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CN-118184368-B - Adhesive suitable for refractory material and preparation process and application thereof

CN118184368BCN 118184368 BCN118184368 BCN 118184368BCN-118184368-B

Abstract

The invention relates to the technical field of binders, in particular to a binder suitable for refractory materials, and a preparation process and application thereof. The binder suitable for the refractory material is prepared from, by weight, 30-40 parts of dispersible sulfonated starch ether, 20-30 parts of sodium naphthalene sulfonate formaldehyde condensate, 3-5 parts of hydroxypropyl methyl cellulose, 5-10 parts of sodium bentonite, 3-5 parts of fumed silica and 1-3 parts of polyvinyl alcohol. The adhesive is mainly prepared from the following raw materials by adding the dispersible sulfonated starch ether into the main raw materials, wherein when the dispersible sulfonated starch ether is matched with the raw materials, the strength of a refractory product can be improved firstly, and secondly, when the adhesive is added into the refractory material for molding, the cracking condition of the thick refractory material during drying or sintering can be avoided, and the prepared refractory product has fewer cracks at edges and corners.

Inventors

  • FANG GUOFU
  • LIU AIGUO

Assignees

  • 佛山市国方纤维材料科技有限公司

Dates

Publication Date
20260508
Application Date
20240314

Claims (6)

  1. 1. A preparation process of a binder suitable for refractory materials is characterized in that, Adding dispersible sulfonated starch ether, sodium naphthalene sulfonate formaldehyde condensate, hydroxypropyl methyl cellulose, sodium bentonite, fumed silica and polyvinyl alcohol into ball milling equipment, performing dry ball milling to 38-58 mu m, and then placing the ball milled raw materials into crushing equipment to be crushed to 13-23 mu m to obtain the binder suitable for refractory materials; The adhesive suitable for the refractory material is prepared from, by weight, 30-40 parts of dispersible sulfonated starch ether, 20-30 parts of sodium naphthalene sulfonate formaldehyde condensate, 3-5 parts of hydroxypropyl methyl cellulose, 5-10 parts of sodium bentonite, 3-5 parts of fumed silica and 1-3 parts of polyvinyl alcohol, wherein the dispersible sulfonated starch ether is prepared from, by weight, 25-35 parts of corn starch, 5-10 parts of tapioca starch, 5-10 parts of yellow dextrin, 5-8 parts of sodium lignin sulfonate, 2-4 parts of caustic soda flakes, 6-8 parts of methanol and 6-8 parts of chloroacetic acid, the pH value of the sodium naphthalene sulfonate formaldehyde condensate is 7.6-7.8, the sodium sulfate content in the sodium naphthalene sulfonate formaldehyde condensate is 18.5-19.5%, and the chloride ion content is 0.18-0.5%.
  2. 2. The process for preparing a binder for refractory materials according to claim 1, wherein the preparing step of the dispersible sulfonated starch ether comprises: Placing the corn starch, the tapioca starch, the yellow dextrin and the sodium lignin sulfonate into equipment according to a proportion, mixing and homogenizing for 25-35min to obtain a first mixture; Adding the caustic soda flakes into the first mixture, stirring uniformly, adding the methanol while stirring, and performing an alkalization reaction in a water bath state for 35-45min to obtain a second mixture; And (3) adding chloroacetic acid into the second mixture for etherification, heating to 75-80 ℃ during etherification, cooling to room temperature after reacting for 60-70min, and sieving with a 60-mesh sieve to obtain the dispersible sulfonated starch ether.
  3. 3. A process for the preparation of a binder for refractory materials as claimed in claim 2 wherein the water bath temperature is 33-38 ℃ in the water bath.
  4. 4. The process for preparing a binder for refractory materials according to claim 1, wherein the hydroxypropyl methylcellulose has a viscosity of 40000-60000 mpa.s -1 and a pH of 6-7, and the hydroxypropyl methylcellulose has a methoxy content of 25-30% and a hydroxypropoxy content of 10-13%.
  5. 5. The process for preparing a binder for refractory materials according to claim 1, wherein the particle size ranges of the sodium naphthalene sulfonate formaldehyde condensate and the hydroxypropyl methylcellulose are 180 to 380 μm, the particle size range of the sodium bentonite is 80 to 150 μm, the particle size range of the fumed silica is 5 to 45nm, and the particle size range of the polyvinyl alcohol is 100 to 150 μm.
  6. 6. The process for preparing a binder for refractory materials according to claim 1, wherein the fumed silica has a bulk density of 200-400g/dm 3 and a pore volume of 0.1-1cm 3 /g.

Description

Adhesive suitable for refractory material and preparation process and application thereof Technical Field The invention relates to the technical field of binders, in particular to a binder suitable for refractory materials, and a preparation process and application thereof. Background Refractory materials are processes in which raw materials such as refractory silica are processed into finished products of a predetermined size and shape by means of external forces and a mold. In recent years, new energy automobiles and energy storage technologies are continuously developed, upstream positive and negative electrode material production enterprises and nonferrous metal enterprises such as lithium carbonate, cobalt, nickel and the like use a large amount of refractory materials as carriers in the production processes of purification, smelting, roasting and the like, along with the continuous development of the refractory materials, the requirements of various fields on the refractory materials are continuously improved, and the formed refractory materials are required to meet the following requirements of (1) shape, size and precision, meet the design requirements, (2) have uniform and compact structure, have no cracks on the surface and the inside, and (3) have enough mechanical strength, and (4) meet the expected physical performance requirements. However, the traditional organic binder is mostly adopted in the process of forming the refractory material, and the traditional organic binder has the characteristics of poor dispersibility, low density of pressed products in the process of forming, large dosage and higher cost. Disclosure of Invention The invention mainly aims to provide a binder suitable for refractory materials, a preparation process and application thereof, and aims to solve the technical problems that the conventional organic binder is adopted in the conventional refractory materials, the refractory materials are easy to deform and crack, and the mechanical strength is low. The invention provides a binding agent suitable for refractory materials, which is prepared from, by weight, 30-40 parts of dispersible sulfonated starch ether, 20-30 parts of sodium naphthalene sulfonate formaldehyde condensate, 3-5 parts of hydroxypropyl methyl cellulose, 5-10 parts of sodium bentonite, 3-5 parts of fumed silica and 1-3 parts of polyvinyl alcohol. The raw materials for preparing the binder comprise conventional fumed silica, hydroxypropyl methylcellulose, polyvinyl alcohol and the like, and special sodium naphthalene sulfonate formaldehyde condensate and sodium bentonite are also introduced, wherein the sodium naphthalene sulfonate formaldehyde condensate is mostly used as a water reducing agent of cement, the sodium naphthalene sulfonate formaldehyde condensate is used as a main raw material of the binder, and the introduction of the sodium bentonite can improve the plasticity and strength of the refractory material. In addition, the main raw materials of the adhesive are further added with the dispersible sulfonated starch ether, the dispersible sulfonated starch ether is prepared by adopting the following raw materials and a preparation process, when the dispersible sulfonated starch ether is matched with the raw materials, firstly, the strength of a refractory material product can be improved, and secondly, when the adhesive is added into the refractory material for molding, the cracking condition of the thick refractory material during drying/firing can be avoided, for example, the cracking of finished products such as the prepared thick refractory bricks/refractory sagger and the like at edges and corners is less. In addition, the adhesive obtained by the scheme has good adaptability in various refractory materials, and can be used together with other additives of the refractory materials. Preferably, the dispersible sulfonated starch ether is prepared from the following raw materials, by weight, 25-35 parts of corn starch, 5-10 parts of tapioca starch, 5-10 parts of yellow dextrin, 5-8 parts of sodium lignin sulfonate, 2-4 parts of caustic soda flakes, 6-8 parts of methanol and 6-8 parts of chloroacetic acid. Preferably, the preparation method of the dispersible sulfonated starch ether comprises the steps of mixing and homogenizing the corn starch, the tapioca starch, the yellow dextrin and the sodium lignin sulfonate in equipment for 25-35min according to a proportion to obtain a first mixture; Adding the caustic soda flakes into the first mixture, stirring uniformly, adding the methanol while stirring, and performing an alkalization reaction in a water bath state for 35-45min to obtain a second mixture; And (3) adding chloroacetic acid into the second mixture for etherification, heating to 75-80 ℃ during etherification, cooling to room temperature after reacting for 60-70min, and sieving with a 60-mesh vibrating screen to obtain the dispersible sulfonated starch ether. The room temperature of the