CN111111548B - Silicon carbide hydraulic grading efficient surfactant - Google Patents
Silicon carbide hydraulic grading efficient surfactant Download PDFInfo
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- CN111111548B CN111111548B CN201911374734.5A CN201911374734A CN111111548B CN 111111548 B CN111111548 B CN 111111548B CN 201911374734 A CN201911374734 A CN 201911374734A CN 111111548 B CN111111548 B CN 111111548B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
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Abstract
The invention relates to a silicon carbide hydraulic grading high-efficiency surfactant. The composite material comprises the following raw materials in percentage by mass: 50-70% of deionized water, 15-20% of naphthalene sulfonate, 10-20% of water reducing agent, 1-3% of pH regulator and 0.1-3% of bacteriostatic agent. The surfactant can coat silicon carbide through the surfactant, so that silicon carbide particles are mutually repelled due to strong steric hindrance, the effect of dispersing silicon carbide particles is achieved, the particles are not easy to agglomerate, the potential of silicon carbide micro powder is obviously improved, the change of the viscosity of the sizing agent caused by the change of the environmental temperature and the water temperature is overcome, and the viscosity of the sizing agent is reduced.
Description
Technical Field
The invention relates to a silicon carbide hydraulic grading high-efficiency surfactant, belonging to the technical field of surfactants.
Background
The silicon carbide (SiC) is prepared by smelting quartz sand, petroleum coke (or coal coke), wood chips (salt is required when green silicon carbide is produced) and other raw materials in a resistance furnace at high temperature, has the advantages of high hardness, high elastic modulus, heat resistance, wear resistance, corrosion resistance and the like, has very wide application by utilizing the advantages of the silicon carbide (SiC), and particularly has irreplaceable effect in the field of cutting, grinding and polishing. In the processing process of the silicon carbide, the silicon carbide can reach a more ideal particle size after being crushed for a plurality of times, so the surface energy of the silicon carbide powder is higher, and agglomeration is easily caused. The difficulty encountered when dispersing silicon carbide particles is that the surface energy of the powder is high and the surface effect is strong, a large amount of micro particles are adsorbed on the surface of a single particle, the particles are easily agglomerated to form secondary particles, and the powder material cannot be effectively classified in the hydraulic classification process, so that the use section cutting and grinding performance of a terminal customer of the silicon carbide powder in the later period cannot be effectively exerted.
At present, the domestic mainstream dispersion technology mainly adopts common inorganic surfactants, such as: sodium tripolyphosphate, sodium pyrophosphate, water glass and the like, and a part of synthetic surfactants appear in the later period, but the requirements on the quality of products are improved, so that the synthetic surfactants are gradually not suitable for the current requirements. Therefore, it is urgent to find a highly effective surfactant. The naphthalene naphthenate and the water reducing agent adopted in the invention have dispersing effect, lubricating effect and surface steric hindrance effect on silicon carbide particles, and after the surfactant is added into silicon carbide powder slurry, because molecules of the surfactant can be directionally adsorbed on the surfaces of the particles, the surfaces of the particles are charged with the same kind of charges to form electrostatic repulsion effect, so that the particles are mutually dispersed, and a flocculation structure is disintegrated, thereby effectively increasing the fluidity of the slurry. The hydrophilic groups in the surfactant have strong polarity, so that the active agent adsorption film on the particle surface can form a stable solvated water film with water molecules, and the water film has good lubricating effect and can effectively reduce the sliding resistance among particles, thereby further improving the fluidity. The surfactant has hydrophilic branched chains in the structure and extends in an aqueous solution, so that a hydrophilic three-dimensional adsorption layer with a certain thickness is formed on the surface of adsorbed particles. When the particles are close to each other, the adsorption layers begin to overlap, namely steric hindrance is generated among the particles, and the larger the overlap is, the larger the steric hindrance repulsive force is, and the larger the obstruction to the interparticle coagulation is.
Disclosure of Invention
The invention aims to provide a silicon carbide hydraulic classification efficient surfactant which is a silicon carbide powder hydraulic classification dispersing agent with good performance and remarkable effect, has good dispersibility for hydraulic classification of silicon carbide powder, and improves classification efficiency.
In order to achieve the above object, the present invention has the following technical means.
The silicon carbide hydraulic grading high-efficiency surfactant comprises the following raw materials in parts by weight: 50-70% of deionized water, 15-30% of naphthalene sulfonate, 10-20% of water reducing agent, 1-3% of pH regulator and 0.1-3% of bacteriostatic agent.
Preferably, the naphthalene sulfonate is any one of sodium alpha-naphthalene sulfonate and sodium beta-naphthalene sulfonate.
Preferably, the water reducing agent is any one of powdery polycarboxylic acid ester, casein and polycarboxylic acid-based high-performance water reducing agent.
Preferably, the PH adjuster is any one of citric acid, lactic acid, and acetic acid.
Preferably, the bacteriostatic agent is any one of cason, 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one.
The invention has the beneficial effects that: 1) the surfactant for hydraulic classification of the silicon carbide powder comprises anionic surfactant sodium naphthalene sulfonate and polycarboxylic acid water reducing agent, molecular chains of the surfactant sodium naphthalene sulfonate and polycarboxylic acid water reducing agent have dispersing effect, lubricating effect, steric hindrance effect and slow release effect of graft copolymerization chains on silicon carbide particles in slurry, an adsorption film on the surface of the silicon carbide particles can form a stable solvated water film with water molecules to form a hydrophilic three-dimensional adsorption layer with a certain thickness, and the silicon carbide particles are mutually repelled due to the steric hindrance effect and cannot agglomerate to achieve a good dispersing effect; the steric effect provided by the chain grafted on the polycarboxylic acid molecule and the polycarboxylic acid with stronger dispersion function released by the chain cut under a certain pH value condition effectively improve the dispersion effect of the particles.
2) The bacteriostatic agent contained in the silicon carbide powder can effectively inhibit the breeding of bacteria in slurry in the classification process of the silicon carbide powder, the stability of hydraulic classification water is ensured, the viscosity of a slurry system is kept stable, a dispersion system is more stable, and the surfactant is ensured to continuously exert the function.
Detailed Description
The following description of specific embodiments of the present invention is provided in connection with examples to facilitate a better understanding of the present invention.
Example 1
The silicon carbide powder hydraulic classification high-efficiency surfactant comprises the following raw materials in parts by weight: 60% of deionized water, 15% of naphthalene sulfonate, 20% of water reducing agent, 3% of pH regulator and 2% of bacteriostatic agent. The naphthalenesulfonate is sodium alpha-naphthalenesulfonate, and the water reducing agent is a polycarboxylic acid water reducing agent.
Example 2
The silicon carbide powder hydraulic classification high-efficiency surfactant comprises the following raw materials in parts by weight: 60% of deionized water, 20% of naphthalene sulfonate, 15% of water reducing agent, 3% of pH regulator and 2% of bacteriostatic agent. The naphthalenesulfonate is sodium alpha-naphthalenesulfonate, and the water reducing agent is a polycarboxylic acid water reducing agent.
Example 3
The silicon carbide powder hydraulic classification high-efficiency surfactant comprises the following raw materials in parts by weight: 60% of deionized water, 20% of naphthalene sulfonate, 15% of water reducing agent, 3% of pH regulator and 2% of bacteriostatic agent. The naphthalenesulfonate is beta-sodium naphthalenesulfonate, and the water reducing agent is polycarboxylic acid water reducing agent.
Example 4
The silicon carbide powder hydraulic classification high-efficiency surfactant is characterized by comprising the following raw materials in parts by weight: 60% of deionized water, 15% of naphthalene sulfonate, 20% of water reducing agent, 3% of pH regulator and 2% of bacteriostatic agent. The naphthalenesulfonate is beta-sodium naphthalenesulfonate, and the water reducing agent is casein.
Example 5
The silicon carbide powder hydraulic classification high-efficiency surfactant comprises the following raw materials in parts by weight: 55% of deionized water, 20% of naphthalene sulfonate, 20% of water reducing agent, 3% of pH regulator and 2% of bacteriostatic agent. The naphthalenesulfonate is sodium alpha-naphthalenesulfonate, and the water reducing agent is a polycarboxylic acid water reducing agent.
Example 6
The silicon carbide powder hydraulic classification high-efficiency surfactant comprises the following raw materials in parts by weight: 55% of deionized water, 20% of naphthalene sulfonate, 20% of water reducing agent, 3% of pH regulator and 2% of bacteriostatic agent. The naphthalenesulfonate is beta-sodium naphthalenesulfonate, and the water reducing agent is casein.
The surfactants prepared in examples 1 to 6 were compared with surfactants such as sodium pyrophosphate, sodium tripolyphosphate and water glass in a laboratory by preparing an aqueous solution of silicon carbide powder (using silicon carbide powder of D3:12.61 μm, D50: 7.46 μm and D94: 4.53 μm) at a concentration of 30% in a graduated beaker, adding the same amount of dispersant to the system, and sufficiently stirring to observe the following phenomena:
the settling time is: the time required for the same material to settle to a certain level in a graduated beaker.
The turbidity is: and (3) settling the materials with the same concentration for the same time, and comparing the turbidity of the system with the settling distance of the materials.
The hardness of the precipitated material is: and after the material sedimentation is finished, testing the hardness condition of the settled material.
And (3) viscosity measurement: the viscosity of the system was measured with a viscometer at a constant temperature of 25 ℃.
The phase separating agents prepared in examples 1 to 6, sodium pyrophosphate, sodium tripolyphosphate, water glass and the like are applied to comparative tests in actual production (the silicon carbide powder raw materials adopted are D3:12.61 microns, D50: 7.46 microns and D94: 4.53 microns). The effect pairs are as follows:
| species of | Proportion of addition | Time of classification | Remarks for note |
| Sodium tripolyphosphate | 0.5‰ | 162.5 hours | |
| Pyrophosphoric acid sodium salt | 0.5‰ | 150.3 hours | |
| Water glass | 0.5‰ | 143.5 hours | |
| The surfactant of the present invention | 0.5‰ | 120.5 hours |
The classification time refers to the total time from the first number of hydraulic classification to the end of the hydraulic classification when the same raw materials are put into the same classification equipment for classification
In the surfactant formula provided by the invention, each component and the dosage thereof are specific, and when a certain component is lacked or the dosage of a certain component exceeds the specified dosage, the capability of the surfactant is reduced to different degrees.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (1)
1. The silicon carbide hydraulic classification surfactant is characterized by comprising the following raw materials in parts by weight: 50-70% of deionized water, 15-30% of naphthalenesulfonate, 10-20% of water reducing agent, 1-3% of PH regulator and 0.1-3% of bacteriostatic agent, the naphthalenesulfonate is any one of alpha-sodium naphthalenesulfonate and beta-sodium naphthalenesulfonate, the water reducing agent is any one of powder casein and powder polycarboxylic acid water reducing agent, the PH regulator is any one of citric acid, lactic acid and acetic acid, and the bacteriostatic agent is any one of kasong, 5-chloro-2-methyl-4-isothiazoline-3-ketone and 2-methyl-4-isothiazoline-3-ketone.
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