Adhesive and preparation method

A technology of adhesives and cross-linking agents, applied in the direction of adhesives, adhesive types, grafted polymer adhesives, etc., can solve problems such as slow dissolution rate, poor coater runability, poor rheology of coatings, etc. Achieve the effect of improving the water resistance of the coating, improving the running performance and strong adhesion

Inactive Publication Date: 2014-11-19
GOLD EAST PAPER JIANGSU
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Powdered bio-latex mainly uses a screw extruder to modify and grind starch under high temperature and high pressure. The equipment is relatively complicated and consumes a lot of energy, and the powdered bio-latex needs to be fully dissolved in use. It will also dissolve if it is directly added to the paint. Slow rate, inconvenient configuration, poor rheology of coatings; in addition, some simple modified starch derivatives also have high viscosity, instability, poor fluidity, easy gelation, strong hydrophilicity, low bond strength, etc. shortcoming
The solid content of liquid biological latex is mostly 45-50%. As an adhesive, it can only partially replace synthetic styrene-butadiene latex. The substitution amount is generally below 20%. increase, the operation of the coating machine will become worse, and related patents and experimental results show that the film-forming strength and hydrophobicity of this type of bio-latex are poor

Method used

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  • Adhesive and preparation method
  • Adhesive and preparation method

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preparation example Construction

[0026] The invention provides the preparation method of this kind adhesive, it comprises the steps:

[0027] (1) Thoroughly mix 100 parts by mass of starch or starch derivatives with water, then add 5-40 parts by mass of film-forming aids and keep them at the starch gelatinization temperature (80-90°C) to make the starch fully Gelatinization to obtain a mixed solution; this step is preferably carried out under the protection of an inert gas (nitrogen) to improve the reaction efficiency and reduce the generation of by-products. In this step, if the polymer of starch or starch derivatives is not in the range of 10-200, it is also necessary to add 0.5-5 mass parts of molecular weight regulators to carry out chain scission of starch or starch derivatives when adding film-forming aids , Viscosity reduction treatment to make starch or starch derivatives reach the required molecular weight.

[0028] (2) Adjust the pH value of the mixed solution to 5.0-8.0, and this step can be adjus...

Embodiment 1

[0041] Please refer to Table 1 for the formula of the adhesive.

[0042] Table I

[0043]

[0044] Preparation of adhesive: Add 90% of the calculated amount of water and tapioca starch into a four-neck flask, stir evenly under nitrogen protection, add α-amylase and propylene glycol and stir thoroughly, heat up to 90°C and gelatinize for 30 minutes; add sodium hydroxide Adjust the pH to 6.0 and dissolve ammonium persulfate with 10% calculated amount of water; add OP-10 and 20% initiator solution (ammonium persulfate aqueous solution) into a four-necked flask; n-butyl ester and methacrylic acid) and the remaining 80% ammonium persulfate aqueous solution were added dropwise to the four-necked flask, the rate of addition was controlled at 1 hour, the reaction temperature was controlled at 60°C, and the graft copolymerization reaction was carried out for 5 hours; The cross-linking agent phosphorus oxychloride is added to the polymerized copolymer emulsion, and the temperature i...

Embodiment 2

[0046] Please refer to Table 2 for the formula of the adhesive.

[0047] Table II

[0048]

[0049] Preparation of adhesive: Add 80% of the calculated amount of water and tapioca starch into a four-neck flask, stir well under nitrogen protection, add α-amylase and sorbitol and stir thoroughly, heat up to 90°C and gelatinize for 30 minutes; add carbonic acid Sodium hydrogen adjusts the pH to about 7.5; Potassium persulfate and sodium dodecylsulfate are dissolved in 20% calculated amount of water; Add sodium dodecylsulfate aqueous solution and 20% initiator solution (potassium persulfate aqueous solution) into a four-necked flask; the monomers (ie, methyl methacrylate, styrene, n-butyl acrylate, n-octyl methacrylate, and acrylic acid) and the remaining 80% potassium persulfate aqueous solution were added dropwise to the four-necked flask In the process, the dropping rate was controlled at 3 hours, the reaction temperature was controlled at 80°C, and the graft copolymerizatio...

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Abstract

Provided is an adhesive. The adhesive comprises, by weight, crosslinking products of starch grafting monomer polymers and 0.5-10 parts of cross-linking agents, 5-40 parts of film forming auxiliary agents, 0.5-5 parts of emulsifiers and water. The starch grafting monomer polymers are mainly prepared through reaction of by weight, 100 parts of starch or starch derivatives, 0.2-3 parts of initiators and 30-150 parts of grafting monomers. The polymerization degree of the starch or the starch derivatives is 10-200. The starch grafting monomers comprise three kinds of monomers of hard monomers, soft monomers and functional monomers. The invention also provides a preparation method for the adhesive. The adhesive can meet the coating paper intensity requirements under conditions of replacement or substitution of styrene-butadiene latex with high proportion the binding performance is strong, the water risistance of the coating layer is raised, the paint rheological property approaches the paint rheological property of synthetic latex, and running properties of a coating machine are raised.

Description

technical field [0001] The invention relates to an adhesive used in the field of papermaking and a preparation method thereof. Background technique [0002] At present, the amount of pigment-coated processed paper in the paper industry is relatively large. The main components of coated paper coatings are pigments, adhesives and other additives. In base paper pre-coating, the adhesive is mainly synthetic styrene-butadiene latex and a certain proportion of coating starch, while almost all synthetic styrene-butadiene latex is used in the top coating. With the shortage of energy, rising oil prices and the continuous development of the automobile industry, the price of butadiene, the main synthetic component of styrene-butadiene latex, has also increased. Therefore, it is very necessary to develop a biological latex that can replace synthetic styrene-butadiene latex. Bio-latex is made from abundant natural high-molecular carbohydrates such as starch, which are modified by phys...

Claims

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Application Information

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IPC IPC(8): C09J151/02C08F251/00
Inventor 王仁荣张明王春雁李俊刘春
Owner GOLD EAST PAPER JIANGSU
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