CN113416430A - Preparation method and application of special nano calcium carbonate for polyurethane sealant - Google Patents
Preparation method and application of special nano calcium carbonate for polyurethane sealant Download PDFInfo
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/02—Compounds of alkaline earth metals or magnesium
- C09C1/021—Calcium carbonates
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- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/182—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/08—Treatment with low-molecular-weight non-polymer organic compounds
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/12—Treatment with organosilicon compounds
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention provides a preparation method and application of special nano calcium carbonate for polyurethane sealant, wherein the method comprises the following steps: (1) calcining macadam limestone to obtain CaO; (2) CaO is aged in water to obtain Ca (OH)2Brown stock which is then aged to obtain Ca (OH)2Fine sizing; then, adding clear water; (3) introducing CO2Carrying out carbonation reaction on the gas to prepare nano calcium carbonate slurry; (4) then adding the nano calcium carbonate slurry into a composite modifier solution for coating treatment; (5) Adding water, mixing, stirring, dehydrating, oven drying, and packaging when the water content is less than or equal to 0.26%. Compared with the common nano calcium carbonate product, the nano calcium carbonate prepared by the preparation method of the special nano calcium carbonate for the polyurethane sealant has more complete surface structure and product bulkiness, has good compatibility with the polyurethane sealant and strong mechanical property, and is beneficial to long-term storage.
Description
The technical field is as follows:
the invention relates to the technical field of nano calcium carbonate, in particular to a preparation method and application of special nano calcium carbonate for polyurethane sealant.
Background art:
in recent years, calcium carbonate products have found widespread use in many fields. For example, in the paper industry, calcium carbonate is valued for its high brightness, opacity and gloss, and is commonly used as a filler in the manufacture of bright, opaque paper. In addition, calcium carbonate is often used as an extender in paints and also as a filler in adhesives, sealants and plastics. In recent years, the polyurethane sealant has been widely applied. The polyurethane sealant is prepared by matching polyurethane prepolymer containing urethane (-NCO) group with filler, plasticizer and additive, and the product has good adhesive strength, low temperature resistance, wear resistance, oil resistance, chemical resistance, ozone resistance, bacteria resistance and other properties, so the polyurethane sealant has been widely applied to civil construction, transportation, electronic elements, packaging and other aspects.
The nano calcium carbonate is used as a common filler of the polyurethane sealant, can effectively improve the thixotropic property and the reinforcing property of a sealant system, but the existing special nano calcium carbonate product for the polyurethane sealant has the following defects: (1) crystal forms are not perfect, crystal water in the crystals is easy to migrate out in the storage and application processes, and (2) the surfaces of the crystals are usually and simply subjected to surface modification by adopting fatty acid or salt thereof, so that the hydrophobicity is poor, certain carboxyl and hydroxyl are easy to remain, and the reaction with carbamate on a polyurethane main chain is easy to carry out chemical reaction, release carbon dioxide and cause system pre-curing, so that the products have poor use performance in a polyurethane sealant system. In recent years, domestic researches and developments have been made on products, mainly aiming at surface modification of nano calcium carbonate to make it more hydrophobic, for example, CN201611020954.4 discloses a preparation method of nano calcium carbonate for water-resistant polyurethane glue. The product has some improvements in the field of polyurethane sealants, but the problems are not completely solved, the cost is high, and domestic polyurethane customers have to be prohibited.
The invention content is as follows:
the invention aims to overcome the defects of the prior art, and provides a preparation method of special nano calcium carbonate for polyurethane sealant, which can effectively inhibit the migration of crystal water, and has good compatibility, good storage stability and good mechanical property in a polyurethane system through hydrophobic modification.
The technical scheme for realizing the purpose of the invention is as follows: a preparation method of special nano calcium carbonate for polyurethane sealant comprises the following steps:
(1) calcining the crushed limestone at the temperature of 1000 ℃ and 1100 ℃ in a vertical kiln to obtain CaO, wherein the content of magnesium hydroxide in the crushed limestone is less than or equal to 0.5 percent;
(2) slaking the CaO obtained in step (1) in water to obtain Ca (OH) with the concentration of 15-20 wt% and the temperature of 80-95 DEG C2Brown stock, then Ca (OH)2The brown stock is passed through a vibrating screen and aged to obtain Ca (OH)2Fine sizing; then, clear water is added, Ca (OH)2Adjusting the concentration of the seminal plasma to 8-9 wt%, and the temperature is 55-60 ℃;
unlike conventional methods, the present invention, before carbonization, Ca (OH)2Directly adding clear water into the seminal plasma without cooling in a heat exchanger, adjusting the concentration to 8-9 wt%, and keeping the temperature at 55-60 deg.C (the conventional method is to pump the seminal plasma into an intermediate tank and age for more than 24 hours, cool the seminal plasma to 30-50 deg.C with air, cool the seminal plasma with the heat exchanger, then add clear water, reduce the concentration to 8-9 wt%, and reduce the temperature to about 25 deg.C);
(3) ca (OH) at a concentration of 8 to 9 wt% in step (2)20.8-2 wt% (CaCO) of calcium carbonate dry basis weight is added into the fine pulp3Dry basis mass calculation) of the composite crystal form control agent, and then introducing CO2The gas is carbonated (to reduce cost, kiln gas (CO) can be used240%) of low cost and containing CO2Until the pH of the reaction system is reduced to below 7.0, and the specific surface area is 12-18m2Per gram of nano calcium carbonate slurry 1;
in the step, the stirrer of the reactor is closed in the carbonation reaction process, the calcium hydroxide slurry is not stirred like the conventional preparation method, and tests prove that the development of crystals can be interfered without stirring;
(4) adding a composite modifier consisting of fatty acid or fatty acid salt, aliphatic aldehyde, phosphate and inert silicone oil into a reaction container for reaction to obtain a composite modifier solution with the dry mass of 2.5-3.5 wt%;
then conveying the nano calcium carbonate slurry 1 to an activation kettle, heating to 70 ℃, adding the composite modifier solution for coating treatment, and stirring for 40-50min to obtain modified nano calcium carbonate slurry 2;
(5) adding water into the modified nano calcium carbonate slurry 2 according to the proportion of 1:2-4, mixing, stirring, dehydrating, drying, and packaging in a crushing section when the water content is less than or equal to 0.26% to obtain the finished product of the special nano calcium carbonate for the polyurethane sealant.
The step is different from the conventional method that the modified nano calcium carbonate slurry is directly dehydrated and chain-type dried.
Preferably, in the step (2), the mass ratio of CaO to water is 1:4-6, the initial temperature of water is 45-50 ℃, and the stirring reaction is carried out for 5-15min to obtain Ca (OH) with the concentration of 15-20 wt% and the temperature of 80-95 DEG2And (4) coarse pulp.
Preferably, in the step (2), the vibrating screen is 80-120 meshes, and the aging time is 48-72 h.
Preferably, in the step (3), the composite crystal form control agent is one or more of organic acid, inorganic acid, Sr or Ba compound, monosaccharide or polysaccharide (such as citric acid, maleic acid, malic acid, malonic acid, phthalic acid, tartaric acid, boric acid, phosphoric acid, sulfurous acid, sulfuric acid, SrCl)2、BaCl2、Ba(ClO3)2、Ba(NO3)2、Sr(NO3)2、Sr(OH)2、Ba(OH)2Fructose, glucose, sucrose, maltose, lactose, starch, cellulose, glycogen, etc.).
Preferably, in the step (4), the reaction conditions of the composite modifier are as follows: the temperature is 85-90 ℃, the stirring speed is 400-.
Preferably, in the step (4), the aliphatic acid or fatty acid salt has a total amount of carbon atoms of from C4 to C24.
Preferably, in the step (4), the phosphate ester is a blend of a phosphate monoester and a phosphate diester.
Preferably, in the step (4), the aliphatic aldehyde is one or more of aliphatic aldehydes having 6 to 12 carbon atoms in any combination.
Preferably, in the step (4), the inert silicone oil is polydimethylsiloxane and a mixture thereof.
The invention also provides a polyurethane sealant, which comprises the following components: 350 parts of polyurethane prepolymer, 300 parts of DOP 260, 430 parts of nano calcium carbonate special for polyurethane sealant, 1.0-1.5 parts of triethylene diamine and 0.4-0.7 part of oxazolidine compound; the nano calcium carbonate special for the polyurethane sealant is prepared by the method.
The special nano calcium carbonate for the polyurethane sealant and the preparation method thereof have the beneficial effects that:
the invention provides a preparation method of special nano calcium carbonate for polyurethane sealant, which is different from the conventional carbonization method, and the obtained nano calcium carbonate is in a partial cylindrical crystal form by controlling raw materials and process conditions, has more perfect surface structure and product bulkiness than the common nano calcium carbonate product, has good compatibility with the polyurethane sealant and strong mechanical property after hydrophobic modification, and is beneficial to long-term storage.
Description of the drawings:
FIG. 1 is a morphology chart of the nano calcium carbonate special for polyurethane sealant in example 2 of the present invention;
FIG. 2 is a morphology chart of comparative example nano calcium carbonate.
The specific implementation mode is as follows:
the following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention more readily understood by those skilled in the art, and thus will more clearly and distinctly define the scope of the invention.
Example 1
A preparation method of special nano calcium carbonate for polyurethane sealant comprises the following steps:
(1) calcining macadam in a vertical kiln at 1000 ℃ to obtain CaO, wherein the content of magnesium hydroxide in the macadam is less than or equal to 0.5%;
(2) CaO and water are reacted according to a ratio of 1:5 to obtain Ca (OH) with a concentration of 18 wt% and a temperature of 83 DEG C2Coarse pulp is then passed through a 100-mesh vibrating screen and aged for 72h to obtain Ca (OH)2Fine sizing; adding water to adjust the concentration to 8.3 wt%, and keeping the temperature at about 55 ℃;
unlike conventional methods, the present invention, before carbonization, Ca (OH)2The fine pulp is not cooled in a heat exchanger, but is directly added with water, the concentration is adjusted to 8-9 wt%, and the temperature is kept between 55 ℃ and 60 ℃;
(3) the addition of the corresponding Ca (OH) was continued21.2 wt.% (as CaCO) in the fine pulp3Calculated by dry mass) of sucrose and citric acid composite crystal form control agent, sucrose, Sr (OH)2And citric acid accounting for 60%, 20% and 20%, respectively, introducing carbon dioxide for carbonization reaction until pH of the reaction system is reduced to below 7.0 to obtain specific surface area of 15.5m2Per gram of nano calcium carbonate slurry 1;
in the step, the stirrer of the reactor is closed in the carbonation reaction process to intervene the development of the crystal, and the calcium hydroxide slurry is not stirred like the conventional preparation method, so that the finally obtained special nano calcium carbonate for the polyurethane sealant is in a partial cylindrical crystal form, and has more perfect and compact surface structure and product bulkiness than the common nano calcium carbonate product;
(4) conveying the nano calcium carbonate slurry 1 to an activation kettle, heating to 70 ℃, adding a composite modifier solution compounded by 3.2 wt% of sodium stearate, tributyl phosphate and polydimethylsiloxane for coating treatment, wherein the ratio of the sodium stearate, the tributyl phosphate and the polydimethylsiloxane is respectively 30%, 50% and 20%, and stirring for 45min to obtain modified nano calcium carbonate slurry 2; the reaction process of the composite modifier is as follows: adding raw material components into a reaction container for reaction, wherein the reaction conditions are as follows: the temperature is 85 ℃, the stirring speed is 450rpm, and the reaction time is 1.5 h;
(5) and adding clear water into the modified nano calcium carbonate slurry 2 according to the proportion of 1:3, mixing, stirring, dehydrating, drying in a chain manner, and when the water content of the semi-finished product is less than or equal to 0.26%, feeding the semi-finished product into a crushing section for packaging to obtain the nano calcium carbonate finished product special for the polyurethane sealant.
The water in the preparation process can be clean tap water.
Example 2
A preparation method of special nano calcium carbonate for polyurethane sealant comprises the following steps:
(1) calcining crushed limestone in a vertical kiln at 1100 ℃ to obtain CaO, wherein the content of magnesium hydroxide in the ore is less than or equal to 0.5 percent;
(2) CaO and water are reacted according to a ratio of 1:6 to obtain Ca (OH) with a concentration of 16 wt% and a temperature of 85 DEG C2The coarse pulp, then the generated calcium hydroxide coarse pulp passes through a 120-mesh vibrating screen in turn, and is aged for 48 hours to obtain calcium hydroxide fine pulp; the clear water is used for size mixing until the concentration is 8.4wt percent and the temperature is 54 ℃;
(3) adding corresponding Ca (OH)21.4 wt.% (as CaCO) in the fine pulp3Calculated by dry mass) of sucrose and phosphoric acid, sucrose, Sr (OH)2The ratio of the zinc sulfate to the zinc sulfate is 65 percent, 20 percent and 15 percent respectively, then kiln gas (carbon dioxide concentration is 40 percent) is introduced for carbonization reaction until the pH value of the reaction system is reduced to below 7.0, and the specific surface area is 15.7m2Per gram of nano calcium carbonate slurry 1;
(4) conveying the nano calcium carbonate slurry 1 to an activation kettle, heating to 70 ℃, adding a modifier solution compounded by 3.2 wt% of sodium stearate, sodium oleate and polydimethylsiloxane for coating treatment, wherein the sodium stearate, the sodium oleate and the polydimethylsiloxane respectively account for 50%, 30% and 20%, and stirring for 45min to obtain modified nano calcium carbonate slurry 2; the reaction process of the composite modifier is as follows: adding raw material components into a reaction container for reaction, wherein the reaction conditions are as follows: the temperature is 90 ℃, the stirring speed is 500rpm, and the reaction time is 2 h;
(5) adding clear water into the modified nano calcium carbonate slurry 2 according to the proportion of 1:2.5, mixing, stirring, dehydrating, drying in a chain manner, and when the water content of the semi-finished product is less than or equal to 0.26%, entering a crushing section for packaging to obtain the special nano calcium carbonate finished product for the polyurethane sealant.
Example 3
A preparation method of special nano calcium carbonate for polyurethane sealant comprises the following steps:
(1) calcining macadam in a vertical kiln at 1060 ℃ to obtain CaO, wherein the content of magnesium hydroxide in the macadam is less than or equal to 0.5%;
(2) CaO and water are reacted according to a ratio of 1:4.5 to obtain Ca (OH) with a concentration of 20 wt% and a temperature of 87 DEG C2Coarse pulp is then passed through a 90-mesh vibrating screen and aged for 60h to obtain Ca (OH)2Fine sizing; adding water to adjust the concentration to 8.6 wt%, and keeping the temperature at about 55 ℃;
(3) the addition of the corresponding Ca (OH) was continued21.5 wt.% (as CaCO) in the fine pulp3Calculated by dry mass) of sucrose and citric acid composite crystal form control agent, sucrose, Sr (OH)2And citric acid accounting for 45%, 30% and 25% respectively, introducing kiln gas (carbon dioxide concentration of 40%) to perform carbonization reaction until pH of the reaction system is reduced to below 7.0 to obtain specific surface area of 17.1m2Per gram of nano calcium carbonate slurry 1;
(4) conveying the nano calcium carbonate slurry 1 to an activation kettle, heating to 75 ℃, adding a composite modifier solution compounded by 3.4 wt% of sodium stearate, tributyl phosphate and polydimethylsiloxane for coating treatment, wherein the ratio of the sodium stearate, the tributyl phosphate and the polydimethylsiloxane is respectively 30%, 50% and 20%, and stirring for 45min to obtain a modified nano calcium carbonate slurry 2; the reaction process of the composite modifier is as follows: adding raw material components into a reaction container for reaction, wherein the reaction conditions are as follows: the temperature is 85 ℃, the stirring speed is 500rpm, and the reaction time is 1.5 h;
(5) adding clear water into the modified nano calcium carbonate slurry 2 according to the proportion of 1:3.5, mixing, stirring, dehydrating, drying in a chain manner, and when the water content of the semi-finished product is less than or equal to 0.26%, entering a crushing section for packaging to obtain the special nano calcium carbonate finished product for the polyurethane sealant.
Example 4
A polyurethane sealant comprises the following components: 350 parts of polyurethane prepolymer, 300 parts of DOP 260, 430 parts of nano calcium carbonate special for polyurethane sealant, 1.0-1.5 parts of triethylene diamine and 0.4-0.7 part of oxazolidine compound; the nano calcium carbonate special for the polyurethane sealant can be prepared by adopting the method in the embodiments 1-3.
Comparative example
(1) Calcining macadam in a vertical kiln at 1000 ℃ to obtain CaO, wherein the content of magnesium hydroxide in the macadam is less than or equal to 0.5%;
(2) reacting CaO with water in a ratio of 1:5 to obtain Ca (OH)2Coarse pulp, passing through 100 mesh vibrating screen, pumping the obtained pulp into intermediate tank, aging for more than 24 hr to obtain Ca (OH)2Refining, cooling to about 40 ℃ by air, cooling by a heat exchanger, mixing with clear water to obtain slurry, and reducing the concentration to 8.5 wt% and the temperature to 25 ℃;
(3) adding Ca (OH) to the reaction mixture2Sucrose accounting for 0.4 wt% of the dry mass of calcium carbonate in the seminal plasma, then introducing kiln gas (the concentration of carbon dioxide is 40%) to carry out carbonization reaction, and stirring at the speed of 200rpm until the pH value of the reaction system is reduced to below 7.0 to obtain the product with the specific surface area of 16.8m2Per gram of nano calcium carbonate slurry;
(4) conveying the nano calcium carbonate slurry to an activation kettle, heating to 70 ℃, adding 3.2 wt% of sodium stearate solution for coating treatment, and stirring for 45min to obtain modified nano calcium carbonate slurry;
(5) and dehydrating and drying the obtained modified nano calcium carbonate slurry in a chain manner, and when the moisture content of the semi-finished product is less than or equal to 0.26%, entering a crushing section for packaging to obtain the special finished product for the polyurethane sealant.
The polyurethane sealants further prepared from the special nano calcium carbonate for the polyurethane sealants prepared in the examples 1 to 3 and the comparative example are tested, and the results are shown in the table 1 and the attached drawings 1 to 2. Compared with the polyurethane sealant prepared from the common nano calcium carbonate, the nano calcium carbonate special for the polyurethane sealant has better surface finish and mechanical property, has good fluidity when applied to a polyurethane system, and greatly improves the long-term storage and processing performance. The nano calcium carbonate finally obtained by the method of the invention is in a partial cylindrical crystal form, and has more perfect and compact surface structure and product bulkiness than normal nano calcium carbonate products.
TABLE 1
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several changes and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. The preparation method of the special nano calcium carbonate for the polyurethane sealant is characterized by comprising the following steps:
(1) calcining the crushed limestone at the temperature of 1000 ℃ and 1100 ℃ in a vertical kiln to obtain CaO, wherein the content of magnesium hydroxide in the crushed limestone is less than or equal to 0.5 percent;
(2) slaking the CaO obtained in step (1) in water to obtain Ca (OH) with the concentration of 15-20 wt% and the temperature of 80-95 DEG C2Brown stock, then Ca (OH)2The brown stock is passed through a vibrating screen and aged to obtain Ca (OH)2Fine sizing; then adding water to add Ca (OH)2Adjusting the concentration of the seminal plasma to 8-9 wt% at 55-60 deg.C;
(3) ca (OH) at a concentration of 8 to 9 wt% in step (2)2Adding a composite crystal form control agent with the mass of 0.8-2 wt% of the dry basis of calcium carbonate into the fine pulp, and then introducing CO2The gas is subjected to carbonation reaction until the pH of the reaction system is reduced to below 7.0 to obtain the product with the specific surface area of 12-18m2Per gram of nano calcium carbonate slurry 1;
(4) adding a composite modifier consisting of fatty acid or fatty acid salt, aliphatic aldehyde, phosphate and inert silicone oil into a reaction container for reaction to obtain a composite modifier solution with the dry mass of 2.5-3.5 wt%;
then conveying the nano calcium carbonate slurry 1 to an activation kettle, heating to 70 ℃, adding the composite modifier solution for coating treatment, and stirring for 40-50min to obtain modified nano calcium carbonate slurry 2;
(5) adding water into the modified nano calcium carbonate slurry 2 according to the proportion of 1:2-4, mixing, stirring, dehydrating, drying, and packaging in a crushing section when the water content is less than or equal to 0.26% to obtain the special nano calcium carbonate for the polyurethane sealant.
2. The method for preparing the nano calcium carbonate special for the polyurethane sealant according to claim 1, wherein in the step (2), the mass ratio of CaO to water is 1:4-6, the initial temperature of the water is 45-50 ℃, and the stirring reaction is carried out for 5-15min to obtain Ca (OH) with the concentration of 15-20 wt% and the temperature of 80-95 ℃2And (4) coarse pulp.
3. The method for preparing the nano calcium carbonate specially used for the polyurethane sealant according to claim 1, wherein in the step (2), the vibrating screen is 80-120 meshes, and the aging time is 48-72 h.
4. The method for preparing the nano calcium carbonate specially used for the polyurethane sealant according to claim 1, wherein in the step (3), the composite crystal form control agent is one or a combination of more of Sr or Ba compound, organic acid, inorganic acid, monosaccharide or polysaccharide.
5. The preparation method of the nano calcium carbonate special for the polyurethane sealant according to claim 1, wherein in the step (4), the reaction conditions of the composite modifier are as follows: the temperature is 85-90 ℃, the stirring speed is 400-.
6. The method for preparing the nano calcium carbonate specially used for the polyurethane sealant according to the claim 1, wherein in the step (4), the aliphatic acid or the fatty acid salt has the total amount of carbon atoms from C4 to C24.
7. The method for preparing the nano calcium carbonate specially used for the polyurethane sealant according to claim 1, wherein in the step (4), the phosphate ester is a blend of a phosphate monoester and a phosphate diester.
8. The method for preparing the nano calcium carbonate specially used for the polyurethane sealant according to claim 1, wherein in the step (4), the aliphatic aldehyde is one or more of aliphatic aldehydes with 6 to 12 carbon atoms in any combination.
9. The method for preparing the nano calcium carbonate specially used for the polyurethane sealant according to claim 1, wherein in the step (4), the inert silicone oil is polydimethylsiloxane and a mixture thereof.
10. The application of the special nano calcium carbonate for the polyurethane sealant as claimed in any one of claims 1 to 9, which is used for preparing the polyurethane sealant, wherein the polyurethane sealant comprises the following components: 350 parts of polyurethane prepolymer, 300 parts of DOP 260, 430 parts of nano calcium carbonate special for polyurethane sealant, 1.0-1.5 parts of triethylene diamine and 0.4-0.7 part of oxazolidine compound.
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| CN114262527A (en) * | 2021-12-27 | 2022-04-01 | 连州市凯恩斯纳米材料有限公司 | Special nano calcium carbonate for silane modified polyether sealant and preparation method thereof |
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