecular weight regulators and initiators may be used with the aid of auxiliaries customary in the art. Preferably, the molecular weight regulator is at least one selected from n-dodecyl mercaptan, tert-dodecyl mercaptan and n-butyl mercaptan; the emulsifier is at least one of cationic etherified starch, cationic polyacrylamide or other cationic polymers; the initiator is at least one of potassium persulfate, sodium persulfate and ammonium persulfate.

The water used in the reaction system is mainly used as a dispersion medium, and the dosage of the water can be adjusted according to factors such as the dispersion mixing condition of each component, the actual reaction process requirement, the solid content of the final product and the like. In the reaction system, the amount is generally controlled to 200-1200 parts.

The invention also provides application of the styrene derivative copolymer sizing agent, which can be used for surface sizing of paper.

The sizing agent of the styrene derivative copolymer is a novel sizing agent, and the sizing agent is based on the traditional SAE sizing agent and introduces phenolic substances. The inventor finds that the introduction of the phenolic substances can obviously improve the strength and the folding endurance of the sized paper. The concrete mechanism is not clear, probably because after the phenolic substance is added in the polymerization reaction process of the SAE sizing agent, the toughness of the product is improved by the multifunctional group and the benzene ring structure of the phenolic substance, so that the strength and the folding endurance of paper can be improved after sizing.

Detailed Description

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