CN112159206B - Ceramic hand mould for producing nitrile rubber glove and PVC glove and preparation method thereof - Google Patents

Ceramic hand mould for producing nitrile rubber glove and PVC glove and preparation method thereof Download PDF

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CN112159206B
CN112159206B CN202011054324.5A CN202011054324A CN112159206B CN 112159206 B CN112159206 B CN 112159206B CN 202011054324 A CN202011054324 A CN 202011054324A CN 112159206 B CN112159206 B CN 112159206B
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ceramic
nitrile rubber
glove
soil
ceramic hand
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CN112159206A (en
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姜霁洋
姜宝
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    • C04B33/16—Lean materials, e.g. grog, quartz
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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Abstract

The invention relates to the technical field of ceramic hand molds, in particular to a ceramic hand mold for producing nitrile rubber gloves and PVC gloves and a preparation method thereof. The ceramic hand die for producing the nitrile rubber glove and the PVC glove consists of a ceramic blank body and a surface glaze layer, wherein the ceramic blank body is as follows: 20-22% of feldspar, 15-20% of mill soil, 3-5% of Suzhou soil, 5-10% of cooked talcum and alpha-Al 2 O 3 20-35%, 10-14% of cooked large common soil, 6-10% of raw large common soil, 5-8% of quartz and 1-5% of zirconia; the surface glaze layer is as follows: alpha-Al 2 O 3 20-30%, 2-5% of zirconia, 20-30% of feldspar, 5-12% of quartz, 2-5% of Suzhou soil, 5-10% of cooked talcum and 20-30% of clay. The ceramic hand die has the advantages of long service life, strong acid and alkali corrosion resistance, good thermal shock resistance and the like; the invention also provides a preparation method of the composite.

Description

Ceramic hand mould for producing nitrile rubber glove and PVC glove and preparation method thereof
Technical Field
The invention relates to the technical field of ceramic hand molds, in particular to a ceramic hand mold for producing nitrile rubber gloves and PVC gloves and a preparation method thereof.
Background
The glove mould is a special mould for glove dipping forming in rubber, latex and PVC glove industry production. Before use, the glove model is cleaned by acid liquor, immersed in hot water for heating, immersed in coagulant for drying, then immersed in melted rubber or latex, dried by a drying oven after immersed in the rubber, added with a fiber inner sleeve, washed with hot water, sent to the drying oven for vulcanization, and dried for forming. The glove mould is subjected to repeated rapid cooling, rapid heating and chemical corrosion in the whole process, and the glove mould is required to have good corrosion resistance and thermal stability, so that the ceramic hand mould is used in the glove industry, has good heat resistance, acid resistance, alkali resistance and corrosion resistance, has the characteristics of good stripping property, good forming property, high hardness, difficult scratch and the like, and has the service life which is several times that of the metal hand mould.
Although the ceramic hand mould is an industrial ceramic, the raw materials used are the same as those of the traditional daily ceramic, including clay, quartz, feldspar and the like, so that the thermal expansion coefficient of the product is still larger, and along with the improvement of glove production technology and the acceleration of production efficiency, the requirement on the thermal stability of the ceramic hand mould is also higher and higher, so that the adjustment of the raw material formula of the traditional ceramic hand mould to improve the thermal stability of the traditional ceramic hand mould is extremely important.
Moreover, the requirements of various liquids on the erosion resistance of ceramic hand molds are different, wherein the requirements of ceramic hand molds of nitrile rubber gloves are the most demanding: after each hand mould use, the hand mould is sprayed and cleaned by acidic washing liquid with the pH value of 3, and then is sprayed and cleaned by alkaline washing liquid with the pH value of 10.5, wherein the cleaning temperature is 50-60 ℃. The hand mould for producing the nitrile rubber glove should have good acid and alkali corrosion resistance and good thermal shock resistance.
The patent CN201410420911.X discloses a ceramic hand mould for producing nitrile rubber and PVC gloves and a preparation method thereof, wherein the ceramic hand mould comprises the following raw materials in percentage by weight: 6-8% of quartz, 12-22% of feldspar, 32-45% of cooked Datong soil, 4-16% of mill soil, 2-3% of Suzhou soil, 10-30% of cooked bauxite, 2-8% of cooked talcum and alpha-Al 2 O 3 10-30%. The ceramic hand mould for producing the nitrile rubber and PVC gloves has the advantages of long service life, strong acid and alkali corrosion resistance, good thermal shock resistance and the like; the invention adopts the reducing flame sintering method to sinter the green body, and the method is simple and easy to implement and is beneficial to realizing industrialization.
Patent CN201711245612.7 discloses a mullite ceramic hand mold used for nitrile rubber gloves and a production method thereof, wherein the mullite ceramic hand mold comprises the following raw materials in parts by weight: 16-25% of feldspar, 30-45% of Datong soil, 10-18% of purple wood knots, 6-15% of alumina, 2-6% of Suzhou soil, 2-6% of cooked talcum and 0.30-0.50% of electrolyte; firstly, ball milling the raw materials into slurry, filtering by a vibrating screen, and removing iron; mixing the slurry with specific gravity of 1.67-1.71g/cm 3 Sending the semi-finished product into a workshop, vacuumizing for 2-3 hours, preparing a semi-finished product of the hand mold, and then drying, trimming and sintering the semi-finished product. The hand mould prepared by the method has long online service life, the online time is 10-15 months, the acid and alkali resistance is good, the thermal shock resistance is good, and the product percent of pass is improved to 95% from the original 87%.
Patent CN201110118898.9 discloses a far infrared ceramic hand mould and a preparation method thereof, and a far infrared ceramic coating is prepared from the following raw materials in percentage by weight: 40-60% of zircon sand, 10-20% of purple wood festival soil, 8-15% of coal gangue, 15-8% of manganese oxide, 10-20% of ferric oxide, 0.3-1% of cobalt oxide, 0.5-1.5% of chromium oxide and 2-3% of titanium oxide. When the far infrared ceramic hand die is used, the surface temperature of the far infrared ceramic hand die is 5-10 ℃ higher than that of a common ceramic hand die when plastic glue liquid is dipped, so that energy consumption is saved, and the ceramic hand die body can adopt inferior gangue, inferior clay or slag and the like as main raw materials, so that the cost is reduced by about 50% compared with the prior art.
The ceramic hand mould produced by the existing raw material formula is improved aiming at part of performances of the hand mould, the crystal phase types of the ceramic are few, and the ceramic hand mould cannot achieve excellent thermal shock stability, acid resistance, alkali resistance and the like.
Disclosure of Invention
The invention aims to provide a ceramic hand mould for producing nitrile rubber gloves and PVC gloves, which has the advantages of long online service life, strong acid and alkali erosion resistance, good thermal shock resistance and the like; the invention also provides a preparation method which is simple and easy to implement and is beneficial to realizing industrialization.
The invention relates to a ceramic hand mould for producing nitrile rubber gloves and PVC gloves, which consists of a ceramic blank body and a surface glaze layer,
wherein the ceramic body consists of the following raw materials in percentage by mass: 20-22% of feldspar, 15-20% of mill soil, 3-5% of Suzhou soil, 5-10% of cooked talcum and alpha-Al 2 O 3 20-35%, 10-14% of cooked large common soil, 6-10% of raw large common soil, 5-8% of quartz and 1-5% of zirconia;
the overglaze layer is composed of the following raw materials in percentage by mass: alpha-Al 2 O 3 20-30%, 2-5% of zirconia, 20-30% of feldspar, 5-12% of quartz, 2-5% of Suzhou soil, 5-10% of cooked talcum and 20-30% of clay.
α-Al 2 O 3 The purity is 98-99%.
The invention relates to a preparation method of a ceramic hand mould for producing nitrile rubber gloves and PVC gloves, which comprises the following steps:
(1) Raw materials of the ceramic green body are mixed according to a formula, and wet ball milling is carried out to prepare raw material slurry;
(2) Sieving the raw material slurry by a vibrating screen, putting the raw material slurry into a mud filter, and separating mud cakes;
(3) Adding water, sodium carbonate and water glass into the mud cake, beating into mud, performing secondary iron removal treatment, performing secondary screening, aging, and pumping into a high-level storage tank;
(4) Performing pressure grouting molding, drying at room temperature, and then repairing a blank to prepare a ceramic blank;
(5) Proportioning raw materials of the overglaze layer according to a formula, performing wet ball milling, filtering, and diluting with water to prepare overglaze dispersion;
(6) Immersing the ceramic blank body into the overglaze dispersion liquid for 10-20s, and then taking out for post-treatment;
(7) Sintering the post-treated ceramic blank by adopting a weak reducing flame sintering method or an oxidizing flame sintering method, and checking to obtain a finished product.
The ball milling time in the step (1) is 42-48h.
The screening in the step (2) and the step (3) adopts a 325-mesh screen, and the screen allowance is 0.01-0.03%.
The dosage of sodium carbonate and water glass in the step (3) is 0.3-0.5% of the total mass of the ceramic body raw materials, and the specific gravity of slurry is 1.7-1.8g/cm 3 。
In the step (4), the blank repairing means that the pattern and the residual mud are removed by dipping the sponge into water manually, and the bubbles and the residual pits on the surface are repaired by using a tool.
In the step (5), the ball milling time is 15-20h, and the sieve residue is less than 0.1% after filtering by a 325 mesh sieve. The concentration of the overglaze dispersion is 0.5-2%.
The post-treatment in the step (6) comprises a scutching or guniting process, wherein the scutching process comprises the following steps: after the ceramic blank is immersed in the overglaze dispersion liquid, the ceramic microspheres are uniformly sprayed on the position needing to be twined by a sand blasting gun, the pressure of compressed air is 0.1-0.3MPa during twining, and the diameter of the ceramic microspheres is 0.1-0.15mm. The hemp beating or guniting part can be the finger part, palm part, finger part and palm part or all of the hand mould. The hand mould supports the production of the butyronitrile glove with a smooth surface, namely the glove without pocks, and also supports the production of the glove with pocks.
The sintering temperature in the step (7) is 1330-1400 ℃.
Specifically, the preparation method of the ceramic hand mold for producing the nitrile rubber glove and the PVC glove comprises the following steps:
(1) The raw materials of the ceramic body are proportioned according to the formula, and then water is added for ball milling for 42-48 hours to prepare slurry;
(2) Sieving the slurry obtained in the step (1) through a 325-mesh vibrating screen to ensure that the fineness of the slurry is 325 meshes and the screen allowance is 0.01-0.03%, then putting the slurry into a mud filter through a permanent magnet iron remover, and separating mud cakes in the mud filter through industrial filter cloth;
(3) Adding water into the mud cake obtained in the step (2), stirring, adding sodium carbonate and water glass accounting for 0.3-0.5% of the total mass of the ceramic body raw materials, and beating into mud, wherein the specific gravity of the mud is 1.7g/cm 3 -1.8g/cm 3 Secondly, carrying out secondary iron removal treatment, carrying out secondary screening on the slurry by using a 325-mesh vibrating screen, ageing for 24 hours, and pumping the slurry into a high-level storage tank;
(4) Performing pressure grouting molding, drying at room temperature, and then repairing a blank to prepare a ceramic blank;
(5) Proportioning raw materials of the overglaze layer according to a formula, performing wet ball milling for 15-20h, filtering by using a 325-mesh sieve, diluting with water to prepare overglaze dispersion liquid with the concentration of 0.5-2%, wherein the screen residue is less than 0.1%;
(6) Immersing the ceramic blank body into the overglaze dispersion liquid for 10-20s, and then taking out for post-treatment;
(7) Sintering the post-treated ceramic blank by adopting a weak reducing flame sintering method or an oxidizing flame sintering method, wherein the sintering temperature is 1330-1400 ℃, and checking to obtain a finished product.
Quartz is a barren component and plays a role of a framework; feldspar is a solvent component and plays a role in fusion; the Suzhou soil is a plastic component and plays a role in suspending slurry materials; alpha-Al 2 O 3 The introduction can enhance the alkali corrosion resistance of the product, improve the mechanical strength of the product, and the alpha-Al 2 O 3 The mullite-corundum crystal phase is generated at high temperature, so that the Mohs hardness of the ceramic hand die can be improved; the mill soil enhances the fluidity of the slurry; cooked talc may enhance the thermal stability of the product.
α-Al 2 O 3 Not only can be used as a brightening agentAnd under the atmosphere of reducing flame firing, alpha-Al 2 O 3 Can fully react with cooked talcum to generate cordierite and generate a Molaite crystal phase structure, so that the microstructure of the ceramic hand mould is obviously improved, and the specific gravity of the ceramic hand mould is increased, and the compactness, the thermal stability and the mechanical strength are obviously improved.
The invention introduces higher content of Al 2 O 3 Zirconium oxide is introduced, and under the high-temperature sintering condition, high-alumina microparticles and zirconium microparticles are enriched on the surface of a product in the forming process to form Morley phase and cordierite phase structures, so that the microstructure of the product is improved, and the acid and alkali resistance of the ceramic hand mold is improved.
In addition, the ceramic green body is immersed in the overglaze dispersion liquid before the hemp is beaten or the slurry is sprayed, so that the defect formed on the surface of the ceramic hand die can be avoided, the qualification rate of the ceramic hand die is improved, and the acid-base resistance and the thermal stability of the ceramic hand die can be further enhanced.
The quartz used in the invention is provided by Shandong Pingyi mineral Co., ltd; the technical indexes are as follows: the weight content of each component is as follows: siO (SiO) 2 97％-99％，Al 2 O 3 +Fe 2 O 3 +CaO+MgO 1％-3％。
The feldspar adopted by the invention is provided by a supplier of Xinrui long stone ore in Shandong Laizhou; the technical indexes are as follows: the weight content of each component is as follows: siO (SiO) 2 62％-68％，Al 2 O 3 17％-21％，K 2 O6％-10％，Na 2 O4％-7％，Fe 2 O 3 +CaO0.5% -0.7%, and the rest is the ignition loss.
The Suzhou soil supplier adopted by the invention is Jiangsu Suzhou hardware mineral trade company; the weight content of each component is as follows: siO (SiO) 2 44％-48％，Al 2 O 3 36％-40％，Fe 2 O 3 +CaO0.3% -0.5%, trace amount of MgO, K 2 Trace of O, na 2 Trace O and 12-14% burning loss.
The supplier of the Fangzi soil adopted by the invention is a Weifang refractory raw material limited company; the weight content of each component is as follows: siO (SiO) 2 54％-58％，Al 2 O 3 28-32％％，K 2 O+Fe 2 O 3 1.5％-3.5％，CaO+MgO+Na 2 0.3 to 0.6 percent of O and 8 to 12 percent of burning loss.
The supplier of cooked talc used in the present invention is Bo Yuan Talcum powder factory in Shandong Kaxia county; the weight content of each component is as follows: siO (SiO) 2 62％-67％，CaO1％-5％，MgO28％-32％，Al 2 O 3 +Fe 2 O 3 1％-1.5％。
The supplier of the mature Datong soil adopted by the invention is Shandong Datong mining resource limited company; the weight content of each component is as follows: siO (SiO) 2 42％-46％，Al 2 O 3 37％-41％，Fe 2 O 3 +CaO+MgO+K 2 O+Na 2 1 to 1.5 percent of O and 14 to 18 percent of burning loss.
alpha-Al used in the invention 2 O 3 Is a supplier of Shandong aluminum, and has a purity of 98-99%.
SiO in the chemical components of the ceramic hand mould prepared by the invention 2 Less than 50% of Al 2 O 3 The content of (2) is 30% -58%.
The ceramic hand mould prepared by the invention can be applied to the production of nitrile rubber gloves, and can also be used for the production of common latex gloves and PVC gloves.
When the nitrile rubber ceramic hand mold is prepared by the invention, a scutching process or a guniting process can be adopted, and concave points or convex points are uniformly distributed on the finger part and/or the palm part of the prepared ceramic hand mold; when the ceramic hand mould is prepared, a scutching process or a guniting process is not adopted, and the surface of the prepared ceramic hand mould is smooth and bright.
Compared with the prior art, the invention has the following beneficial effects:
(1) The ceramic hand mould of the invention introduces alpha-Al by improving the product formula 2 O 3 And a small amount of zirconia, and increasing sintering temperature, and under the action of high temperature, the raw material components are interacted to obtain mullite crystal phase, cordierite crystal phase, corundum crystal phase and quartz crystal phase, wherein the mullite crystal phase is 20-44%, the corundum crystal phase is 10-35%, the cordierite crystal phase is 0.5-5%, the quartz crystal phase is 0.5-4%, and multiple crystal phases coexistThe Mohs hardness, acid and alkali resistance and thermal shock resistance of the ceramic hand die can be obviously improved;
(2) According to the invention, a very thin surface glaze layer is immersed on the surface of the ceramic hand mold, so that product defects caused by a hemp beating or slurry spraying process are avoided, the qualification rate of the product is greatly improved, the qualification rate of the ceramic hand mold is improved to be more than 99% from 90-97% in the prior art, the total shrinkage rate of the product is reduced to be 12-15% from 13-18%, black spots, convex-concave melting spots, deformation and the like in the hand mold disappear, and the Mohs hardness, acid and alkali resistance and thermal shock resistance of the ceramic hand mold are further improved due to the addition of the surface glaze layer;
(3) The Mohs hardness of the ceramic hand mould reaches 7-9 levels, the acid resistance is 99.5-99.98%, the alkali resistance is 99.2-99.5%, the thermal shock stability reaches more than 250 ℃, the service life of the ceramic hand mould is long, the ceramic hand mould can be used for more than 24 months on line in the production of nitrile rubber gloves, and each performance is far better than that of the existing products.
Drawings
FIG. 1 is an X-ray diffraction pattern of a ceramic hand mold prepared in example 1 of the present invention.
Detailed Description
Example 1
(1) The formula of the ceramic body is as follows (mass percent): 22% of feldspar, 15% of mill soil, 3% of Suzhou soil, 6% of cooked talcum and alpha-Al 2 O 3 30%, 10% of cooked soil, 6% of raw soil, 5% of quartz and 3% of zirconia; preparing raw materials of the ceramic green body according to a formula, adding water, ball-milling for 48 hours, and preparing slurry;
(2) Sieving the slurry obtained in the step (1) through a 325-mesh vibrating screen to ensure that the fineness of the slurry is 325 meshes and the screen allowance is 0.01%, then putting the slurry into a mud filter through a permanent magnet iron remover, and separating mud cakes in the mud filter through industrial filter cloth;
(3) Adding water accounting for 40 percent of the total weight of the ceramic body raw materials into the mud cake obtained in the step (2), stirring, adding sodium carbonate accounting for 0.5 percent of the total weight of the ceramic body raw materials and water glass, beating into mud, wherein the specific gravity of the mud is 1.8g/cm 3 Secondly, carrying out secondary iron removal treatment, carrying out secondary screening on the slurry by using a 325-mesh vibrating screen, ageing for 24 hours, and pumping the slurry into a high-level storage tank;
(4) Performing pressure grouting molding, drying at room temperature, and then repairing a blank to prepare a ceramic blank;
(5) The formula of the glaze layer is as follows (mass percent): alpha-Al 2 O 3 30% of zirconia, 28% of feldspar, 10% of quartz, 3% of Suzhou soil, 6% of cooked talcum and 21% of clay; proportioning raw materials of the overglaze layer according to a formula, performing wet ball milling for 20 hours, filtering by using a 325-mesh sieve, diluting with water to prepare overglaze dispersion with the concentration of 1%, wherein the screen residue is less than 0.1%;
(6) Immersing the ceramic blank body into the overglaze dispersion liquid for 10s, taking out, beating the hemp, uniformly spraying ceramic microspheres on the position needing beating the hemp points by using a sand blasting gun onto a hand die, wherein the pressure of compressed air is 0.2MPa during beating the hemp, and the diameter of the ceramic microspheres is 0.1mm;
(7) And (3) feeding the ceramic blank after the hemp is made into a kiln, sintering by adopting a weak reducing flame sintering method, wherein the sintering temperature is 1380 ℃, and checking to obtain a finished product.
The ceramic hand mold prepared in example 1 was examined by X-ray diffractometer (model: D/max-IIIB) with the detection standard JY/T009-1996, test voltage 40kV, test current 30mA, scan speed 4℃/min, temperature 25 ℃. The results of the detection are shown in FIG. 1, and the ceramic hand-mold crystal phase is mullite phase (42 wt%), corundum phase (32 wt%), quartz phase (4 wt%), and cordierite phase (5 wt%).
Example 2
The preparation method is the same as in example 1, except that the raw material formulation is:
the formula of the ceramic body is as follows (mass percent): 20% of feldspar, 18% of mill soil, 5% of Suzhou soil, 5% of cooked talcum and alpha-Al 2 O 3 20%, 12% of mature soil, 8% of raw soil, 8% of quartz and 4% of zirconia.
The formula of the glaze layer is as follows (mass percent): alpha-Al 2 O 3 25% of zirconia, 3% of feldspar, 20% of quartz, 12% of Suzhou soil, 2% of cooked talcum and 30% of clay.
Example 3
The preparation method is the same as in example 1, except that the raw material formulation is:
ceramic bodyThe formula comprises the following components in percentage by mass: 20% of feldspar, 15% of mill soil, 3% of Suzhou soil, 5% of cooked talcum and alpha-Al 2 O 3 31%, 10% of cooked soil, 6% of raw soil, 5% of quartz and 5% of zirconia.
The formula of the glaze layer is as follows (mass percent): alpha-Al 2 O 3 25% of zirconia, 5% of feldspar, 30% of quartz, 5% of Suzhou soil, 10% of cooked talcum and 20% of clay.
Example 4
The raw material formulation was the same as in example 1, except that the preparation method was: adding water accounting for 40 percent of the total weight of the ceramic body raw materials into the mud cake in the step (3), stirring, adding sodium carbonate accounting for 0.5 percent of the total weight of the ceramic body raw materials and water glass, beating into mud, wherein the specific gravity of the mud is 1.7g/cm 3 Secondly, carrying out secondary iron removal treatment, carrying out secondary screening on the slurry by using a 325-mesh vibrating screen, ageing for 24 hours, and pumping the slurry into a high-level storage tank; the concentration of the surface glaze dispersion liquid in the step (5) is 0.5 percent; the sintering temperature in step (7) was 1330 ℃.
Example 5
The raw material formulation was the same as in example 2, except that the preparation method was: in the step (3), water accounting for 45 percent of the total weight of the ceramic body raw material is added into the mud cake for stirring, sodium carbonate accounting for 0.3 percent of the total weight of the ceramic body raw material and water glass are added into the mud cake for beating into mud, and the specific gravity of the mud is 1.75g/cm 3 Secondly, carrying out secondary iron removal treatment, carrying out secondary screening on the slurry by using a 325-mesh vibrating screen, ageing for 24 hours, and pumping the slurry into a high-level storage tank; the concentration of the surface glaze dispersion liquid in the step (5) is 2 percent; the sintering temperature in the step (7) is 1400 ℃.
Comparative example 1
This comparative example uses the preparation method of example 1 in patent cn201410420911.X to prepare a ceramic hand mold.
Comparative example 2
This comparative example differs from example 1 only in that the glaze layer is not included and the ceramic body is soaked with clear water for 10s before scutching.
The ceramic hand molds prepared in examples 1-5 and comparative examples 1-2 were subjected to a crystal phase test and a performance test, wherein the crystal phase test standard was JY/T009-1996, the Mohs hardness test standard was BS EN 15771:2010, the acid and alkali resistance test standard was HG/T3210-2002, and the thermal stability test standard was GB/T3298-1991. The test results are shown in Table 1.
TABLE 1 results of Performance measurements of ceramic hand molds prepared in examples 1-5 and comparative examples 1-2
Figure BDA0002710484440000071

Claims (6)

1. A ceramic hand mould for production of nitrile rubber gloves and PVC gloves, its characterized in that: consists of a ceramic body and a surface glaze layer,
wherein the ceramic body consists of the following raw materials in percentage by mass: 20-22% of feldspar, 15-20% of mill soil, 3-5% of Suzhou soil, 5-10% of cooked talcum and alpha-Al 2 O 3 20-35%, 10-14% of cooked large common soil, 6-10% of raw large common soil, 5-8% of quartz and 1-5% of zirconia;
the overglaze layer is composed of the following raw materials in percentage by mass: alpha-Al 2 O 3 20-30%, 2-5% of zirconia, 20-30% of feldspar, 5-12% of quartz, 2-5% of Suzhou soil, 5-10% of cooked talcum and 20-30% of clay;
the preparation method of the ceramic hand mold for producing the nitrile rubber glove and the PVC glove comprises the following steps:
(1) Raw materials of the ceramic green body are mixed according to a formula, and wet ball milling is carried out to prepare raw material slurry;
(2) Sieving the raw material slurry by a vibrating screen, putting the raw material slurry into a mud filter, and separating mud cakes;
(3) Adding water, sodium carbonate and water glass into the mud cake, beating into mud, performing secondary iron removal treatment, performing secondary screening, aging, and pumping into a high-level storage tank;
(4) Performing pressure grouting molding, drying at room temperature, and then repairing a blank to prepare a ceramic blank;
(5) Proportioning raw materials of the overglaze layer according to a formula, performing wet ball milling, filtering, adding water for dilution, and preparing overglaze dispersion liquid with the concentration of 0.5-2%;
(6) Immersing the ceramic blank body into the overglaze dispersion liquid for 10-20s, and then taking out for post-treatment;
(7) Sintering the post-treated ceramic blank by adopting a weak reducing flame sintering method or an oxidizing flame sintering method, wherein the sintering temperature is 1330-1400 ℃, and checking to obtain a finished product;
the post-treatment in the step (6) comprises a scutching or guniting process, wherein the scutching process comprises the following steps: after the ceramic blank is immersed in the overglaze dispersion liquid, the ceramic microspheres are uniformly sprayed on the position needing to be twined by a sand blasting gun, the pressure of compressed air is 0.1-0.3MPa during twining, and the diameter of the ceramic microspheres is 0.1-0.15mm.
2. Ceramic hand former for nitrile rubber glove and PVC glove production according to claim 1, characterized in that: alpha-Al 2 O 3 The purity is 98-99%.
3. Ceramic hand former for nitrile rubber glove and PVC glove production according to claim 1, characterized in that: the ball milling time in the step (1) is 42-48h.
4. Ceramic hand former for nitrile rubber glove and PVC glove production according to claim 1, characterized in that: the screening in the step (2) and the step (3) adopts a 325-mesh screen, and the screen allowance is 0.01-0.03%.
5. Ceramic hand former for nitrile rubber glove and PVC glove production according to claim 1, characterized in that: the dosage of sodium carbonate and water glass in the step (3) is 0.3-0.5% of the total mass of the ceramic body raw materials, and the specific gravity of slurry is 1.7-1.8g/cm 3 。
6. Ceramic hand former for nitrile rubber glove and PVC glove production according to claim 1, characterized in that: in the step (5), the ball milling time is 15-20h, and the sieve residue is less than 0.1% after filtering by a 325 mesh sieve.
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CN100569696C (en) * 2007-09-28 2009-12-16 淄博隆嘉工贸有限公司 A kind of method for making of ceramic hand-mold
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