CN113355014A - Polyurea coating material coated on fiber concrete wall and preparation method thereof - Google Patents
Polyurea coating material coated on fiber concrete wall and preparation method thereof Download PDFInfo
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- CN113355014A CN113355014A CN202110864611.0A CN202110864611A CN113355014A CN 113355014 A CN113355014 A CN 113355014A CN 202110864611 A CN202110864611 A CN 202110864611A CN 113355014 A CN113355014 A CN 113355014A
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- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/02—Polyureas
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/50—Polyethers having heteroatoms other than oxygen
- C08G18/5021—Polyethers having heteroatoms other than oxygen having nitrogen
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Abstract
The invention provides a novel polyurea elastomer capable of being well adhered to the surface of a fiber concrete wall and a preparation method thereof, and the component A is prepared by reacting 45-60 parts by mass of isocyanate and 40-55 parts by mass of polyether polyol through processes of heating, vacuum dehydration and the like; the component B is prepared by stirring, mixing and vacuum dehydrating 55-65 parts by mass of amino-terminated polyether, 26-35 parts by mass of liquid amine chain extender and 6-10 parts by mass of auxiliary agent. The polyurea coating synthesized by the invention has high strength, good toughness, good impact resistance and strong bonding force with a concrete substrate; the damage of concrete can be greatly reduced, and the anti-explosion capability of the concrete is improved; meanwhile, the waterproof performance of the concrete is improved, and the concrete has wide application space on civil and military engineering protection facilities.
Description
Technical Field
The invention belongs to the field of preparation of functional coating materials, and particularly relates to a novel polyurea elastomer which is suitable for coating a fiber concrete wall.
Background
In life, the damage of buildings is often damaged by dynamic loads, such as explosion events, earthquakes and the like; although these loads are applied for a short time, the impact force on the building is large, the wall of the building is weak, and sudden damage of the wall can cause casualties and property loss. In order to reduce the damage of the wall and ensure the integrity of the wall under the impact explosion, domestic and foreign scholars develop a series of researches on the structural antiknock and impact resistance. The wall body can be reinforced by reinforcing ribs and increasing the wall thickness, so that the anti-explosion and anti-impact performance of the wall body is improved, and the steel plate or the sandwich plate can also be used for reinforcement, so that certain protection performance can be improved, but the protection performance of the wall body cannot be improved fundamentally. When the wall is damaged, fragments can still splash, the self weight of the wall is increased, and the economic cost is greatly increased. Therefore, the development of a novel protective structural material with strong protection capability under the action of explosive impact load is urgently needed.
Compared with the traditional concrete, the fiber concrete has remarkable advantages, delays the expansion of micro cracks and the formation of macro cracks in the concrete, remarkably improves the tensile, bending, impact and fatigue resistance of the concrete, and has better ductility. However, the fiber concrete still generates a large amount of fragments to splash under the action of the explosive impact load, so that serious secondary damage is caused, and the protection of the wall under the action of the explosive impact load cannot be solved. With the development of material preparation technology, a new polymer material, namely polyurea elastomer, appears in the field of disaster prevention and reduction recently, and the polyurea coating has high strength, good toughness, good impact resistance and strong bonding force with a concrete substrate; the concrete explosion-proof device can greatly reduce the damage of concrete, increase the anti-explosion capability of the concrete, reduce fragments generated by explosion and weaken the harm of fragment splashing to a human body.
According to the application requirements, the polyurea elastomer which is researched and developed and coated on the fiber concrete can make up the defects of the application of a concrete wall body in the field of explosion impact protection, can exert the inherent advantages of the polyurea material, improves the waterproofness of the concrete, and has wide application space on military and civil engineering protection facilities. There is a great need to develop polyurea elastomers specifically coated on fiber concrete.
Disclosure of Invention
Aiming at the shortage of novel polyurea elastomer coating products applied to coating on fiber concrete walls and wide application prospect thereof, the invention discloses a novel polyurea elastomer for coating on fiber concrete walls and a preparation method thereof.
In order to achieve the above effects, the present invention adopts the following embodiments:
a novel polyurea elastomer coating for coating a fiber concrete wall is a two-component coating material which is formed by spraying a curing agent consisting of an A component isocyanate semi-prepolymer, a B component amino-terminated polyether, an amine chain extender and a functional auxiliary agent through a high-temperature high-pressure collision atomization mixing process. Wherein the component A is prepared by reacting 45-60 parts by mass of isocyanate and 40-55 parts by mass of polyether polyol through processes of heating, vacuum dehydration and the like; the component B is prepared by stirring, mixing and vacuum dehydrating 55-65 parts by mass of amino-terminated polyether, 26-35 parts by mass of amine chain extender and 6-10 parts by mass of auxiliary agent.
Further verification is preferably carried out, the-NCO content of the component A isocyanate semi-prepolymer is 14-17.5%, and the isocyanate semi-prepolymer is mainly obtained by reacting excessive aromatic diisocyanate and polyether polyol.
Further verification is that preferably, the aromatic diisocyanate is one or a combination of several of dimethyldiphenylmethane diisocyanate, methylcyclohexyl diisocyanate, a mixture of 4,4 '-diphenylmethane diisocyanate and 2, 4' -diphenylmethane diisocyanate, and diphenylmethane diisocyanate
Further verification is that the polyether polyol is one or a combination of several of polypropylene oxide glycol, trihydroxy polypropylene oxide ether, polytetrahydrofuran ether glycol and propylene oxide tetrol.
Further verification is that preferably, the amino-terminated polyether in the component B is a combination of D-2000 and T-5000 in Jeffamine series of Huntsman company, and the recommended dosage ratio of the D-2000 to the T-5000 is 8-12: 1.
Further verification is that preferably, the amine chain extender in the component B is preferably a combination of 3, 5-diethyltoluenediamine and 4, 4-bis-sec-butylaminodiphenylmethane, and the preferred dosage ratio is 2.5-0.8: 1.
Further verification is that preferably, the functional auxiliary agents in the component B are leveling agents, defoaming agents, dispersing agents, coupling agents and antioxidants.
Further, the verification is that the leveling agent is BYK-354 of BYK chemical company, and preferably 0.6-1.5 parts by mass.
Further verification shows that the defoaming agent is a high-efficiency organic silicon defoaming agent BYK-066N, and preferably 0.6-1.5 parts by mass.
Further verification shows that BYK-164 is preferably used as the wetting dispersant, and 0.8-1.5 parts by mass is preferably used.
Further verification is that the coupling agent is gamma-aminopropyltriethoxysilane KH-550, preferably 0.8-1.5 parts by mass.
Further verification is that the antioxidant is preferably 3, 5-di-tert-butyl-4-hydroxy-iso-octyl phenylpropionate, and preferably 0.8-1.5 parts by mass.
Further verification is that the polyurea coating material has an isocyanate index of 0.9-1.1, the viscosity of the component A and the viscosity of the component B are kept below 600mPa & s at room temperature, and the polyurea coating material is prepared by mixing and spraying according to the volume ratio of 1: 1.
The invention also provides a preparation method of the anti-knock impact-resistant polyurea coating material applied to foamed aluminum, which comprises the following key steps:
(1) and operating a high-temperature circulating pump to dry the reaction site, and connecting a water circulation vacuum pump to form a vacuum environment in the glass reaction kettle (so that the temperature in the kettle reaches 100-120 ℃ and the vacuum degree is less than or equal to 0.095 MPa). Adding weighed polyether polyol into a dry glass reaction kettle, performing reduced pressure dehydration for 3-5 h, and stopping dehydration when the water content is less than or equal to 0.05%. Secondly, adding the polyether polyol dehydrated in vacuum into a constant-pressure funnel/hanging bottle, and forming a nitrogen protection environment in the kettle body by utilizing a vacuum pump and a nitrogen device to reciprocate three times. Finally, adjusting the temperature in the kettle to about 60 ℃, beginning to drip polyether polyol, finishing dripping the polyether polyol when the temperature is raised to 80 ℃, stirring for reaction for 2 hours, and discharging to obtain a component A of the isocyanate semi-prepolymer;
(2) firstly, the amino-terminated polyether, the liquid amine chain extender and the auxiliary agent are sequentially added into a charging basket, and stirred by a high-speed dispersion machine at the revolution of 500r/min, so that the raw materials are uniformly mixed. Secondly, placing the uniformly mixed raw materials into a double-layer glass reaction kettle, performing reduced pressure dehydration for 3-5 hours, detecting the water content of the raw materials, discharging the raw materials when the water content is less than or equal to 0.005, and filtering and packaging the raw materials to obtain a curing agent B component;
(3) and (3) loading the prepared component A and component B into a high-temperature high-pressure spraying machine selected from Jinghuapaike, setting the temperature to be 55-75 ℃ and the spraying flow rate to be 2200-2500 kg/min, and spraying the components on the fiber concrete wall surface according to the volume ratio of 1:1 to obtain the novel polyurea elastomer coating for the fiber concrete wall body.
The novel polyurea elastomer coating for coating the fiber concrete wall has the advantages that: the optimal novel polyurea elastomer coated with the fiber concrete is obtained by adjusting the proportion of different contents of the polyurea coating. The shock resistance of the polyurea is increased, the binding force of the polyurea coating and the concrete substrate surface is improved, and the anti-explosion performance of the substrate can be greatly increased. Meanwhile, the polyurea coating synthesized by the invention has the characteristics of high strength, good toughness, good waterproof performance and the like, and can be coated on a fiber concrete wall structure to form a novel explosion-proof building structure; has important application value in the protection facilities of the civil and military engineering.
Detailed Description
The technical solutions of the present invention will be described below with reference to specific embodiments so as to better understand the application of the present invention.
Example 1
The embodiment provides a novel polyurea elastomer coating for coating on a fiber concrete wall, and the preparation raw materials and the mixture ratio are as follows: the component A comprises, by mass, isocyanate MDI-5048 parts and polyether polyol 52 parts; the component B comprises, by mass, amino-terminated polyether Jeffamine D-200060 parts, amino-terminated polyether Jeffamine T-50005 parts, Wanhua 3, 5-diethyltoluenediamine E10022 parts, Wanhua 4, 4' -di-sec-butyl aminodiphenylmethane W62009.3 parts, a leveling agent BYK-3541 parts, a defoaming agent BYK-066N 0.5 part, a wetting dispersant BYK-1641 part, a Dow Corning coupling agent KH-5500.5 parts, a Pasteur antioxidant 11350.5 part and a sky blue color paste 0.2 part.
The polyurea coating material used in this example was prepared as follows:
(1) adding polyoxypropylene glycol PPG-2000 in parts by mass into a reaction kettle, carrying out reduced pressure dehydration for 2.5 hours at the temperature of 100 ℃ until the water content is less than or equal to 0.05%, then cooling to 60 ℃, adding isocyanate MDI-50, heating to 80 ℃, reacting for 1-2 hours, cooling to 40 ℃ after the reaction is finished, discharging, and detecting that the-NCO content in the semi-prepolymer reaches 15.5%, thus obtaining the component A of the isocyanate semi-prepolymer, and storing the component A in a nitrogen-filled protected closed container;
(2) sequentially adding amine chain extenders E100 and W6200, amino-terminated polyether D-2000 and T-5000 and a functional auxiliary agent into a closed reaction kettle in parts by mass, uniformly stirring for 1h, performing reduced pressure dehydration at the temperature of 100 ℃ for 2h, and determining that the water content is less than or equal to 0.05% by using a Karl Fischer method; filtering and packaging to obtain a curing agent B component;
(3) and then filling the prepared component A and component B into a charging barrel of a JHPK-DD3 type high-temperature high-pressure spraying machine, setting the temperature at 70 ℃ and the spraying flow rate at 2300kg/min, and spraying the mixture on the surface of the fiber concrete according to the volume ratio of 1:1 to prepare the protective polyurea elastomer coating material for the fiber concrete wall surface.
Example 2
The embodiment provides a novel polyurea elastomer coating for coating on a fiber concrete wall, and the preparation raw materials and the mixture ratio are as follows: the component A comprises, by mass, Wanhua isocyanate MDI-5052 parts and polytetrahydrofuran ether glycol 48 parts; the component B comprises, by mass, amino-terminated polyether Jeffamine D-200062 parts, amino-terminated polyether Jeffamine T-50004 parts, Wanhua 3, 5-diethyltoluenediamine E10022 parts, Wanhua 4, 4' -di-sec-butyl aminodiphenylmethane W62007.3 parts, a leveling agent BYK-3541 parts, a defoaming agent BYK-066N 0.5 part, a wetting dispersant BYK-1641 part, a Dow Corning coupling agent KH-5500.5 parts, a Pasteur antioxidant 11350.5 parts, and a sky blue color paste 0.2 part.
The polyurea coating material used in this example was prepared as follows:
(1) adding polytetrahydrofuran ether glycol into a reaction kettle according to the mass parts, carrying out reduced pressure dehydration for 2.5 hours at the temperature of 100 ℃ until the water content is less than or equal to 0.05%, then cooling to 60 ℃, adding isocyanate, heating to 80 ℃, reacting for 2-3 hours, cooling to 40 ℃ after the reaction is finished, discharging, and detecting that the-NCO content in the semi-prepolymer reaches 15.5%, thus obtaining the component A of the isocyanate semi-prepolymer, and storing the component A in a nitrogen-filled sealed container;
(2) sequentially adding amine chain extenders E100 and W6200, amino-terminated polyether D-2000 and T-5000 and a functional auxiliary agent into a closed reaction kettle in parts by mass, uniformly stirring for 1h, performing reduced pressure dehydration at the temperature of 100 ℃ for 2h, determining that the water content is less than or equal to 0.05% by using a Karl Fischer method, filtering and packaging to obtain a curing agent B component;
(3) and then filling the prepared component A and component B into a charging barrel of a JHPK-DD3 type high-temperature high-pressure spraying machine, setting the temperature at 70 ℃ and the spraying flow rate at 2300kg/min, and spraying the mixture on the surface of the fiber concrete according to the volume ratio of 1:1 to prepare the protective polyurea elastomer coating material for the fiber concrete wall surface.
Example 3
The embodiment provides a novel polyurea elastomer material for coating on a fiber concrete wall, and the preparation raw materials and the mixture ratio are as follows: the component A comprises, by mass, Wanhua isocyanate MDI-5055 parts and polypropylene oxide glycol 45 parts; the component B comprises, by mass, amino-terminated polyether Jeffamine D-200051, amino-terminated polyether Jeffamine T-50007, Wanhua 3, 5-diethyltoluenediamine E10017.3, Wanhua 4, 4' -di-sec-butyl aminodiphenylmethane W620020, a leveling agent BYK-3541, a defoaming agent BYK-066N 0.5, a wetting dispersant BYK-1641, a Dow Corning coupling agent KH-5500.5, a Pasteur antioxidant 11350.5 and a sky blue color paste 0.2.
The polyurea coating material used in this example was prepared as follows:
(1) adding polypropylene oxide glycol into a reaction kettle according to the mass portion, carrying out reduced pressure dehydration for 2.5 hours at the temperature of 100 ℃ until the water content is less than or equal to 0.05 percent, then cooling to 60 ℃, adding isocyanate, heating to 80 ℃, reacting for 2-3 hours, cooling to 40 ℃ after the reaction is finished, discharging, and detecting the-NCO content in the semi-prepolymer to reach 15.5 percent to obtain the component A of the isocyanate semi-prepolymer, and storing in a nitrogen-filled protective closed container;
(2) sequentially adding amine chain extenders E100 and W6200, amino-terminated polyether D-2000 and T-5000 and a functional auxiliary agent into a closed reaction kettle in parts by mass, uniformly stirring for 1h, performing reduced pressure dehydration at the temperature of 100 ℃ for 2h, determining that the water content is less than or equal to 0.05% by using a Karl Fischer method, filtering and packaging to obtain a curing agent B component;
(3) and then filling the prepared component A and component B into a charging barrel of a JHPK-DD3 type high-temperature high-pressure spraying machine, setting the temperature at 70 ℃ and the spraying flow rate at 2300kg/min, and spraying the mixture on the surface of the fiber concrete according to the volume ratio of 1:1 to prepare the protective polyurea elastomer coating material for the fiber concrete wall surface.
The embodiment is used for preparing a protective polyurea elastomer coating material for a fiber concrete wall surface. The main performance indicators are shown in the following table:
the performance indexes in the table show that the polyurea coating material synthesized by the invention not only has excellent mechanical properties, but also has high strength, good toughness, good impact resistance and strong bonding force with a fiber concrete base material, thereby achieving the expected purpose of the invention.
It should be noted that the above embodiments are only for illustrating the specific embodiments of the present invention, but the present invention is not limited to the above embodiments. For the man skilled in the art, simple modifications and variations can be made within the concept and principle of the invention without departing from the scope of the claims described in the present application.
Claims (11)
1. The novel polyurea elastomer coated on a fiber concrete wall is characterized in that a raw material comprises a component A and a component B, wherein the component A is an isocyanate semi-prepolymer generated by the reaction of isocyanate and polyether polyol, wherein the proportion of the isocyanate is 45-60 parts by mass, and the proportion of the polyether polyol is 40-55 parts by mass; the component B is a curing agent consisting of amino-terminated polyether, an aromatic amine chain extender and an auxiliary agent, wherein the amino-terminated polyether accounts for 55-65 parts by mass, the amine chain extender accounts for 26-35 parts by mass, and the auxiliary agent accounts for 6-10 parts by mass.
2. The novel polyurea elastomer for coating a fiber concrete wall according to claim 1, wherein the-NCO content of the isocyanate semi-prepolymer in the component A is 14-17.5%; the isocyanate in the component A is mainly aromatic diisocyanate, preferably one or more of dimethyl diphenylmethane diisocyanate, methylcyclohexyl diisocyanate, a mixture of 4,4 '-diphenylmethane diisocyanate and 2, 4' -diphenylmethane diisocyanate, and diphenylmethane diisocyanate.
3. The polyurea elastomer as claimed in claim 1, wherein the polyether polyol in the A component is selected from one or more of polypropylene oxide glycol, trihydroxy polypropylene oxide ether, polytetrahydrofuran ether glycol, and propylene oxide tetrol.
4. The novel polyurea elastomer for coating on a fiber concrete wall as claimed in claim 1, wherein the amino-terminated polyether in the component B is preferably selected from a combination of D-2000 and T-5000 in Jeffamine series of Huntsman corporation, preferably in an amount ratio of 8-12: 1; the amine chain extender in the component B is preferably a combination of 3, 5-diethyltoluenediamine and 4, 4' -bis-sec-butylaminodiphenylmethane, and the preferable dosage ratio is 2.5-0.8: 1.
5. The novel polyurea elastomer for coating on a fiber concrete wall as claimed in claim 1, wherein the leveling agent in the B-component auxiliary agent is preferably one selected from BYK-354, BYK-359 and BYK-350 of BYK chemical company, and the mass ratio of the leveling agent is 0.6-1.5%.
6. The novel polyurea elastomer for coating on a fiber concrete wall as claimed in claim 1, wherein the defoamer in the B-component auxiliary is preferably one selected from BYK-066 and BYK-070 of BYK chemical company, and the mass ratio of the defoamer is 0.6-1.5%.
7. The novel polyurea elastomer for coating on fiber concrete walls according to claim 1, wherein the dispersant, the coupling agent and the antioxidant in the B-component auxiliary agent; preferably, the wetting dispersant is preferably BYK-164, and the mass ratio of the wetting dispersant is 0.8-1.5%; the coupling agent is preferably gamma-aminopropyl triethoxysilane KH-550, and the mass ratio is 0.8-1.5%; the antioxidant is preferably selected from 3, 5-di-tert-butyl-4-hydroxy-iso-octyl phenylpropionate, and the mass percentage is 0.8-1.5%.
8. The novel polyurea elastomer for coating on a fiber concrete wall according to claim 1, wherein the isocyanate index of the synthetic polyurea elastomer is preferably 0.9-1.1, the viscosity of the component A and the component B is controlled below 600mPa s at room temperature, and the components are mixed and sprayed according to the volume ratio of 1: 1.
9. The novel polyurea elastomer for coating on fiber concrete walls according to claims 1 to 8, wherein the preparation method of the A component is as follows: and operating a high-temperature circulating pump to dry the reaction site, and connecting a water circulation vacuum pump to form a vacuum environment in the glass reaction kettle (so that the temperature in the kettle reaches 100-120 ℃ and the vacuum degree is less than or equal to 0.095 MPa). Adding weighed polyether polyol into a dry glass reaction kettle, performing reduced pressure dehydration for 3-5 h, and stopping dehydration when the water content is less than or equal to 0.05%. Secondly, adding the polyether polyol dehydrated in vacuum into a constant-pressure funnel/hanging bottle, and forming a nitrogen protection environment in the kettle body by utilizing a vacuum pump and a nitrogen device to reciprocate three times. And finally, adjusting the temperature in the kettle to about 60 ℃, beginning dripping polyether polyol, heating to 80 ℃, just finishing dripping the polyether polyol, stirring for reaction for 2 hours, and discharging to obtain the component A.
10. The novel polyurea elastomer for coating on fiber concrete walls according to claims 1 to 8, wherein the component B is prepared by the following method: firstly, the amino-terminated polyether, the liquid amine chain extender and the auxiliary agent are sequentially added into a charging basket, and stirred by a high-speed dispersion machine at the revolution of 500r/min, so that the raw materials are uniformly mixed. And secondly, placing the uniformly mixed raw materials into a double-layer glass reaction kettle, performing reduced pressure dehydration for 3-5 hours, detecting the water content of the raw materials, and discharging to obtain a component B when the water content is less than or equal to 0.005.
11. The novel polyurea elastomer for coating on fiber concrete walls according to claims 1 to 10, wherein the spraying method of the polyurea elastomer is as follows: and (3) loading the prepared component A and component B into a high-temperature high-pressure spraying machine selected from Jinghuapaike, setting the temperature to be 55-75 ℃ and the spraying flow rate to be 2200-2500 kg/min, and spraying the components on the fiber concrete wall surface according to the volume ratio of 1:1 to obtain the novel polyurea elastomer coating for the fiber concrete wall body.
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