CN108912752A - A kind of diatom ooze coating and preparation method thereof that formaldehyde is catalytically decomposed - Google Patents
A kind of diatom ooze coating and preparation method thereof that formaldehyde is catalytically decomposed Download PDFInfo
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- CN108912752A CN108912752A CN201810675858.6A CN201810675858A CN108912752A CN 108912752 A CN108912752 A CN 108912752A CN 201810675858 A CN201810675858 A CN 201810675858A CN 108912752 A CN108912752 A CN 108912752A
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
Abstract
The present invention relates to a kind of diatom ooze coatings and preparation method thereof that formaldehyde is catalytically decomposed, the coating includes catalytic decomposition formaldehyde activity material, diatomite, binder, deionized water, filler and dispersing agent, the preparation method of the coating is that diatomite in powder is mixed into deionized water to form suspension, then potassium permanganate is added to stir evenly, apply ultrasonic wave again, manganese sulfate and potassium hydroxide are added simultaneously, it is aged after fully reacting, it is separated by solid-liquid separation, the nano-material modified diatomite of manganese dioxide catalytic decomposition formaldehyde is made, again by modification infusorial earth and binder, deionized water, filler and dispersant are at body of paste up to the diatom ooze coating of constant temperature catalyzing decomposing formaldehyde of the present invention.Diatom ooze coating of the invention has the function of the advantages of constant temperature catalyzing decomposing formaldehyde, hardness is high, anti-scouring, simple process.
Description
Technical field
The present invention relates to a kind of environmental protection coating material and preparation method thereof, the diatom ooze coating of specifically a kind of catalytic decomposition formaldehyde
And preparation method thereof.
Background technique
With the raising of people's daily life and the raising of the level of consumption, people have increasingly the home environment of oneself
High requirement a, wherein broad aspect is design and finishing aspect indoors.And during interior decoration, it usually needs use
A large amount of timber, paint, glue and coating, due to containing a large amount of pollutant in timber, glue, paint and coating：Formaldehyde, benzene
With TVOC (total volatile organic compounds), these pollutants are sealed in the folder and glue of timber, and the short time is difficult to be evaporated completely
Entirely, the volatilization of especially formaldehyde is slower, can be with up to 3 years.People lives in such a case for a long time, meeting harmful to human
Health even results in serious disease and generates.
In recent years, the pollution problem of the volatile harmfuls pollutants such as formaldehyde, the benzene generated for interior decoration, major producer
It is proposed environmental protection coating material, is largely to be added to diatomite, active carbon or other adsorptivities with adsorptivity in coating
Substance carries out Adsorption to indoor pollutant by way of absorption.
Diatomite is used in most environmental protection coating material, is the physico-chemical property due to diatomite itself with inborn excellent
Gesture, the main component of diatomite are opal, are rich in multiple beneficial minerals, and quality is light and soft, and electron microscope shows diatomite
Particle surface has countless small holes, and for porosity up to 90% or more, specific surface area is up to 65m2/ g has stronger physics
Absorption property and ion-exchange performance, meanwhile, diatomite also has preferable soundproof effect, and therefore, diatomite is typically used as ring
The coating of guarantor.
But pollutant can only be adsorbed in hole by diatomite itself, when external environment changes, such as temperature liter
Height, air pressure change etc., pollutant can be detrimental to health from escaping and being diffused into air in hole.
In addition, also having part aiming at the problem that suction type can not thoroughly eliminate the volatile organic contaminants such as formaldehyde
Nano Titanium Oxide as Photocatalyst is adulterated in coating, is thoroughly decomposed the organic pollutants such as formaldehyde using photocatalyst, but photocatalyst one
As require mating ultraviolet radiator and can just work, and ultraviolet radiator be to human body it is harmful, people indoors when cannot open purple
Outside line lamp, program is cumbersome when concrete operations, inconvenient to use, nor what owner can operate.
The lasts that the present invention is directed to current environmental protection coating material are poor, are easy to produce secondary pollution, inconvenient to use etc. to ask
Topic, have devised it is a kind of under room temperature environment can the pollutants such as PARA FORMALDEHYDE PRILLS(91,95) thoroughly decompose the diatom ooze class coating eliminated and
Preparation method.
Summary of the invention
The invention discloses a kind of diatom ooze coatings and preparation method thereof that formaldehyde is catalytically decomposed, according to prepared by the present invention
Diatom ooze coating has the function of the advantages of constant temperature catalyzing decomposing formaldehyde, hardness is high, anti-scouring, simple process.
A kind of diatom ooze coating that formaldehyde is catalytically decomposed of the present invention, the coating by weight, including are catalyzed and divide
Solve 0.5-5 parts of formaldehyde active material, 40-70 parts of diatomite, 10-30 parts of binder, 90-220 parts of deionized water, filler 10-20
Part and dispersing agent 0.5-1.5 parts.
Further, catalytic decomposition formaldehyde activity ingredient is that formaldehyde nanometer is catalytically decomposed in activated manganese dioxide or manganese dioxide
Material.
Further, binder is hydroxypropyl methyl cellulose (HPMC), sodium metasilicate, polyethylene oxide (PEO), ethylene-
One or more of vinyl acetate co-polymer (EVA).
Further, filler includes one or more of quartz sand, talcum powder, attapulgite, sepiolite.
Further, dispersing agent includes one or more of sodium tripolyphosphate, triethyl group hexyl phosphoric acid, methyl anyl alcohol.
Further, the mass ratio that formaldehyde activity material and diatomite is catalytically decomposed is 1.2：10-5：10.
On the other hand, the invention further relates to a kind of methods for preparing above-mentioned diatom ooze coating comprising following steps：
(a) diatomite powder is add to deionized water, stirring forms suspension；
(b) potassium permanganate is added in the suspension of step (a) preparation, is stirred while adding 1-2 hours；
(c) mixing liquid of step (b) is added in ultrasonic wave pond, the frequency 30-50kHz in ultrasonic wave pond, water temperature is set
25-60 DEG C, manganese sulfate and potassium hydroxide is then added, it is 6-12 hours still aging after reacting 1-2 hours, then carry out solid-liquid
Separation, is then washed, and the mud cake that water content is 30-50% is made；
(d) mud cake made from step (c) is taken, is uniformly mixed after binder, filler and dispersing agent is added, water is added to be adjusted to contain
Water is the body of paste of 55-65%.
Further, further comprising the steps of between step (b) and step (c)：It is small that the liquid of step (b) is stood into 3-4
When.
Further, in step (c), the preferred 40kHz of the frequency in ultrasonic wave pond, preferably 40 DEG C of water temperature.
Further, in step (c), the water content of mud cake preferably 40%, the water content of body of paste preferably 60%.
Beneficial effects of the present invention：
1, the present invention uses activated manganese dioxide or manganese dioxide constant temperature catalyzing decomposing formaldehyde nano material, can be normal
The lower catalysis Formaldehyde decomposition of temperature is carbon dioxide and water, reaches the problem of thoroughly eliminating formaldehyde.
2, when by the load of room temperature decomposing formaldehyde active material over celite, by the way of ultrasonic wave aid dispersion,
Manganese bioxide material can be sufficiently dispersed to the load of diatomite pore interior, and then reach the face of the modified hole of active material
Product maximizes, and obtains sufficiently high activated adoption pore area, and then improve the decomposition removal rate of formaldehyde.
3, diatomite paint of the invention has had both the organic pollutants such as absorption and chemical breakdown two ways removal formaldehyde,
It is good to pollute removal effect, is less prone to secondary pollution.
4, diatom ooze coating of the invention eliminates that decomposing formaldehyde pollutant is convenient and efficient, do not need other ancillary measure and
Equipment, it is very useful.
Specific embodiment
Principles and features of the present invention are described with reference to embodiments, the given examples are served only to explain the present invention,
It is not intended to limit the range of the use of the new type.
Embodiment 1：
The diatom ooze coating of constant temperature catalyzing decomposing formaldehyde is prepared, is carried out in accordance with the following steps：
(a) take 50 parts of diatomite powders in 200 parts of deionized waters, stirring forms suspension；
(b) it takes 5 parts of potassium permanganate that the suspension of step (a) preparation is added, stirs while adding, after stirring 1.5 hours again
3 hours are stood, keeps load abundant.
(c) will be in the addition ultrasonic wave pond of the liquid of step (b), the frequency 45kHz in setting ultrasonic wave pond, 50 DEG C of water temperature,
Then 2.5 parts of manganese sulfates, 1 part of potassium hydroxide is added.Still aging 12 hours after reacting 2 hours, carried out using the machine of suction filtration, then
It is washed, manganese dioxide catalytic decomposition formaldehyde nano material is made and is adsorbed on the modification infusorial earth inside diatomite duct.Water
Mud cake moisture control after washing is 40%.
(d) 100 parts of mud cakes are taken, 15 parts of HPMC, 5 parts of sodium metasilicate, 1 part of sodium tripolyphosphate, 10 parts of quartz sands are added, 5 parts recessed
It is uniformly mixed after convex stick soil, water is added to be adjusted to aqueous 60% body of paste.The diatom ooze of constant temperature catalyzing decomposing formaldehyde is prepared to obtain the final product
Coating.
Embodiment 2：
The diatom ooze coating of constant temperature catalyzing decomposing formaldehyde is prepared, is carried out in accordance with the following steps：
(a) take 40 parts of diatomite powders in 100 parts of deionized waters, stirring forms suspension；
(b) it takes 5 parts of potassium permanganate that the suspension of step (a) preparation is added, stirs while adding, after stirring 1.5 hours again
3 hours are stood, keeps load abundant.
(c) will be in the addition ultrasonic wave pond of the liquid of step (b), the frequency 45kHz in setting ultrasonic wave pond, 50 DEG C of water temperature,
Then 3 parts of manganese sulfates, 1 part of potassium hydroxide is added.Still aging 12 hours after reacting 2 hours, carried out using the machine of suction filtration, then into
Row washing is made manganese dioxide catalytic decomposition formaldehyde nano material and is adsorbed on the modification infusorial earth inside diatomite duct.Washing
Mud cake moisture control afterwards is 40%.
(d) 100 parts of mud cakes are taken, 10 parts of ethylene-vinyl acetate copolymers (EVA), 0.5 part of triethyl group hexyl phosphorus are added
Acid, 5 parts of talcum powder are uniformly mixed after 5 parts of sepiolites, water are added to be adjusted to aqueous 60% body of paste.Constant temperature catalyzing is prepared to obtain the final product
The diatom ooze coating of decomposing formaldehyde.
Embodiment 3：
The diatom ooze coating of constant temperature catalyzing decomposing formaldehyde is prepared, is carried out in accordance with the following steps：
(a) take 70 parts of diatomite powders in 220 parts of deionized waters, stirring forms suspension；
(b) it takes 5 parts of potassium permanganate that the suspension of step (a) preparation is added, stirs while adding, after stirring 1.5 hours again
3 hours are stood, keeps load abundant.
(c) will be in the addition ultrasonic wave pond of the liquid of step (b), the frequency 45kHz in setting ultrasonic wave pond, 50 DEG C of water temperature,
Then 1 part of manganese sulfate, 1 part of potassium hydroxide is added.Still aging 12 hours after reacting 2 hours, carried out using the machine of suction filtration, then into
Row washing is made manganese dioxide catalytic decomposition formaldehyde nano material and is adsorbed on the modification infusorial earth inside diatomite duct.Washing
Mud cake pigment afterwards are controlled 40%.
(d) 100 parts of mud cakes are taken, 10 parts of hydroxypropyl methyl celluloses (HPMC), 20 parts of sodium metasilicate, 1.5 parts of trimerization phosphorus are added
It is uniformly mixed after sour sodium, 20 parts of talcum powder, water is added to be adjusted to aqueous 60% body of paste.Constant temperature catalyzing decomposing formaldehyde is prepared to obtain the final product
Diatom ooze coating.
Embodiment 4：
The diatom ooze coating of constant temperature catalyzing decomposing formaldehyde is prepared, is carried out in accordance with the following steps：
(a) take 55 parts of diatomite powders in 150 parts of deionized waters, stirring forms suspension；
(b) it takes 5 parts of potassium permanganate that the suspension of step (a) preparation is added, stirs while adding, after stirring 1.5 hours again
3 hours are stood, keeps load abundant.
(c) will be in the addition ultrasonic wave pond of the liquid of step (b), the frequency 45kHz in setting ultrasonic wave pond, 50 DEG C of water temperature,
Then 3 parts of manganese sulfates, 1 part of potassium hydroxide is added.Still aging 12 hours after reacting 2 hours, carried out using the machine of suction filtration, then into
Row washing is made manganese dioxide catalytic decomposition formaldehyde nano material and is adsorbed on the modification infusorial earth inside diatomite duct.Washing
Mud cake pigment afterwards are controlled 40%.
(d) 100 parts of mud cakes are taken, is uniformly mixed after 10 parts of PEO, 0.75 part of methyl anyl alcohol, 15 parts of sepiolites are added, adds water tune
Save into aqueous 60% body of paste.The diatom ooze coating of constant temperature catalyzing decomposing formaldehyde is prepared to obtain the final product.
Embodiment 5：
The diatom ooze coating of preparation catalytic decomposition formaldehyde, carries out in accordance with the following steps：
(a) take 50 parts of diatomite powders in 200 parts of deionized waters, stirring forms suspension；
(b) it takes 3 parts of potassium permanganate that the suspension of step (a) preparation is added, stirs while adding, it is quiet again after stirring 1 hour
It sets 3 hours, keeps load abundant.
(c) will be in the addition ultrasonic wave pond of the liquid of step (b), the frequency 40kHz in setting ultrasonic wave pond, 30 DEG C of water temperature,
Then 2 parts of manganese sulfates, 1 part of potassium hydroxide is added.Still aging 10 hours after reacting 1.5 hours, using small-sized filter press into
Row, then washed, manganese dioxide catalytic decomposition formaldehyde nano material is made and is adsorbed on the modification diatom inside diatomite duct
Soil.Mud cake moisture after washing is controlled 35%.
(d) 80 parts of mud cakes are taken, are added 10 parts of HPMC, 3 parts of PEO, 2 parts of EVA, 1 part of triethyl group hexyl phosphoric acid, 5 parts of quartz sands,
It is uniformly mixed after 5 parts of attapulgites, 5 parts of sepiolite powders, water is added to be adjusted to aqueous 55% body of paste.Constant temperature catalyzing is prepared to obtain the final product
The diatom ooze coating of decomposing formaldehyde.
Embodiment 6：
The diatom ooze coating of preparation catalytic decomposition formaldehyde, carries out in accordance with the following steps：
(a) take 50 parts of diatomite powders in 200 parts of deionized waters, stirring forms suspension；
(b) it takes 3 parts of potassium permanganate that the suspension of step (a) preparation is added, stirs while adding, it is quiet again after stirring 1 hour
It sets 3 hours, keeps load abundant.
(c) will be in the addition ultrasonic wave pond of the liquid of step (b), the frequency 40kHz in setting ultrasonic wave pond, 30 DEG C of water temperature,
Then 2 parts of manganese sulfates, 1 part of potassium hydroxide is added.Still aging 10 hours after reacting 1.5 hours, using small-sized filter press into
Row, then washed, manganese dioxide catalytic decomposition formaldehyde nano material is made and is adsorbed on the modification diatom inside diatomite duct
Soil.Mud cake moisture after washing is controlled 30%.
(d) 70 parts of mud cakes are taken, 5 parts of HPMC, 8 parts of sodium metasilicate, 2 parts of EVA, 1 part of triethyl group hexyl phosphoric acid, 5 parts of quartz is added
Sand is uniformly mixed after 10 parts of talcum powder, water is added to be adjusted to aqueous 55% body of paste.Constant temperature catalyzing decomposing formaldehyde is prepared to obtain the final product
Diatom ooze coating.
Embodiment 7：
The diatom ooze coating of preparation catalytic decomposition formaldehyde, carries out in accordance with the following steps：
(a) take 60 parts of diatomite powders in 150 parts of deionized waters, stirring forms suspension；
(b) it takes 3 parts of potassium permanganate that the suspension of step (a) preparation is added, stirs while adding, it is quiet again after stirring 1 hour
It sets 3 hours, keeps load abundant.
(c) will be in the addition ultrasonic wave pond of the liquid of step (b), the frequency 40kHz in setting ultrasonic wave pond, 30 DEG C of water temperature,
Then 3 parts of manganese sulfates, 1 part of potassium hydroxide is added.Still aging 10 hours after reacting 1.5 hours, using small-sized filter press into
Row, then washed, manganese dioxide catalytic decomposition formaldehyde nano material is made and is adsorbed on the modification diatom inside diatomite duct
Soil.Mud cake pigment after washing are controlled 30%.
(d) 65 parts of mud cakes are taken, 10 parts of HPMC, 5 parts of PEO, 1 part of sodium tripolyphosphate, 10 parts of attapulgites, 5 parts of Hai Pao are added
It is uniformly mixed after mountain flour, water is added to be adjusted to aqueous 55% body of paste.The diatom mash of constant temperature catalyzing decomposing formaldehyde is prepared to obtain the final product
Material.
Embodiment 8：
The diatom ooze coating of preparation catalytic decomposition formaldehyde, carries out in accordance with the following steps：
(a) take 70 parts of diatomite powders in 200 parts of deionized waters, stirring forms suspension；
(b) it takes 3 parts of potassium permanganate that the suspension of step (a) preparation is added, stirs while adding, it is quiet again after stirring 1 hour
It sets 3 hours, keeps load abundant.
(c) will be in the addition ultrasonic wave pond of the liquid of step (b), the frequency 40kHz in setting ultrasonic wave pond, 30 DEG C of water temperature,
Then 2.5 parts of manganese sulfates, 1 part of potassium hydroxide is added.Still aging 10 hours after reacting 1.5 hours, using small-sized filter press
It carries out, then is washed, manganese dioxide catalytic decomposition formaldehyde nano material is made and is adsorbed on the modified silicon inside diatomite duct
Diatomaceous earth.Mud cake pigment after washing are controlled 50%.
(d) 130 parts of mud cakes are taken, 10 parts of HPMC, 5 parts of EVA, 1 part of triethyl group hexyl phosphoric acid, 5 parts of talcum powder, 10 Hai Pao are added
It is uniformly mixed after mountain flour, water is added to be adjusted to aqueous 55% body of paste.The diatom mash of constant temperature catalyzing decomposing formaldehyde is prepared to obtain the final product
Material.
Comparative example：
Traditional diatom ooze coating is prepared, is carried out in accordance with the following steps：
(a) 30 parts of diatomites in powder, 20 parts of kaolin powder, 2 parts of zinc oxide, 8 parts of latex powders, 5 parts of embossing powders is taken to be added to often
It is mixed evenly in 50 parts of water of temperature.Then 0.1 part and 0.1 part 0.1 part of dispersing agent Sodium Polyacrylate, silicone oil carboxylic first are added
Base cellulose continues stirring 1 hour, stands 1 hour up to traditional diatom ooze coating.
Embodiment：
Above-described embodiment 1-8 and the diatom ooze coating of comparative example are smeared in space surrounding in 100 cubic spaces respectively
At 1mm left and right thickness, after drying in the air 7 days, 1ppm formaldehyde is generated using formaldehyde generator in space.2 as a child measure a first
Aldehyde concentration, 24 as a child measure a concentration of formaldehyde, then place heater indoors, room temperature is heated to 30 degree and is surveyed again
A concentration of formaldehyde is measured, it is as a result as follows：
The concentration of formaldehyde in space measured after 1. different time of table
| 2 hours | 24 hours | By heating after 7 days | |
| Embodiment 1 | 0.015ppm | 0.005ppm | 0.006ppm |
| Embodiment 2 | 0.01ppm | 0.005ppm | 0.004ppm |
| Embodiment 3 | 0.015ppm | 0.005ppm | 0.006ppm |
| Embodiment 4 | 0.01ppm | 0.005ppm | 0.003ppm |
| Embodiment 5 | 0.015ppm | 0.005ppm | 0.005ppm |
| Embodiment 6 | 0.02ppm | 0.005ppm | 0.004ppm |
| Embodiment 7 | 0.015ppm | 0.01ppm | 0.006ppm |
| Embodiment 8 | 0.01ppm | 0.005ppm | 0.007ppm |
| Comparative example | 0.1ppm | 0.01ppm | 0.1ppm |
According to the Contrast on effect of having a try of above-described embodiment it is found that diatom ooze coating prepared by the present invention has higher formaldehyde
Removal efficiency, and heated again after prolonged absorption and promote formaldehyde secondary precipitation, acquisition the result is that traditional diatom
The part formaldehyde of absorption is re-released into space by slime paint, and diatom ooze coating of the invention does not have release to be adsorbed substantially
Formaldehyde.Diatom ooze coating of the invention has better adsorption-decomposition function effect, and will not generate secondary pollution.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of diatom ooze coating that formaldehyde is catalytically decomposed, it is characterised in that：By weight, including first is catalytically decomposed in the coating
0.5-5 parts of aldehyde active material, 40-70 parts of diatomite, 10-30 parts of binder, 90-220 parts of deionized water, 10-20 parts of filler and
0.5-1.5 parts of dispersing agent.
2. diatom ooze coating according to claim 1, it is characterised in that：The catalytic decomposition formaldehyde activity ingredient is activity
Formaldehyde nano material is catalytically decomposed in manganese dioxide or manganese dioxide.
3. diatom ooze coating according to claim 1, it is characterised in that：The binder is hydroxypropyl methyl cellulose
(HPMC), one or more of sodium metasilicate, polyethylene oxide (PEO), ethylene-vinyl acetate copolymer (EVA).
4. diatom ooze coating according to claim 1, it is characterised in that：The filler includes quartz sand, talcum powder, recessed
One or more of convex stick soil, sepiolite.
5. diatom ooze coating according to claim 1, it is characterised in that：The dispersing agent includes sodium tripolyphosphate, three
One or more of ethylhexyl phosphoric acid, methyl anyl alcohol.
6. diatom ooze coating described in -5 any one according to claim 1, the catalytic decomposition formaldehyde activity material and silicon
The mass ratio of diatomaceous earth is 1.2：10-5：10.
7. a kind of method for preparing diatom ooze coating as claimed in any one of claims 1 to 6 comprising following steps：
(a) diatomite powder is add to deionized water, stirring forms suspension；
(b) potassium permanganate is added in the suspension of step (a) preparation, is stirred while adding 1-2 hours；
(c) mixing liquid of step (b) is added in ultrasonic wave pond, the frequency 30-50kHz, water temperature 25-60 in ultrasonic wave pond is set
DEG C, manganese sulfate and potassium hydroxide is then added, it is 6-12 hours still aging after reacting 1-2 hours, then be separated by solid-liquid separation,
Then it is washed, the mud cake that water content is 30-50% is made；
(d) mud cake made from step (c) is taken, is uniformly mixed after binder, filler and dispersing agent is added, water is added to be adjusted to water content
For the body of paste of 55-65%.
8. preparation method according to claim 7, it is characterised in that：It further include following step between step (b) and step (c)
Suddenly：The liquid of step (b) is stood 3-4 hours.
9. according to the method described in claim 7, it is characterized in that：In step (c), the frequency in the ultrasonic wave pond is preferred
40kHz, preferably 40 DEG C of water temperature.
10. according to the method described in claim 7, it is characterized in that：In step (c), the water content of the mud cake is preferred
40%, the water content of the body of paste preferably 60%.
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Application publication date: 20181130 |