37results about How to "Reduce the Cobb value" patented technology

The invention discloses a preparation method of a surface sizing agent. The preparation method comprises the following steps that firstly, methyl styrene, acrylic monomers, cationic monomers and an initiating agent are mixed to be uniform to form a mixed monomer; secondly, 10% of the mixed monomer obtained in the first step is added into a four-opening flask, the temperature is raised to 80-140 DEG C, residual mixed monomer is added dropwise after a reaction is carried out for 5-20 minutes, and then the temperature of 80-140 DEG C is kept for 0.5-1.5 hours; thirdly, acetic acid is added, and at the temperature of 80-140 DEG C, a reaction is carried out for 20-60 minutes; fourthly, preheated deionized water with the temperature being 80-100 DEG C is added, a reaction continues to be carried out for 0.5-2 hours, and the mixture is cooled to 25-35 DEG C, zircon salt is added, the mixture is stirred to be uniform, filtering is carried out, and the surface sizing agent is obtained. According to the surface sizing agent, the Cobb value can be greatly reduced, the surface sizing agent can be quickly cured and is basically cured as soon as the surface sizing agent is loaded to a machine, and the surface strength of body paper can be greatly improved under the situation that the dosage of the sizing agent is not changed.

The invention provides a preparing method of a surface sizing agent for a corrugated paper, a product and an application of the surface sizing agent. The surface sizing agent for the corrugated paper is prepared by uniformly mixing a base stock of the surface sizing agent for the corrugated paper with a cationic additive. The preparing method for the base stock of the surface sizing agent for the corrugated paper comprises the steps of adding cationic monomer, siloxane, (metyl)acrylic monomer, (metyl)styrene, an initiator, acetic acid, and water into a reaction vessel, carrying out free radical polymerization reaction to obtain the base stock of the surface sizing agent for the corrugated paper. The preparing method for the cationic additive comprises the steps of adding alkylketene dimmer into an aqueous solution of cationic emulsifier, fully stirring the solution and carrying out emulsification and dispersion to obtain the cationic additive. The surface sizing agent for the corrugated paper obtained through the method can not only cure quickly, sharply improve ring crush compression resistance of the corrugated paper and sharply reduce a COBB value, but also has a very strong anti-dampness performance.

The invention provides a preparation method for a surface sizing agent emulsion. The preparation method comprises the following steps: mixing a cationic polymer with water; adding molten AKD (alkyl ketene dimer) wax and paraffin wax at 70-75 DEG C; and then homogenizing in a condition of 10-25 Mpa, cooling, and then adding glyoxal, so as to obtain the surface sizing agent emulsion, wherein the cationic polymer is an aqueous dispersoid copolymerized from a cationic monomer, a (methyl) acrylate monomer and (methyl) styrene, and prepared by taking gelatine as a dispersing agent, taking a cationic and non-ionic compound surfactant as an emulsifying agent, taking 2,2'-azo-bis (amidino-propyl) dihydrochloride as an initiator, and performing free radical emulsion polymerization on the mixed monomers; the surface sizing agent emulsion comprises the following components in parts by weight: 80-90 parts of the AKD wax, 10-20 parts of the paraffin wax, 25-100 parts of the cationic polymer, 1-5 parts of glyoxal, and 270-610 parts of water, wherein the total of the AKD wax and the paraffin wax is100 parts by weight. The surface sizing agent emulsion provided by the invention is capable of obviously improving the hydrophobicity of paper and improving the surface strength of the paper.

The invention discloses high-performance sizing agent emulsion and a preparation method thereof. The preparation method comprises the following steps of: adding molten alkyl ketene dipolymer into a mixture of cationic polymer and water, stirring and homogenizing to obtain the sizing agent emulsion, wherein the cationic polymer is a product obtained by reacting a cationic monomer, cellulose, potassium hypermanganate, silane and sulfuric acid under the action of an initiator. The sizing agent emulsion is a high-performance and environment-friendly product for papermaking coatings. The product is applied to the internal sizing of paper, so that the hydrophobicity of the paper can be improved obviously, and a Cobb value can be reduced.

The invention provides a preparation method of a cationic starch / nano cellulose based water-resistant reinforced composite emulsion. The method includes the steps of: starch oxidation, preparation ofa mixed monomer, preparation of an initiator and reaction. The reaction includes: introducing oxidized starch into a reaction kettle, heating the oxidized starch, then adding an initiator A and an initiator B simultaneously; are dripped at the same time; 0.5-2min after adding of the initiator, starting adding of the mixed monomer; at the end of the reaction, adding texanol ester alcohol dropwise,and then performing cooling, thus obtaining the starch / nano cellulose based high water-resistant reinforced composite emulsion. The composite emulsion prepared by the method provided by the inventionhas reinforcement and water resistance functions simultaneously, also has good water resistant effect and significant reinforcement effect, and can obviously improve the paper quality and grade.

The invention discloses a high-performance sizing agent emulsion and a preparation method and an application thereof, and the preparation method comprises the following steps: mixing a cationic polymer and water, adding a molten alkyl ketene dimmer, stirring for homogenization to obtain the high-performance sizing agent emulsion, wherein the cationic polymer is prepared by allowing a cationic monomer, chitosan, hydrogen peroxide, silane and sulfuric acid to react under the action of an initiator. The high-performance sizing agent emulsion of the invention is a high-performance environment-friendly product which meets requirements of papermaking coatings. The product is applicable to the internal sizing of paper, and can significantly improve the hydrophobicity of paper, and decrease the Cobb value.

The invention provides a surface sizing agent used for corrugated paper as well as a preparation method and application thereof. The surface sizing agent used for corrugated paper is prepared by uniformly mixing a base material of the surface sizing agent used for corrugated paper and a cationic additive, wherein a preparation method of the base material of the surface sizing agent used for corrugated paper comprises the following steps of: adding cationic monomers, zircon salts, acrylate (methacrylate) monomers, styrene (methyl styrene), initiators, acetic acid and water to a reaction vessel to carry out free radical polymerization reaction, thus generating the base material of the surface sizing agent used for corrugated paper; a preparation method of the cationic additive comprises the following steps of: adding an alkyl ketene dimer to a water solution of cationic emulsifiers and fully stirring the materials to carry out emulsion dispersion, thus obtaining the cationic additive. The surface sizing agent prepared by the method provided by the invention not only can conduce to substantially reducing the Cobb value and can be rapidly cured and be basically cured immediately after coming off a machine but also can achieve the effect of substantially improving the ring crush strength of the corrugated paper under the condition that the dosage of the sizing agent is invariable.