CN112094683A - Release agent and preparation method and application thereof - Google Patents
Release agent and preparation method and application thereof Download PDFInfo
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- CN112094683A CN112094683A CN202010827981.2A CN202010827981A CN112094683A CN 112094683 A CN112094683 A CN 112094683A CN 202010827981 A CN202010827981 A CN 202010827981A CN 112094683 A CN112094683 A CN 112094683A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
- B28B7/384—Treating agents
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/003—Inorganic compounds or elements as ingredients in lubricant compositions used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/04—Elements
- C10M2201/041—Carbon; Graphite; Carbon black
- C10M2201/0413—Carbon; Graphite; Carbon black used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
- C10M2209/084—Acrylate; Methacrylate
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
- C10M2209/086—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type polycarboxylic, e.g. maleic acid
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/12—Polysaccharides, e.g. cellulose, biopolymers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/10—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring
- C10M2219/104—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring containing sulfur and carbon with nitrogen or oxygen in the ring
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Lubricants (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention relates to the field of release agents, and particularly relates to a release agent and a preparation method and application thereof. The release agent comprises the following components in percentage by mass: 1-5 wt% of boron nitride, 7-15 wt% of graphite, 0.02-0.05 wt% of surfactant and 0.01-0.04 wt% of dispersant; wherein the pH value of the release agent is 8-10. The release agent is particularly suitable for boron carbide/rare earth oxide-based protective ceramics, and can simultaneously meet the requirements of release treatment of cold and hot pressing procedures. The release agent not only meets the demoulding treatment of the cold-pressed green blank in the ceramic preparation process, but also can prevent the adhesion of a hot-pressing mold and a sample piece, thereby reducing the production cost and the labor and time cost consumed by mold cleaning, mold surface defect repair and sample piece surface impurity removal.
Description
Technical Field
The invention relates to the field of release agents, and particularly relates to a release agent and a preparation method and application thereof.
Background
In the pre-forming process of metal, ceramic and high polymer materials, how to stably separate a target sample piece from a mold is always an exploratory hot point; especially, due to the unique shape of the special-shaped functional ceramic, the special-shaped part is stressed unevenly so that the partial strength is poor, and the demolding effect of the demolding agent is particularly important.
Taking boron carbide special-shaped ceramic sintering as an example, common carbon paper is used for isolating a sample piece from a mold, 3-5 layers are usually laid, and the surface of the sample piece needs to be polished at the later stage to remove residual carbon paper, so that the carbon paper meeting the furnace entering requirement has high standards on purity and size. Therefore, in order to industrially produce the special-shaped ceramic, the release agent which has controllable shape, no impurity residue and low cost needs to be developed.
The release agents are usually divided into cold-pressing release agents and hot-pressing release agents, and because the use conditions of the two types of release agents are greatly different, an intersection is always formed. At present, reports about a release agent simultaneously used in two processes of cold and hot pressing and a preparation method thereof are blank. The release agent which can simultaneously meet two procedures of hot pressing is developed, the shape of the release agent is controllable, no impurity residue is left, the cost is low, and the release agent has important significance for promoting the industrialized production of the anisotropic ceramics.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a release agent and a preparation method and application thereof.
As a first object of the present invention, there is provided a mold release agent; the release agent is especially suitable for boron carbide/rare earth oxide-based protective ceramics, and can simultaneously meet the requirements of release treatment of cold and hot pressing procedures. Namely, the release agent can solve the problem of difficult release caused by weak strength of the cold-pressed green blank and the problem of adhesion between a hot-pressing die and a sample piece.
Specifically, the release agent comprises the following components in percentage by mass:
wherein the pH value of the release agent is 8-10.
In the prior art, when ceramics are prepared by cold pressing, the ceramic piece is seriously adhered to a die due to the stamping and die expanding, so that a green body is damaged; when ceramics are prepared by high-temperature sintering, pores on the surface are carburized after a ceramic bonding phase is generated, so that a mold is damaged, and a ceramic piece is damaged. The invention has the advantages that the release agent comprising the components in percentage by mass not only meets the demoulding treatment of the cold-pressed green blank in the ceramic preparation process, but also can prevent the adhesion of a hot-pressing mould and a sample piece, thereby reducing the production cost and reducing the labor and time cost consumed by mould cleaning, mould surface defect repair and sample piece surface decontamination.
Preferably, the boron nitride D50 is 0.5-10 μm; the graphite D50 is 1-15 mu m;
and the mass percentage of the graphite is 2-10 times of that of the boron nitride in terms of the total mass of the release agent.
In the research of the invention, the invention further discovers that when the boron nitride and the graphite meet the conditions, the obtained release agent can not introduce new impurity phases into the sample piece, and can protect the sample piece to be clean and smooth; and the ablation can be compensated by the matching use of the boron nitride and the graphite, so that the mold is protected, and the service life of the mold is prolonged.
Preferably, the surfactant is one or more selected from PEG6000, carboxymethyl cellulose and fatty alcohol-polyoxyethylene ether.
Preferably, the dispersant is a polymeric dispersant; ammonium citrate and/or ammonium polycarboxylate salts are preferred.
Preferably, ammonia or ammonium citrate and citric acid pH buffer pairs are used as pH regulators.
In the present invention, the specific surfactant and dispersant act together with boron nitride and graphite, and the mold release effect of the mold release agent is further improved.
Preferably, the release agent further comprises a thickening agent and a preservative;
the thickening agent comprises a polyacrylic resin emulsion thickening agent and colloid, wherein the colloid is yellow collagen and/or guar gum; the viscosity of the thickener is 4200-4500 cps;
the preservative is selected from one or more of methylisothiazolinone, benzisothiazolinone and carbazone.
The invention discovers that a thickener system consisting of a polyacrylic resin emulsion thickener and colloid (collagen and/or guar gum) has good film forming property, can penetrate the edge of a ceramic piece green body, can obviously increase the edge strength after drying, is not suitable for edge cracking, can be quickly discharged in sintering degreasing, has extremely low ash content, and improves the firing rate.
Preferably, the release agent comprises the following components in percentage by mass:
wherein the pH value of the release agent is 8-10.
Further, the release agent comprises the following components in percentage by mass:
wherein the pH value of the release agent is 8-10.
As a better technical scheme of the invention, the release agent comprises the following components in percentage by mass:
wherein the pH value of the release agent is 8.
As a second object of the present invention, there is provided a process for producing the above mold release agent;
specifically, the preparation method comprises the following steps:
(1) mixing a polyacrylic acid resin emulsion thickener and a colloid, adjusting the viscosity to 4200-4500 cps, and stirring to form a suspension-free milky viscous liquid;
(2) mixing boron nitride and graphite, adding the mixture into the suspension-free milky viscous liquid, and uniformly stirring to obtain a premixed viscous liquid I;
(3) sequentially adding a surfactant and a dispersant into the premixed viscous liquid I, adjusting the pH value of a system to 8-10, and uniformly stirring to obtain a premixed viscous liquid II;
(4) adding a preservative into the premixed viscous liquid II, and uniformly stirring to obtain viscous liquid;
(5) and performing ball milling on the viscous liquid, and standing.
In the technical scheme, in the step (1), the stirring is carried out for 60-120 min at the speed of 20-60 r/min; in the steps (2) to (4), the stirring is carried out at 50-60 r/min; and in the step (2), the mixture of the boron nitride and the graphite is added into the suspension-free milky viscous liquid for a plurality of times in a small amount, and if the stirring resistance is larger, the rotating speed can be properly increased.
Preferably, in the step (5), the ball-milled grinding balls are zirconia or alumina with the diameter of 8-10 mm, and the ball-to-material ratio is 2-3: 1; the ball milling time is 12-36 h; the ball milling is carried out according to the above conditions, so that the components can be uniformly mixed to the maximum extent.
Preferably, in the step (5), standing is carried out for 6-8 hours.
In the invention, a suspension colloidal liquid is obtained after standing for 6-8 h, and the suspension colloidal liquid is the release agent.
As a third object of the present invention, there is provided the use of the above-mentioned mold release agent for the preparation of ceramics.
Preferably, the ceramic is a boron carbide/rare earth oxide based protective ceramic.
The release agent is particularly suitable for boron carbide/rare earth oxide-based protective ceramics. In addition, the release agent has the advantages of simple use steps, short drying period, less sample piece residue, environmental protection and safety; it is worth noting that the release agent can not introduce impurities in the process of manufacturing the green blank and the finished plate, and the quality and the surface cleanliness of the sample piece are ensured.
Preferably, if the ceramic is prepared by adopting a cold press molding process, the release agent is uniformly coated on the inner surface of the mold and dried;
if the ceramic is prepared by adopting a hot-pressing sintering process, the release agent is uniformly coated on the inner surface of the mold, and after drying, the coating is repeated for 5-8 times.
Particularly, the release agent can be dipped in a small amount by utilizing a fiber brush and uniformly coated on the inner surface of a mold with the risk of wall sticking, a blower blows for 30-120 s until no obvious fingerprint is touched by fingers, and the step of loading and pressing can be carried out by observing the part without leaving and leaking in the head-on direction. Particularly, in the hot-pressing sintering process, the step needs to be repeated for 5-8 times because the release agent is consumed and the contact surface is more.
The invention has the beneficial effects that:
(1) the invention innovatively provides the cold-hot-pressing dual-purpose release agent, namely, the release agent required by cold pressing and hot pressing processes is combined into a whole, so that the probability of introducing impurities is reduced.
(2) The release agent also has the function of strengthening the edge of the cold pressing preformed piece, and the yield of the green blank is greatly improved.
(3) According to the invention, polyacrylic resin emulsion thickener and colloid are selected as thickener systems, so that the residual rate of sintering infiltration ash is reduced; and the lubricating main body is compounded by adopting boron nitride and graphite, so that ablation can be complemented, a sample piece is complete, and time cost brought by die cleaning and surface repairing is saved.
(4) The ceramic piece prepared by the release agent does not need to be subjected to subsequent treatment.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
The embodiment provides a mold release agent, which comprises the following components in percentage by mass:
wherein the pH value of the release agent is 8.
The embodiment also provides a preparation method of the release agent, which comprises the following steps:
(1) mixing polyacrylic resin emulsion thickener and xanthan gum, adjusting viscosity to 4200cps, stirring at 30r/min for 120min to form suspension-free milky viscous liquid;
(2) after mixing boron nitride and graphite, adding the mixture into the suspension-free milky viscous liquid for a plurality of times in a small amount, adjusting the stirring speed to 50r/min, and uniformly stirring to obtain a premixed viscous liquid I;
(3) sequentially adding carboxymethyl cellulose and an ammonium polycarboxylate polymeric dispersant into the premixed viscous liquid I, taking ammonium citrate and a citric acid PH buffer pair as pH regulators, regulating the pH value of a system to 8, and uniformly stirring to obtain a premixed viscous liquid II;
(4) adding methylisothiazolinone into the premixed viscous liquid II, and uniformly stirring to obtain viscous liquid;
(5) sealing the viscous liquid into a ball milling tank for ball milling and uniformly mixing treatment, wherein the ball-material ratio is 2: 1, selecting 8mm zirconia as grinding balls, carrying out ball milling for 24 hours, and standing for 6 hours after the grinding balls are screened out.
Example 2
The embodiment provides a mold release agent, which comprises the following components in percentage by mass:
wherein the pH value of the release agent is 8.
The embodiment also provides a preparation method of the release agent, which comprises the following steps:
(1) mixing polyacrylic resin emulsion thickener and xanthan gum, adjusting viscosity to 4200cps, stirring at 30r/min for 120min to form suspension-free milky viscous liquid;
(2) after mixing boron nitride and graphite, adding the mixture into the suspension-free milky viscous liquid for a plurality of times in a small amount, adjusting the stirring speed to 50r/min, and uniformly stirring to obtain a premixed viscous liquid I;
(3) sequentially adding carboxymethyl cellulose and an ammonium polycarboxylate polymeric dispersant into the premixed viscous liquid I, taking ammonium citrate and a citric acid PH buffer pair as pH regulators, regulating the pH value of a system to 8, and uniformly stirring to obtain a premixed viscous liquid II;
(4) adding methylisothiazolinone into the premixed viscous liquid II, and uniformly stirring to obtain viscous liquid;
(5) sealing the viscous liquid into a ball milling tank for ball milling and uniformly mixing treatment, wherein the ball-material ratio is 2: 1, selecting 8mm zirconia as grinding balls, carrying out ball milling for 24 hours, and standing for 6 hours after the grinding balls are screened out.
Example 3
The embodiment provides a mold release agent, which comprises the following components in percentage by mass:
wherein the pH value of the release agent is 8.
The embodiment also provides a preparation method of the release agent, which comprises the following steps:
(1) mixing polyacrylic resin emulsion thickener and guar gum, adjusting viscosity to 4500cps, stirring at 60r/min for 120min to form suspension-free milky viscous liquid;
(2) after mixing boron nitride and graphite, adding the mixture into the suspension-free milky viscous liquid for a plurality of times in a small amount, adjusting the stirring speed to 60r/min, and uniformly stirring to obtain a premixed viscous liquid I;
(3) sequentially adding carboxymethyl cellulose and an ammonium polycarboxylate polymeric dispersant into the premixed viscous liquid I, taking ammonium citrate and a citric acid PH buffer pair as pH regulators, regulating the pH value of a system to 8, and uniformly stirring to obtain a premixed viscous liquid II;
(4) adding the benzisothiazolinone into the premixed viscous liquid II, and uniformly stirring to obtain viscous liquid;
(5) sealing the viscous liquid into a ball milling tank for ball milling and uniformly mixing treatment, wherein the ball-material ratio is 2: 1, selecting 8mm zirconia as grinding balls, carrying out ball milling for 24 hours, and standing for 6 hours after the grinding balls are screened out.
Comparative example 1
The comparative example provides a release agent which comprises the following components in percentage by mass:
wherein the pH value of the release agent is 8.
This comparative example also provides a method of preparing the release agent, comprising the steps of:
(1) mixing the aqueous pva gum and the guar gum, adjusting the viscosity to 10500cps, and stirring at 60r/min for 120min to form suspension-free milky viscous liquid;
(2) after mixing boron nitride and graphite, adding the mixture into the suspension-free milky viscous liquid for a plurality of times in a small amount, adjusting the stirring speed to 60r/min, and uniformly stirring to obtain a premixed viscous liquid I;
(3) sequentially adding carboxymethyl cellulose and an ammonium polycarboxylate polymeric dispersant into the premixed viscous liquid I, taking ammonium citrate and a citric acid PH buffer pair as pH regulators, regulating the pH value of a system to 8, and uniformly stirring to obtain a premixed viscous liquid II;
(4) adding the benzisothiazolinone into the premixed viscous liquid II, and uniformly stirring to obtain viscous liquid;
(5) sealing the viscous liquid into a ball milling tank for ball milling and uniformly mixing treatment, wherein the ball-material ratio is 2: 1, selecting 8mm zirconia as grinding balls, carrying out ball milling for 24 hours, and standing for 6 hours after the grinding balls are screened out.
The viscosity of the release agent obtained in the comparative example is too high, and is doubled compared with that of a polyacrylic resin emulsion thickener system, so that the release agent is not beneficial to later use.
Comparative example 2
The comparative example provides a release agent which comprises the following components in percentage by mass:
wherein the pH value of the release agent is 8.
This comparative example also provides a method of preparing the release agent, comprising the steps of:
(1) mixing polyacrylic resin emulsion thickener and guar gum, adjusting viscosity to 4500cps, stirring at 60r/min for 120min to form suspension-free milky viscous liquid;
(2) after mixing boron nitride and graphite, adding the mixture into the suspension-free milky viscous liquid for a plurality of times in a small amount, adjusting the stirring speed to 60r/min, and uniformly stirring to obtain a premixed viscous liquid I;
(3) sequentially adding carboxymethyl cellulose and a PC67 dispersing agent into the premixed viscous liquid I, taking ammonium citrate and a citric acid PH buffer pair as pH regulators, regulating the pH value of a system to be 8, and uniformly stirring to obtain a premixed viscous liquid II;
(4) adding the benzisothiazolinone into the premixed viscous liquid II, and uniformly stirring to obtain viscous liquid;
(5) sealing the viscous liquid into a ball milling tank for ball milling and uniformly mixing treatment, wherein the ball-material ratio is 2: 1, selecting 8mm zirconia as grinding balls, carrying out ball milling for 24 hours, and standing for 6 hours after the grinding balls are screened out.
When the ceramics prepared by using the release agent of the comparative example is subjected to XRD phase scanning on the edge sample preparation of a sintered plate, Na salt substances cannot be discharged, and the influence on the edge and surface hardness of the ceramics caused by the fact that the release agent impurities permeate into the ceramic matrix through cold pressing and hot pressing procedures is shown.
Test example 1
In the test example, the release agents of examples 1 to 3 and comparative examples 1 to 2 were used to prepare boron carbide/rare earth oxide-based protective ceramics; the specific operation is as follows:
(1) ceramic prepared by adopting cold press molding process
And (3) dipping the release agents by using a fiber brush in a small amount respectively, uniformly coating the release agents on the inner surface of a mold with a wall sticking risk, blowing by using a blower for 60s, touching by fingers without obvious fingerprints, observing without missing and leaking parts in a head-on manner, and loading and pressing.
(2) Ceramic preparation by hot-pressing sintering process
And (3) dipping a small amount of the release agents by using a fiber brush, uniformly coating the release agents on the inner surface of the hot-pressing graphite mold, blowing by using a blower for 60s, observing the finger without obvious fingerprints in a head-on manner, observing the part without leakage, and repeating the steps for 6 times to perform a subsequent sintering process.
Demolding the prepared ceramic piece and observing the molding effect of the ceramic piece; wherein:
very good: the demolding effect is very good, and the mold part is automatically separated from the mold
O: good demoulding effect, and easy release of the mould
And (delta): the demoulding effect is general, and the mould part needs to be separated from the mould by external force
X: poor release effect, the mold part can not be separated from the mold
Observing the demoulded module and evaluating the surface forming effect of the demoulded module; wherein:
very good: very smooth and non-adhesive surface of the mould
O: the mould has smooth surface and slightly sticky edges
And (delta): the module surface is stuck in large blocks, and the edge is broken and stuck
X: the surface of the module is stuck in large blocks, the edge of the module is seriously broken, and the sticking pattern is very fuzzy
The test results are shown in table 1;
TABLE 1 test results
Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that many modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The release agent is characterized by comprising the following components in percentage by mass:
wherein the pH value of the release agent is 8-10.
2. The release agent as claimed in claim 1, wherein the boron nitride D50 is 0.5 to 10 μm; the graphite D50 is 1-15 mu m;
and the mass percentage of the graphite is 2-10 times of that of the boron nitride in terms of the total mass of the release agent.
3. The release agent as claimed in claim 1, wherein the surfactant is selected from one or more of PEG6000, carboxymethyl cellulose and fatty alcohol-polyoxyethylene ether;
and/or the dispersant is a polymer dispersant; preferably ammonium citrate and/or ammonium polycarboxylate;
and/or ammonia water or ammonium citrate and citric acid pH buffer pair are used as pH regulators.
4. The release agent according to any one of claims 1 to 3, wherein the release agent further comprises a thickener and a preservative;
the thickening agent comprises a polyacrylic resin emulsion thickening agent and colloid, wherein the colloid is yellow collagen and/or guar gum; the viscosity of the thickener is 4200-4500 cps;
the preservative is selected from one or more of methylisothiazolinone, benzisothiazolinone and carbazone.
5. The release agent as claimed in claim 4, characterized by comprising the following components in percentage by mass:
wherein the pH value of the release agent is 8-10.
6. The release agent as claimed in claim 5, characterized by comprising the following components in percentage by mass:
wherein the pH value of the release agent is 8-10;
preferably, the release agent comprises the following components in percentage by mass:
wherein the pH value of the release agent is 8.
7. The method for producing the release agent according to any one of claims 1 to 6, characterized by comprising the steps of:
(1) mixing a polyacrylic acid resin emulsion thickener and a colloid, adjusting the viscosity to 4200-4500 cps, and stirring to form a suspension-free milky viscous liquid;
(2) mixing boron nitride and graphite, adding the mixture into the suspension-free milky viscous liquid, and uniformly stirring to obtain a premixed viscous liquid I;
(3) sequentially adding a surfactant and a dispersant into the premixed viscous liquid I, adjusting the pH value of a system to 8-10, and uniformly stirring to obtain a premixed viscous liquid II;
(4) adding a preservative into the premixed viscous liquid II, and uniformly stirring to obtain viscous liquid;
(5) and performing ball milling on the viscous liquid, and standing.
8. The preparation method according to claim 7, wherein in the step (5), the ball-milled grinding balls are zirconia or alumina with the diameter of 8-10 mm, and the ball-to-material ratio is 2-3: 1; the ball milling time is 12-36 h.
9. Use of the mold release agent according to any one of claims 1 to 6 for the preparation of ceramics;
preferably, the ceramic is a boron carbide/rare earth oxide based protective ceramic.
10. The use according to claim 9, wherein, if the ceramic is prepared by a cold press molding process, the release agent is uniformly coated on the inner surface of the mold and dried;
if the ceramic is prepared by adopting a hot-pressing sintering process, the release agent is uniformly coated on the inner surface of the mold, and after drying, the coating is repeated for 5-8 times.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112852533A (en) * | 2021-01-12 | 2021-05-28 | 广西建工集团建筑产业投资有限公司 | Environment-friendly release agent for autoclaved aerated concrete blocks and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87102555A (en) * | 1986-04-04 | 1987-10-14 | 隆察股份公司 | The lubricant system of sheet material and bar and shape mill |
| CN101302110A (en) * | 2008-06-12 | 2008-11-12 | 上海交通大学 | Method for preparing large-size ceramic grinding ball and mould |
| CN101638606A (en) * | 2009-07-14 | 2010-02-03 | 荆门市兴泰工贸有限公司 | Environment friendly metal forging mold-releasing agent |
| CN102433201A (en) * | 2011-11-05 | 2012-05-02 | 安徽工业大学 | Light cured dry film lubricant |
| CN108018114A (en) * | 2016-10-31 | 2018-05-11 | 比亚迪股份有限公司 | A kind of boron nitride releasing agent and preparation method thereof |
| CN109943407A (en) * | 2019-04-10 | 2019-06-28 | 上海福岛新材料科技有限公司 | It is a kind of environmental protection forging use graphitic release agents |
-
2020
- 2020-08-17 CN CN202010827981.2A patent/CN112094683A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87102555A (en) * | 1986-04-04 | 1987-10-14 | 隆察股份公司 | The lubricant system of sheet material and bar and shape mill |
| CN101302110A (en) * | 2008-06-12 | 2008-11-12 | 上海交通大学 | Method for preparing large-size ceramic grinding ball and mould |
| CN101638606A (en) * | 2009-07-14 | 2010-02-03 | 荆门市兴泰工贸有限公司 | Environment friendly metal forging mold-releasing agent |
| CN102433201A (en) * | 2011-11-05 | 2012-05-02 | 安徽工业大学 | Light cured dry film lubricant |
| CN108018114A (en) * | 2016-10-31 | 2018-05-11 | 比亚迪股份有限公司 | A kind of boron nitride releasing agent and preparation method thereof |
| CN109943407A (en) * | 2019-04-10 | 2019-06-28 | 上海福岛新材料科技有限公司 | It is a kind of environmental protection forging use graphitic release agents |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112852533A (en) * | 2021-01-12 | 2021-05-28 | 广西建工集团建筑产业投资有限公司 | Environment-friendly release agent for autoclaved aerated concrete blocks and preparation method thereof |
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