1. Use
This agent is a corn starch adhesive composed of corn starch as the main raw material, adding sodium hydroxide, potassium pyroantimonate, borax and other auxiliary materials. It is mainly used in carton, corrugated board and other industries. This agent can replace the long-used alkaline styrofoam (i.e., water glass) adhesive, the advantages are: simple production equipment, easy to make, fast production, high bonding strength, moisture resistance than styrofoam is also good, and the amount of coated and the cost is lower than styrofoam adhesive.
2. raw materials
(1) corn starch: corn kernels are processed to meet the following quality requirements:
Appearance: white or yellowish powder
Moisture (%): ≤14
Protein (%): ≤0.5
Ash (%): ≤0.05
Acid (per 100 grams of dry). Acidity (0.1 mole sodium hydroxide per 100 grams of dry starch): ≤15
Fineness (through 100 sieve) (%): ≥99
Spots (p/cm2): 1
Odor: normal
(2) Sodium hydroxide: also known as caustic soda, caustic soda. White solid, in the form of granules, flakes, rods or blocks. It is a strong alkali, with strong corrosiveness to skin, fabric, paper and so on. Strong hygroscopicity, easy to absorb water and carbon dioxide in the air and gradually become sodium carbonate. Easily soluble in water, at the same time strongly exothermic, widely used in paper, rayon, dyeing, soap, oil and other chemical industries. Used as pH adjusting agent. Selected industrial products.
(3) borax: scientific name sodium tetraborate decahydrate, sodium pyroborate. Molecular formula Na2B4O7-10H2O. colorless translucent crystals or crystalline powder. Odorless, sweet and astringent taste. Weathering in the air, the crystal surface is often covered with white powder. 16 ml of cold water, 0.6 ml of boiling water or 1 ml of glycerol can dissolve 1 g of borax, insoluble in ethanol. The aqueous solution has an alkaline reaction. It is mainly used in glass and enamel industry, and used as antiseptic and disinfectant in medical treatment. Used as a preservative in this agent. Selected industrial products.
(4) Potassium pyroantimonate: white granules or crystalline powder. Soluble in hot water, slightly soluble in cold water, insoluble in ethanol. Oxidizing and stabilizing effects in this agent. Selected industrial products.
3. Formulation (weight)
Corn starch 50 Potassium pyroantimonate 1 Borax 6.5 Solid sodium hydroxide 18
4. Preparation method
Corn is made into corn starch similar to ordinary flour by the process of soaking, separating, washing, milling, dehydrating and so on, weighed 50 parts of its weight, and modulated into corn starch award with 133 parts of water. Gelatinized with aqueous sodium hydroxide solution (18 parts of sodium hydroxide dissolved in 30 parts of water), mixed at 70 ℃ for 30 minutes, and mixed with 300 parts of cold water, stirring well to obtain liquid A.
In another container with 40 parts of water to dissolve 1 part of potassium pyroantimonate, stirring to dissolve, and then diluted with 1,000 parts of 35 ℃ of water, and mixed with 6.5 parts of borax and 500 parts of corn starch to get B. In 30 minutes, A and B are combined, mixed and stirred for 15 minutes to obtain a starch binder with excellent storage properties.
5. Precautions
(1) The ratio of starch to water should be appropriate. Too much water will reduce the viscosity, too little will affect the fluidity.
(2) The fineness of starch should be as fine as possible. If it is lower than 99 mesh, the starch is not easy to decompose and oxidize, resulting in unqualified products.
(3) The amount of sodium hydroxide added should be controlled, not too much, otherwise the viscosity of the product decreases.
(4) bubbles in the operation, mainly due to the reaction of the material is not the right ratio or the reaction time is too short, can be added to the appropriate amount of antifoaming agent silicone oil or re-reaction.
(5) Sodium hydroxide has strong corrosive, and can burn the skin, must pay attention to the use.
Milky white glue, also known as polyvinyl acetate emulsion, generally vinyl acetate as the main raw material, ammonium persulfate as an initiator, at a temperature of about 80 ℃ will be vinyl acetate monomer polymerization and produced a milky white viscous liquid, is a very wide range of uses of adhesives.
Water-resistant emulsion glue Inventor: Liu Jingfen
Address: No. 4, Qinglong Road, Xi'an Plaza, Changchun City, Jilin Province, 130062
Introduction: a kind of water-resistant emulsion glue consisting of vinyl acetate, styrene, butyl acrylate, acrylic acid, emulsifier OP, sodium dodecyl sulfate, emulsifier S, ammonium persulfate, sodium carbonate, thickening agent NA, zinc acetate and water. The water-resistant emulsion glue is made by polymerizing vinyl acetate with water-resistant monomers*** and further improving the water-resistance through the room temperature cross-linking technology, the process is to be polymerized after mixing the monomers, emulsification, initiation, stabilization and other processes are completed, and the process is simple, easy to operate, the product has excellent water resistance, easy to use, and the same method of use as the ordinary emulsion glue, and the materials to be bonded with water-resistant
Key point: a water-resistant emulsion glue composed of vinyl acetate, styrene, butyl acrylate, acrylic acid, emulsifier OP, sodium dodecyl sulfate, emulsifier S, ammonium persulfate, sodium carbonate, thickening agent NA, zinc acetate, and water, characterized in that: according to the percentage of the material to take vinyl acetate 10-30%, styrene 10-30%, butyl acrylate, emulsifier S, ammonium persulfate, sodium carbonate, thickening agent S, ammonium persulfate, sodium carbonate, thickening agent S, zinc acetate, and water. 30%, butyl acrylate 5-15%, acrylic acid 0.5-4%, emulsifier OP 0.2-2%, sodium dodecyl sulfate 0.1-1%, emulsifier S 0.2-2%, ammonium persulfate 0.1-1%, sodium carbonate 0.1-1%, sodium carbonate 0.1-1%, and water. -1%, sodium carbonate 0.001-0.1%, thickener NA 0.1-2%, zinc acetate 0.05-1%, water 20-60%; the process is: vinyl acetate, styrene, butyl acrylate, Acrylic acid made of mixed monomers; with hot water to dissolve the emulsifier OP, sodium dodecyl sulfate, emulsifier S. The emulsifier solution for the emulsion; with hot water to dissolve ammonium persulfate, made of dissolution initiator; in the enameled reactor, add water, add sodium carbonate, thickening agent NA, dissolved; mixed monomers with emulsion, the emulsion will be added to the reactor with steam to raise the temperature; water to dissolve ammonium persulfate, take out the portion of the initiator solution; in the kettle, mixed monomers, will be added to the reactor with steam to warm up; water to dissolve the ammonium persulfate, remove part of as the initiator solution; add the initiator to the reactor when the temperature in the kettle rises; a part of the remaining initiator solution is added to the emulsified monomer; when the initiation of polymerization, the polymerization reaction is continued at a temperature of 70 ° C to 90 ° C, and the emulsified monomer is added continuously. Additional monomer is completed within two hours; after the monomer is added, the temperature is raised to 70-90 ℃ and kept for two hours; acetic acid is added; the temperature is lowered and filtered.