CN113443886A - Preparation method of corrosion-resistant ceramic gypsum mold - Google Patents
Preparation method of corrosion-resistant ceramic gypsum mold Download PDFInfo
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- CN113443886A CN113443886A CN202110819250.8A CN202110819250A CN113443886A CN 113443886 A CN113443886 A CN 113443886A CN 202110819250 A CN202110819250 A CN 202110819250A CN 113443886 A CN113443886 A CN 113443886A
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- gypsum
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00939—Uses not provided for elsewhere in C04B2111/00 for the fabrication of moulds or cores
Abstract
The invention provides a preparation method of a corrosion-resistant ceramic gypsum mold, which comprises the following steps: the method comprises the steps of dry mixing phosphate, cement, an organic additive and the ceramic mould gypsum powder uniformly, adding water, stirring, and standing to obtain the ceramic gypsum mould, wherein the adding proportions of the phosphate, the cement and the organic additive are respectively 0.1-0.5 wt.%, 0.1-1.5 wt.% and 0.3-0.5 wt.% based on 100 wt.% of the ceramic mould gypsum powder. According to the preparation method of the ceramic gypsum mold, provided by the invention, on the premise that the mechanical and water absorption properties of the gypsum are maintained, the corrosion action of an electrolyte solution on the gypsum can be greatly and effectively reduced by adding the phosphate, the cement and the organic additive, the service life of the gypsum is prolonged, the cost is reduced, and the economic benefit is improved.
Description
Technical Field
The invention belongs to the technical field of gypsum molds, relates to preparation of ceramic gypsum molds, and particularly relates to a preparation method of a corrosion-resistant ceramic gypsum mold.
Background
China is a large country for ceramic production and export, and the total amount and types of ceramic products in external trade are increased every year. At present, most domestic large-scale ceramic enterprises use beta semi-hydrated gypsum as a raw material of a gypsum mold, the theoretical water demand rate is less than 20%, but the industrial requirement of the water demand rate is about 70% so as to meet the requirement of the gypsum mold on the porosity, because the mold contains excessive water, the semi-hydrated gypsum is converted into the dihydrate gypsum, and the gypsum porosity is increased along with the evaporation of the gypsum hardening process, a porous and loose structure is generated, the structure is easy to wet the gypsum, the water enters the interior through multiple holes, and the adhesiveness and the stability of gypsum crystal particles are reduced. Under the condition of excessive moisture and humidity, the gypsum is easy to corrode and dissolve, the strength and the service life are greatly reduced, the production cost of the ceramic of an enterprise is increased, and the economic benefit is lowered. Under the condition of increasing market competition, the problem to be solved by enterprises is to improve the product quality to reduce the cost and obtain more markets.
The gypsum mould usually has the problems of damage, rough surface, reduced strength and easy scrapping in the recycling process, after the gypsum mould is used for more than 30 times, the efficiency is reduced due to the reduction of water absorption, the corrosion rate is improved, the efficiency is reduced, the corrosion rate is not in accordance with the requirement of a grouting process, the mould is damaged due to the fatigue damage of slurry in the repeated use, and the damage and the scrapping of the mould are accelerated due to the generated mechanical action such as friction and the like. By using a new gypsum mold, the success rate of the blank body is reduced, the surface is not smooth any more, the blank needs to be repaired at a later stage, and the excessive and frequent replacement of the mold not only causes huge economic loss but also causes waste of gypsum resources.
CN105503124A discloses an alumina silicate fiber gypsum mould and a preparation method thereof, and the preparation method comprises the following steps: 1) soaking gypsum, bamboo charcoal and vermiculite in hydrochloric acid solution, filtering, and cleaning to obtain filter cake; 2) calcining the filter cake at 150-700 ℃ to obtain a calcined product; 3) mixing the calcined product, quicklime, aluminum silicate fiber, bauxite powder, water glass, slag powder, silicon carbide whisker and zinc borate to prepare a gypsum material; 4) and mixing the gypsum material with water to prepare gypsum slurry, coating the gypsum slurry on a clay sculpture model, and finally drying in the shade and demolding to prepare the aluminum silicate fiber gypsum mold. The gypsum mold prepared by the method has excellent flexural strength and impact resistance.
CN107117920A discloses a preparation method of a corrosion-resistant long-life gypsum mould. The method takes alpha-type and beta-type semi-hydrated gypsum as raw materials, inorganic solid waste comprising fly ash, construction waste, ceramic waste residue or furnace slag as an additive and polyvinyl alcohol or sodium polycarboxylates as an auxiliary material to prepare the corrosion-resistant long-life gypsum mould. The prepared gypsum mold has the advantages of high water absorption, convenience in manufacturing, high strength, long service life and low corrosion rate, the using times of the prepared gypsum mold reach 80-100 times, the service life of the prepared gypsum mold is prolonged by more than 60% compared with that of the traditional gypsum mold, and the prepared gypsum mold can be widely applied to various fields such as sanitary ceramics; the preparation method of the invention adopts the inorganic additive comprising the fly ash, the construction waste, the ceramic waste residue or the furnace slag, consumes the inorganic solid waste and reduces the pressure of the environment.
CN103360012B discloses a gypsum mold for ceramic slip casting, which comprises the following raw materials: porous pitch carbon: gypsum slurry; the gypsum slurry is formed by dissolving gypsum powder in water; wherein the weight percentage of the porous asphalt carbon to the gypsum powder is 1: 0.8 to 3. The invention also provides a preparation method of the gypsum mold. The gypsum mold prepared by the method has obviously improved 2h wet breaking strength, 2h wet compression strength and water absorption. Meanwhile, the gypsum mold prepared by the invention has excellent corrosion resistance and wear resistance.
In the ceramic production grouting, a factory adds a small amount of Na while injecting the slurry2SiO3To improve the fluidity of the slurry, but the gypsum mold will be mixed with Na2SiO3The reaction causes the corrosion of gypsum to generate CaSiO3Also can block the porous structure of the die to reduce the porosity, wherein part of the reaction generates alkali hair on the surface of the die to accelerate the die to be scrapped, and CaSiO in the die3Destroy the crystal structure of gypsum and reduce the service life. At present, a great deal of research is carried out on the modification of the ceramic mould powder at home and abroad, the indexes such as strength, water absorption, corrosion resistance and the like are improved, and although some technologies greatly improve the corrosion resistance, the water absorption rate of the gypsum is greatly reduced. In view of the above, it is desirable to provide a method for preparing a corrosion-resistant ceramic gypsum mold.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation method of a corrosion-resistant ceramic gypsum mold, and on the premise that the mechanical and water absorption properties of gypsum can be maintained, the corrosion action of an electrolyte solution on the gypsum can be greatly and effectively reduced by adding phosphate, cement and an organic additive, the service life of the gypsum is prolonged, the cost is reduced, and the economic benefit is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of a corrosion-resistant ceramic gypsum mold, which comprises the following steps: the method comprises the steps of dry mixing phosphate, cement, organic additive and ceramic mould gypsum powder uniformly, adding water and stirring, and standing to obtain the ceramic gypsum mould, wherein the adding proportion of the phosphate is 0.1-0.5 wt.%, and is 0.1 wt.%, 0.15 wt.%, 0.2 wt.%, 0.3 wt.%, 0.32 wt.%, 0.35 wt.%, 0.37 wt.%, 0.39 wt.%, 0.4 wt.%, 0.42 wt.%, 0.45 wt.%, 0.47 wt.%, 0.49 wt.%, and 0.5 wt.%, based on 100 wt.% of the mass of the ceramic mould gypsum powder, but not limited to the recited values, and other non-recited values in the numerical value range are also applicable.
The proportion of the cement added is 0.1 to 1.5 wt.%, and may be, for example, 0.1 wt.%, 0.2 wt.%, 0.3 wt.%, 0.4 wt.%, 0.5 wt.%, 0.6 wt.%, 0.7 wt.%, 0.8 wt.%, 0.9 wt.%, 1.0 wt.%, 1.1 wt.%, 1.2 wt.%, 1.3 wt.%, 1.4 wt.%, 1.5 wt.%, but is not limited to the recited values, and other values not recited within the range of values are also applicable.
The organic admixture is added in a proportion of 0.3 to 0.5 wt.%, and may be, for example, 0.3 wt.%, 0.32 wt.%, 0.35 wt.%, 0.37 wt.%, 0.39 wt.%, 0.4 wt.%, 0.42 wt.%, 0.45 wt.%, 0.47 wt.%, 0.49 wt.%, 0.5 wt.%, but is not limited to the recited values, and other values not recited in the numerical ranges are also applicable.
According to the preparation method of the ceramic gypsum mold, provided by the invention, on the premise that the mechanical and water absorption properties of the gypsum are maintained, the corrosion action of an electrolyte solution on the gypsum can be greatly and effectively reduced by adding the phosphate, the cement and the organic additive, the service life of the gypsum is prolonged, the cost is reduced, and the economic benefit is improved. The addition ratios of phosphate, cement, an organic additive and the ceramic mould gypsum powder are respectively limited to 0.1-0.5 wt.%, 0.1-1.5 wt.% and 0.3-0.5 wt.%, because when the addition ratio of the phosphate exceeds a selected range, the hydration action of the hemihydrate gypsum is influenced, so that gypsum crystals are coarsened and the strength of a gypsum mould is reduced, and when the addition ratio is lower than the selected range, the ion exchange process of an electrolyte solution cannot be effectively reduced; when the addition proportion of the cement exceeds a selected range, the integrity and the water absorption performance of the gypsum body are influenced, so that the water absorption rate is reduced, and when the addition proportion is lower than the selected range, the dissolving and recrystallization effects of the gypsum cannot be effectively reduced; when the adding proportion of the external additive exceeds the selected range, the additive has strong water-retaining effect and is not easy to dry, and the film-forming effect of the additive can influence the water-absorbing effect of gypsum body capillary pores, so that the water-absorbing performance is reduced, and when the adding proportion is lower than the selected range, the corrosion action of electrolyte can not be effectively hindered.
As a preferable technical scheme of the invention, the phosphate comprises one or a combination of at least two of trisodium phosphate, sodium tripolyphosphate or sodium hexametaphosphate.
As a preferable technical scheme of the invention, the cement comprises portland cement or aluminate cement.
As a preferable technical scheme of the invention, the cement specifically comprises one or a combination of at least two of ordinary portland cement, slag portland cement, fly ash portland cement or sulphoaluminate cement.
In a preferred embodiment of the present invention, the organic admixture comprises one or a combination of at least two of carboxymethyl cellulose, polyvinyl alcohol, and hydroxypropyl methyl cellulose ether.
In a preferred embodiment of the present invention, the polymerization degree of the organic admixture is 500 to 2000, and may be, for example, 500, 600, 700, 800, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 2000, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In a preferred embodiment of the present invention, the particle size of the organic admixture is 200 to 500. mu.m, for example, 200. mu.m, 220. mu.m, 240. mu.m, 260. mu.m, 280. mu.m, 300. mu.m, 350. mu.m, 370. mu.m, 390. mu.m, 400. mu.m, 420. mu.m, 440. mu.m, 460. mu.m, and 500. mu.m, but the invention is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
In a preferred embodiment of the present invention, the time for the standing is 2 to 4min, for example, 2min, 2.2min, 2.4min, 2.6min, 2.8min, 3.0min, 3.2min, 3.4min, 3.6min, 3.8min, 4min, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
In a preferred embodiment of the present invention, the stirring time is 3 to 5min, for example, 3min, 3.2min, 3.4min, 3.6min, 3.8min, 4min, 4.2min, 4.4min, 4.6min, 4.8min, and 5min, but the stirring time is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
In a preferred embodiment of the present invention, the rotation speed of the stirring is 500 to 600r/min, for example, 500r/min, 510r/min, 520r/min, 530r/min, 540r/min, 550r/min, 560r/min, 570r/min, 580r/min, 590r/min, and 600r/min, but is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned range are also applicable.
Compared with the prior art, the invention has the beneficial effects that:
according to the preparation method of the ceramic gypsum mold, provided by the invention, on the premise that the mechanical and water absorption properties of gypsum are maintained, the corrosion effect of an electrolyte solution on the gypsum can be greatly and effectively reduced by adding phosphate, cement and an organic additive, the service life of the gypsum is prolonged, the cost is reduced, and the economic benefit is improved.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments.
In one embodiment, the present invention provides a method for preparing a corrosion-resistant ceramic gypsum mold, the method comprising: the method comprises the steps of dry mixing phosphate, cement, organic additive and ceramic mould gypsum powder uniformly, adding water and stirring, and standing to obtain the ceramic gypsum mould, wherein the adding proportion of the phosphate is 0.1-0.5 wt.%, and is 0.1 wt.%, 0.15 wt.%, 0.2 wt.%, 0.3 wt.%, 0.32 wt.%, 0.35 wt.%, 0.37 wt.%, 0.39 wt.%, 0.4 wt.%, 0.42 wt.%, 0.45 wt.%, 0.47 wt.%, 0.49 wt.%, and 0.5 wt.%, based on 100 wt.% of the mass of the ceramic mould gypsum powder, but not limited to the recited values, and other non-recited values in the numerical value range are also applicable.
The proportion of the cement added is 0.1 to 1.5 wt.%, and may be, for example, 0.1 wt.%, 0.2 wt.%, 0.3 wt.%, 0.4 wt.%, 0.5 wt.%, 0.6 wt.%, 0.7 wt.%, 0.8 wt.%, 0.9 wt.%, 1.0 wt.%, 1.1 wt.%, 1.2 wt.%, 1.3 wt.%, 1.4 wt.%, 1.5 wt.%, but is not limited to the recited values, and other values not recited within the range of values are also applicable.
The organic admixture is added in a proportion of 0.3 to 0.5 wt.%, and may be, for example, 0.3 wt.%, 0.32 wt.%, 0.35 wt.%, 0.37 wt.%, 0.39 wt.%, 0.4 wt.%, 0.42 wt.%, 0.45 wt.%, 0.47 wt.%, 0.49 wt.%, 0.5 wt.%, but is not limited to the recited values, and other values not recited in the numerical ranges are also applicable.
The phosphate comprises one or a combination of at least two of trisodium phosphate, sodium tripolyphosphate or sodium hexametaphosphate, the cement comprises portland cement or aluminate cement, and further, the cement specifically comprises one or a combination of at least two of ordinary portland cement, portland slag cement, portland fly ash cement or portland sulphoaluminate cement. The organic admixture comprises one or a combination of at least two of carboxymethyl cellulose, polyvinyl alcohol or hydroxypropyl methyl cellulose ether.
The organic admixture has a polymerization degree of 500 to 2000, and may be, for example, 500, 600, 700, 800, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 2000, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.
The particle size of the organic admixture is 200 to 500. mu.m, and may be, for example, 200. mu.m, 220. mu.m, 240. mu.m, 260. mu.m, 280. mu.m, 300. mu.m, 350. mu.m, 370. mu.m, 390. mu.m, 400. mu.m, 420. mu.m, 440. mu.m, 460. mu.m, or 500. mu.m, but the organic admixture is not limited to the above-mentioned values, and other values not specifically mentioned within the above-mentioned range are also applicable.
The time for standing is 2 to 4min, for example, 2min, 2.2min, 2.4min, 2.6min, 2.8min, 3.0min, 3.2min, 3.4min, 3.6min, 3.8min, 4min, but is not limited to the values listed, and other values not listed in the range of the values are also applicable.
The stirring time is 3 to 5min, and may be, for example, 3min, 3.2min, 3.4min, 3.6min, 3.8min, 4min, 4.2min, 4.4min, 4.6min, 4.8min, or 5min, but is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned range are also applicable.
The stirring speed is 500 to 600r/min, for example, 500r/min, 510r/min, 520r/min, 530r/min, 540r/min, 550r/min, 560r/min, 570r/min, 580r/min, 590r/min, 600r/min, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.
Example 1
The embodiment provides a preparation method of a corrosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
weighing gypsum powder, adding 0.1 wt.% of trisodium phosphate, 0.1 wt.% of Portland cement and 0.3 wt.% of polyvinyl alcohol according to the mass ratio, and dry-mixing uniformly, wherein the mass of the gypsum powder is 100 wt.%. Adding a certain mass of water, stirring and standing to obtain the ceramic gypsum mould.
Example 2
The embodiment provides a preparation method of a corrosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
weighing gypsum powder, adding 0.3 wt.% of trisodium phosphate, 0.1 wt.% of Portland cement and 0.3 wt.% of polyvinyl alcohol according to the mass ratio, and dry-mixing uniformly, wherein the mass of the gypsum powder is 100 wt.%. Adding a certain mass of water, stirring and standing to obtain the ceramic gypsum mould.
Example 3
The embodiment provides a preparation method of a corrosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
weighing gypsum powder, adding 0.5 wt.% of trisodium phosphate, 0.1 wt.% of Portland cement and 0.3 wt.% of polyvinyl alcohol according to the mass ratio, and dry-mixing uniformly, wherein the mass of the gypsum powder is 100 wt.%. Adding a certain mass of water, stirring and standing to obtain the ceramic gypsum mould.
Example 4
The embodiment provides a preparation method of a corrosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
weighing gypsum powder, adding 0.3 wt.% of trisodium phosphate, 0.1 wt.% of Portland cement and 0.4 wt.% of polyvinyl alcohol according to the mass ratio, and dry-mixing uniformly, wherein the mass of the gypsum powder is 100 wt.%. Adding a certain mass of water, stirring and standing to obtain the ceramic gypsum mould.
Example 5
The embodiment provides a preparation method of a corrosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
weighing gypsum powder, adding 0.3 wt.% of trisodium phosphate, 1.0 wt.% of Portland cement and 0.4 wt.% of polyvinyl alcohol according to the mass ratio, and dry-mixing uniformly, wherein the mass of the gypsum powder is 100 wt.%. Adding a certain mass of water, stirring and standing to obtain the ceramic gypsum mould.
Example 6
The embodiment provides a preparation method of a corrosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
weighing gypsum powder, adding 0.3 wt.% of trisodium phosphate, 1.5 wt.% of Portland cement and 0.4 wt.% of polyvinyl alcohol according to the mass ratio, and dry-mixing uniformly, wherein the mass of the gypsum powder is 100 wt.%. Adding a certain mass of water, stirring and standing to obtain the ceramic gypsum mould.
Example 7
The embodiment provides a preparation method of a corrosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
weighing gypsum powder, adding 0.5 wt.% of trisodium phosphate, 1.5 wt.% of Portland cement and 0.3 wt.% of polyvinyl alcohol according to the mass ratio, and dry-mixing uniformly, wherein the mass of the gypsum powder is 100 wt.%. Adding a certain mass of water, stirring and standing to obtain the ceramic gypsum mould.
Example 8
The embodiment provides a preparation method of a corrosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
weighing gypsum powder, adding 0.5 wt.% of trisodium phosphate, 1.5 wt.% of Portland cement and 0.4 wt.% of polyvinyl alcohol according to the mass ratio, and dry-mixing uniformly, wherein the mass of the gypsum powder is 100 wt.%. Adding a certain mass of water, stirring and standing to obtain the ceramic gypsum mould.
Example 9
The embodiment provides a preparation method of a corrosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
weighing gypsum powder, adding 0.5 wt.% of trisodium phosphate, 1.5 wt.% of Portland cement and 0.5 wt.% of polyvinyl alcohol according to the mass ratio, and dry-mixing uniformly, wherein the mass of the gypsum powder is 100 wt.%. Adding a certain mass of water, stirring and standing to obtain the ceramic gypsum mould.
Comparative example 1
The comparative example provides a preparation method of an erosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
compared to example 1, except that 0.1 wt.% trisodium phosphate and 0.5 wt.% portland cement were added, the other conditions and parameters were the same as in example 1.
Comparative example 2
The comparative example provides a preparation method of an erosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
compared to example 1, 0.1 wt.% trisodium phosphate, 0.5 wt.% portland cement and 0.2 wt.% polyvinyl alcohol were added, with the other conditions and parameters being the same as in example 1.
Comparative example 3
The comparative example provides a preparation method of an erosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
compared to example 1, 0.1 wt.% trisodium phosphate, 0.5 wt.% portland cement and 0.6 wt.% polyvinyl alcohol were added, with the other conditions and parameters being the same as in example 1.
Comparative example 4
The comparative example provides a preparation method of an erosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
in comparison with example 1, except that 0.6 wt.% sodium tripolyphosphate was added, the other conditions and parameters were the same as in example 1.
Comparative example 5
The comparative example provides a preparation method of an erosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
compared to example 1, except that 1.6 wt.% of portland cement was added, the other conditions and parameters were the same as in example 1.
Comparative example 6
The comparative example provides a preparation method of an erosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
compared to example 1, except that 0.2 wt.% of polyvinyl alcohol was added, the other conditions and parameters were the same as in example 1.
Comparative example 7
The comparative example provides a preparation method of an erosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
compared to example 1, 0.6 wt.% sodium tripolyphosphate, 1.6 wt.% sulphoaluminate cement and 0.6 wt.% polyvinyl alcohol are added, with the other conditions and parameters being the same as in example 1.
Comparative example 8
The comparative example provides a preparation method of an erosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
compared to example 1, 0.6 wt.% sodium tripolyphosphate, 1.7 wt.% portland cement, and 0.2 wt.% polyvinyl alcohol were added, with the other conditions and parameters being the same as in example 1.
Comparative example 9
The comparative example provides a preparation method of an erosion-resistant ceramic gypsum mold, which specifically comprises the following steps:
compared with the example 1, a certain mass of water is added, no additive is added, the stirring is uniform, and other conditions and parameters are the same as those of the example 1.
The ceramic plaster molds of the above examples and comparative examples were subjected to flexural strength, water absorption rate, and corrosion rate tests, and the test structures are shown in table 1 below:
TABLE 1 ceramic Gypsum die test data
Weighing gypsum powder, wherein the adding proportion of phosphate, cement and an organic additive is respectively 0.1-0.5 wt.%, 0.1-1.5 wt.% and 0.3-0.5 wt.% based on 100 wt.% of the ceramic mold gypsum powder, the gypsum powder is uniformly dry-mixed with the gypsum powder, the stirring time is 3-5 min, the stirring rotating speed is 500-600 r/min, the particle size of the organic additive is 200-500 mu m, and the standing time is 2-4 min, so that the ceramic gypsum mold is obtained.
In the present invention, the erosion resistance of the ceramic plaster mold is mainly related to the erosion rate, and the lower the erosion rate, the stronger the erosion resistance of the ceramic plaster mold. According to the embodiments and the comparative example, the corrosion rate of the ceramic gypsum mold can be greatly reduced, the breaking strength, the water absorption rate and the water absorption rate of the gypsum are not obviously adversely affected, and when the addition ratio of the phosphate, the cement and the organic additive is respectively 0.1-0.5 wt.%, 0.1-1.5 wt.% and 0.3-0.5 wt.% based on 100 wt.% of the mass of the ceramic mold gypsum powder, the prepared ceramic gypsum mold has better corrosion resistance.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The preparation method of the corrosion-resistant ceramic gypsum mold is characterized by comprising the following steps of: the method comprises the steps of dry mixing phosphate, cement, an organic additive and the ceramic mould gypsum powder uniformly, adding water, stirring, and standing to obtain the ceramic gypsum mould, wherein the adding proportions of the phosphate, the cement and the organic additive are respectively 0.1-0.5 wt.%, 0.1-1.5 wt.% and 0.3-0.5 wt.% based on 100 wt.% of the ceramic mould gypsum powder.
2. The method of claim 1, wherein the phosphate comprises one or a combination of at least two of trisodium phosphate, sodium tripolyphosphate, and sodium hexametaphosphate.
3. A method according to claim 1 or 2, wherein said cement comprises portland cement or aluminate cement.
4. The method according to any one of claims 1 to 3, wherein the cement specifically comprises one or a combination of at least two of ordinary portland cement, portland slag cement, portland fly ash cement, or portland sulphoaluminate cement.
5. The method of any one of claims 1 to 4, wherein the organic admixture comprises one or a combination of at least two of carboxymethyl cellulose, polyvinyl alcohol or hydroxypropyl methyl cellulose ether.
6. The method according to any one of claims 1 to 5, wherein the organic admixture has a degree of polymerization of 500 to 2000.
7. The method according to any one of claims 1 to 6, wherein the particle size of the organic admixture is 200 to 500 μm.
8. The method according to any one of claims 1 to 7, wherein the standing time is 2 to 4 min.
9. The method according to any one of claims 1 to 8, wherein the stirring time is 3 to 5 min.
10. The method according to any one of claims 1 to 9, wherein the stirring is performed at a rotation speed of 500 to 600 r/min.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201514124A (en) * | 2013-10-08 | 2015-04-16 | Chc Resources Corp | Bonding material containing gypsum |
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2021
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| TW201514124A (en) * | 2013-10-08 | 2015-04-16 | Chc Resources Corp | Bonding material containing gypsum |
| CN105347768A (en) * | 2015-11-03 | 2016-02-24 | 北京建筑材料科学研究总院有限公司 | Gypsum powder for pressure slip-casting mold |
| CN106082746A (en) * | 2016-06-08 | 2016-11-09 | 泰安市跨海贸易有限公司 | A kind of additive improving gypsum crystal anti-corrosion performance |
| CN108911664A (en) * | 2018-07-11 | 2018-11-30 | 中国船舶重工集团公司第七二五研究所 | The preparation method of nanometer scale ceramics powder pressure injection forming high strength gypsum mould |
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