CN109554101B - Polyurethane waterproof coating - Google Patents
Polyurethane waterproof coating Download PDFInfo
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- CN109554101B CN109554101B CN201811356409.1A CN201811356409A CN109554101B CN 109554101 B CN109554101 B CN 109554101B CN 201811356409 A CN201811356409 A CN 201811356409A CN 109554101 B CN109554101 B CN 109554101B
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
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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
- C08G18/4804—Two or more polyethers of different physical or chemical nature
- C08G18/4812—Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups
Abstract
The invention discloses a polyurethane waterproof coating, which comprises a component A and a component B; the component A comprises: isocyanate, hydroxyl-terminated polyether diol with molecular weight of 2000-5000-; the component B comprises: hydroxyl-terminated polyether polyol, a plasticizer, an organic solvent, a pigment filler, a catalyst, a curing agent, a high-performance assistant and an acidic assistant. The polyurethane waterproof material has the advantages of high tensile strength, high elongation at break, high right-angle tear strength, high bonding strength, resistance to damp-heat aging, resistance to chemical corrosion, low cost and the like, is compact in membrane, high in brightness and reliable in construction, has all performances higher than the standard TB/T2965 plus 2011 technical conditions for waterproof layers of railway concrete bridges, and is particularly suitable for application in railway bridges.
Description
Technical Field
The invention belongs to the field of building waterproof coatings, and particularly relates to a polyurethane waterproof coating.
Background
The polyurethane waterproof paint is a waterproof material which is made of polyurethane resin as a main material and is used for field construction. Developed for overcoming the defects of the traditional asphalt waterproof coating and waterproof coiled material. The coating belongs to a chemical reaction type waterproof coating, is a rubber-like high-elasticity coating film after being cured, is seamless as a whole, has strong adaptability to the deformation of the elasticity of a base layer crack, and is convenient to construct and maintain. The polyurethane waterproof coating is an amorphous viscous liquid substance before curing, can be constructed on the surface layer of any complex base layer, is called as a liquid coiled material in the industry due to the excellent comprehensive performance, and is widely applied in the world. The polyurethane waterproof coating in China has been developed for more than 20 years, is rich in product types and excellent in performance, and occupies an important position in the building waterproof industry.
In the early coal tar type high-strength polyurethane waterproof coating product for the railway, because coal tar contains a large amount of volatile harmful substances such as anthracene, naphthalene, phenols and the like, the coal tar has strong pungent smell and high toxicity, seriously pollutes the environment and harms human health, and the coal tar type polyurethane waterproof coating is forbidden to be used in succession in areas such as Beijing, Shanghai, Shenzhen and the like. Most manufacturers of high-strength polyurethane waterproof coatings for railways in the current market still adopt aromatic oil as a filling material, the odor and the toxicity of the high-strength polyurethane waterproof coatings are reduced by a lot compared with coal tar polyurethane waterproof coatings, but the aromatic oil is a byproduct of petroleum refining, the source of the aromatic oil is unstable, the components of the aromatic oil are complex, a large amount of polycyclic aromatic hydrocarbons (also called polycyclic aromatic hydrocarbons) are contained, such as typical polycyclic aromatic hydrocarbon benzopyrene (Ba P), and the toxicity and the ecological toxicity of the aromatic oil are proved to have carcinogenicity, mutagenicity and toxicity to reproductive systems. Aromatic oil is added into the polyurethane waterproof coating, and the polycyclic aromatic hydrocarbon inevitably diffuses into the environment and contacts with human beings, so that the environment and the human health are harmed. Therefore, people pay more and more attention to the development of high-performance and environment-friendly high-strength polyurethane waterproof paint for railways.
The bi-component polyurethane waterproof coating has excellent performance, wide raw materials and high cost, and is a high-quality product in the market of waterproof coatings. The common components of the general polyether polyurethane waterproof coating are as follows: the component A is an isocyanate-terminated prepolymer prepared by blending two or three of Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI) and 1, 6-Hexamethylene Diisocyanate (HDI) and polyether polyol serving as raw materials through a hydrogen transfer addition polymerization reaction under the conditions of heating and stirring; the component B is a mixture prepared by adding a proper amount of filler, chain extender, auxiliary agent and the like into an amine or hydroxyl curing agent. A. The component B can be uniformly mixed according to a certain mass ratio to form high-strength polyurethane waterproof paint for railways with different colors, and has excellent alkali resistance, heat resistance and aging resistance.
The following three schemes are mostly adopted for the composition of the common high-strength polyurethane waterproof coating in the market. The first is that the component A adopts toluene diisocyanate to react with polyether polyol to form isocyanate terminated prepolymer, and the component B adopts polyether, plasticizer and curing agent 3,3 '-dichloro-4, 4' -diaminodiphenylmethane (MOCA) and powder blending. The construction adopts A, B components to be blended and reacted to form the film. The TDI with higher reactivity can react with MOCA at lower temperature, thereby shortening the surface drying time of the membrane and reducing the construction waiting time. The second one is that the component A is prepared by blending toluene diisocyanate and diphenylmethane diisocyanate according to a certain proportion and then reacting with polyether polyol to form isocyanate-terminated prepolymer, and the component B is prepared by blending polyether, plasticizer, curing agent 3,3 '-dichloro-4, 4' -diaminodiphenylmethane and powder. The construction adopts A, B components to be blended and reacted to form the film. The third is that the component A adopts diphenylmethane diisocyanate to react with polyether polyol to form isocyanate-terminated prepolymer, and the component B adopts polyether, plasticizer and curing agent 3,3 '-dichloro-4, 4' -diaminodiphenylmethane and powder blending. The construction adopts A, B components to be blended and reacted to form the film. Because MDI has a better linear structure, the viscosity of the produced prepolymer is lower than that of the prepolymer prepared by TDI, and the mixing, stirring and construction of AB components are facilitated.
The Chinese patent application CN104673076 discloses a novel high-strength polyurethane waterproof coating which is composed of A, B two components, wherein the component A is prepared from the following components in percentage by weight: 140-350 parts of polyether polyol, 20-60 parts of toluene diisocyanate, 20-60 parts of diphenylmethane diisocyanate and 50-100 parts of plasticizer; the component B is prepared from the following components in parts by weight: 50-100 parts of polyether polyol, 40-200 parts of plasticizer, 20-80 parts of chain extender, 0.1-0.5 part of polymerization inhibitor and 0.1-1 part of high-performance auxiliary agent defoaming agent. The prepared high-strength polyurethane waterproof coating has longer construction operation time, excellent physical and mechanical properties such as high strength, high elongation, high bonding strength and the like, and low content of free TDI, and is widely applied to infrastructure construction and municipal traffic engineering, in particular to waterproofing of important engineering such as high-speed railways, highway bridges and the like. Chinese patent application CN105273601 provides a high-strength polyurethane waterproof coating with A, B components in a mass ratio of 1:1, wherein the component A comprises 20-40% of diphenylmethane diisocyanate, 50-70% of polyether polyol, 30-45% of plasticizer and 0.05-2% of defoaming agent; the component B comprises 30-45% of plasticizer, 20-25% of chain extender, 30-50% of filler and the balance of solvent. The invention has greatly improved tensile strength, elongation and the like, even reaches the physical performance index of the spray polyurea waterproof coating, has excellent product performance, and is widely used in the aspects of urban subways, high-speed railways and the like. Chinese patent application CN108300252 discloses a high-strength polyurethane waterproof coating special for a double-component high-speed rail, wherein a component A is an isocyanate end-capping prepolymer obtained by polycondensation of polyether polyol and isocyanate in the presence of tartaric acid, a component B is a liquid composed of polyether polyol, a plasticizer, a reinforcing agent and a coagulant, the component A and the component B are mixed according to a certain proportion and coated on a waterproof base layer, and the waterproof coating is formed by normal-temperature crosslinking and curing.
However, the high-strength polyurethane waterproof coating for railways produced by the existing formula has right-angle tear strength which cannot meet the national standard due to the replacement of a new type of right-angle cutter by the railway building institute of the Chinese railway science research institute, and a new formula system must be adopted.
Disclosure of Invention
The invention aims to solve the problems, develop a two-component polyurethane waterproof coating which has high strength, high elongation at break and high bonding strength, compact coating film, reliable construction, excellent physical properties and acid and alkali resistance, and can meet the railway use standard.
In order to achieve the above object, the present invention provides a polyurethane waterproof coating material comprising a component a and a component B:
the component A comprises:
20-40 parts of isocyanate, 10-40 parts of hydroxyl-terminated polyether glycol with molecular weight of 2000-5000-;
the component B comprises:
5-20 parts of hydroxyl-terminated polyether polyol, 10-40 parts of plasticizer, 2-8 parts of organic solvent, 45-70 parts of pigment and filler, 0.02-0.05 part of catalyst, 5-25 parts of curing agent, 0.3-0.45 part of high-performance assistant and 0.05-0.4 part of acid assistant;
the high-performance auxiliary agent is at least one selected from defoaming agent, leveling agent, anti-settling agent, coupling agent, antioxidant, retarder and dispersing agent.
In a preferred embodiment of the present invention, in the polyurethane waterproofing paint,
the component A comprises:
26-31 parts of isocyanate, 15-35 parts of hydroxyl-terminated polyether glycol with molecular weight of 2000-5000-;
the component B comprises:
10-17 parts of hydroxyl-terminated polyether polyol, 12-28 parts of plasticizer, 2.5-6 parts of organic solvent, 50-60 parts of pigment and filler, 0.03-0.04 part of catalyst, 10-15 parts of curing agent, 0.1-0.9 part of high-performance assistant and 0.07-0.35 part of acid assistant.
In a preferred embodiment of the present invention, the isocyanate is toluene diisocyanate and/or diphenylmethane diisocyanate.
As a preferred embodiment of the present invention, the hydroxyl-terminated polyether polyol is selected from at least one of PPG-type polyether polyol and POP-type polyether polyol; the PPG polyether polyol and the POP polyether polyol are respectively selected from at least one of polyether diol and polyether triol.
As a preferred embodiment of the present invention, the hydroxyl-terminated polyether polyol has a molecular weight of 500-5000 and a hydroxyl value of 40-400mg KOH/g.
As a preferred embodiment of the present invention, the acidic adjuvant is selected from at least one of isooctanoic acid, n-octanoic acid, n-heptanoic acid, isoheptanoic acid, n-decanoic acid, and oleic acid, which are capable of accelerating the vulcanization rate; the crystal structure is improved, and the formation of crystal nuclei is promoted; the self-polymerization reaction and the crosslinking reaction of isocyanate are reduced, the polyurethane polymer with a complete structure is favorably formed, and the physical performance of the waterproof coating film is enhanced; has certain synergistic effect with the catalyst, and can adjust the curing rate of the product to ensure that the coating film has good performance. In addition, the acid auxiliary agent also has the advantages of low cost, small addition amount and obvious effect.
In a preferred embodiment of the present invention, the silane coupling agent is at least one selected from the group consisting of KH550, KH560, KH570, KH792, DL602, and DL 171.
In a preferred embodiment of the present invention, the catalyst is an organometallic catalyst and/or a tertiary amine catalyst.
The organic metal catalyst is preferably at least one selected from the group consisting of dibutyltin dilaurate, zinc bismuth complex catalysts, stannous octoate, bismuth isooctanoate, organic zinc and novel zinc decanoate.
The tertiary amine catalyst is preferably at least one selected from aliphatic tertiary amines, alicyclic tertiary amines, aromatic tertiary amines, alcoholic tertiary amines, and ammonium salt compounds thereof.
As a preferred embodiment of the present invention, the organic solvent is at least one selected from the group consisting of toluene, xylene, 120# mineral spirit, 150# mineral spirit, ethyl acetate and butyl acetate.
As a preferred embodiment of the invention, the pigment and filler is at least one selected from carbon black, titanium dioxide, indigo, iron yellow, iron oxide brown, kaolin, cement, heavy calcium carbonate, barium sulfate, magnesium oxide, calcium oxide, wollastonite, silicon micropowder and talcum powder.
In a preferred embodiment of the present invention, the plasticizer is at least one selected from the group consisting of dioctyl phthalate, dibutyl phthalate, diisononyl phthalate, chlorinated paraffin, and citrate plasticizers. The plasticizer used in the method has good compatibility with polyurethane, basically no migration or little migration, and remarkable stability and cooperativity.
In a preferred embodiment of the present invention, the curing agent is at least one selected from the group consisting of ethylene glycol, 1, 4-butanediol, 1, 2-propanediol, trimethylolpropane, glycerol, triethanolamine, diethanolamine, MOCA, DMTDA, isobutyl 3, 5-diamino-4-chlorobenzoate, and toluenediamine.
According to the invention, the tensile strength of the polyurethane waterproof coating is more than or equal to 11MPa, the elongation at break is more than 680 percent, the right-angle tear is more than or equal to 40N/mm, and the bonding strength is more than or equal to 2.9 MPa.
According to the polyurethane waterproof coating material of the invention,
the preparation method of the component A comprises the following steps:
step 1-1: mixing hydroxyl-terminated polyether glycol with molecular weight of 2000-5000-;
step 1-2: cooling to a second temperature, adding isocyanate under a high-speed stirring state to perform a first reaction, and then keeping or heating to a third temperature to perform a second reaction;
step 1-3: cooling to a second temperature, and adding a silane coupling agent under a high-speed stirring state;
step 1-4: keeping or cooling to a fourth temperature, and degassing under a vacuum condition to obtain the component A;
the preparation method of the component B comprises the following steps:
step 2-1: mixing hydroxyl-terminated polyether polyol, a plasticizer and a high-performance auxiliary agent, stirring and heating to a first temperature, adding a pigment filler and a curing agent, and dehydrating under a vacuum condition;
step 2-2: cooling to a second temperature, adding the organic solvent, the catalyst and the acidic auxiliary agent under the high-speed stirring state, and continuing stirring;
step 3-3: keeping or reducing the temperature to a fourth temperature, and degassing under a vacuum condition to obtain the component B.
In a preferred embodiment of the present invention, in the above preparation method, the vacuum condition is-0.1 MPa to-0.05 MPa, the dehydration time is 2 to 3 hours, and the degassing time is 20 to 40 min.
In a preferred embodiment of the present invention, the time for the first reaction is 1 to 2 hours, and the time for the second reaction is 3 to 4 hours.
In a preferred embodiment of the present invention, the first temperature is 100 to 120 ℃, the second temperature is 50 to 70 ℃, the third temperature is 70 to 100 ℃, and the fourth temperature is 40 to 50 ℃.
As a preferred embodiment of the present invention, the rotation speed of the high-speed stirring is 400-800 rpm.
The technical scheme of the invention has the following beneficial effects:
1. the A, B component adopts environment-friendly plasticizer and solvent, which can meet the national environmental protection requirement; the low molecular weight polyether polyol is adopted in the component A to replace high molecular weight polyether polyol, so that the strength and the elongation at break of the polyurethane waterproof coating are improved, and meanwhile, the plasticizer is added to reduce the viscosity of the component A, so that the construction is facilitated; the component B adopts a novel acid auxiliary agent, so that the strength of the product can be effectively improved; the silane coupling agent is added into the component A, so that the bonding strength of the product can be effectively improved, and after the isocyanate and the polyether polyol react, the silane coupling agent is prevented from reacting with the isocyanate to generate aldehydes which have hazardous substances.
2. In the prior art, polyether diol and polyether triol used in the two-component high-strength polyurethane waterproof coating depend on interpenetration between triol and diol molecules, then react with isocyanate to generate a prepolymer, then mix the AB component to finally form a space net structure to improve the strength of a product, the increase of the crosslinking degree is accompanied by the reduction of the elongation at break of the product, when the elongation at break is reduced to a certain degree, the product shows brittleness, and the strength and the elongation at break of the product are reduced; meanwhile, the coating prepared by using polyether with larger molecular weight has larger molecular weight, so that the movement capability of a chain segment is reduced, the diffusion and arrangement of crystal nuclei of the chain segment are limited, and the crystallization rate of the polymer is slow, so that the strength of a product is reduced and the elongation at break is reduced.
The invention adopts polyether diols with single functionality and different molecular weights, thus improving the tearing strength and the elongation at break of the product, and the reason is that the polyether diols are used as raw materials, the simpler the chemical structure of the molecular chain, the higher the symmetry, the smaller the steric hindrance of the substituent, the better the flexibility of the stereoregularity, and the easier the regular arrangement to form a highly ordered crystal lattice; in addition, the higher the linearity of polyether molecules, the more regular the arrangement of polyurethane molecular chains, the more effective the geometric coordination among the chain links, the greater the attractive force effect among the polyurethane molecular chains, and the stronger the unit rigidity, the easier the polymer molecules are crystallized, and the strength of the product can be improved.
3. The polyurethane waterproof material has the advantages of high tensile strength, high elongation at break, high right-angle tear strength, high bonding strength, resistance to damp-heat aging, resistance to chemical corrosion, low cost and the like, is compact in membrane, high in brightness and reliable in construction, has all performances higher than the standard TB/T2965 plus 2011 technical conditions for waterproof layers of railway concrete bridges, and is particularly suitable for application in railway bridges.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In the embodiment of the invention, the high-speed stirring speed is 400-800 rpm; the curing agent is at least one selected from ethylene glycol, 1, 4-butanediol, 1, 2-propanediol, trimethylolpropane, glycerol, triethanolamine, diethanolamine, MOCA, DMTDA, 3, 5-diamino-4-chlorobenzoic acid isobutyl ester and toluenediamine; the organic solvent is at least one selected from toluene, xylene, 120# solvent oil, 150# solvent oil, ethyl acetate and butyl acetate; the acidic auxiliary agent is at least one selected from isooctanoic acid, n-octanoic acid, n-heptanoic acid, isoheptanoic acid, n-decanoic acid and oleic acid. The starting materials used in the examples are all commercially available.
Example 1
The embodiment provides a polyurethane waterproof coating.
The component A comprises the following raw materials in percentage by weight:
the component B comprises the following raw materials in percentage by weight:
the preparation process of the component A comprises the following steps:
a. adding 30.50 parts by weight of polyether glycol 2000D, 20.57 parts by weight of polyether glycol with molecular weight value of 200-1000 and 28.55 parts by weight of diisononyl phthalate into a four-neck flask, stirring and heating to 100-120 ℃, and dehydrating for 2-3 hours under the condition that the vacuum degree is-0.1 MPa-0.05 MPa;
b. reducing the temperature to 50-70 ℃, adding 26.57 parts by weight of isocyanate under the condition of high-speed stirring, reacting for 1-2 hours, then heating to 70-100 ℃, and reacting for 3-4 hours under the stirring state;
c. cooling to 50-60 ℃, and adding 0.03 weight part of silane coupling agent under the condition of high-speed stirring;
d. cooling to 40-50 ℃, degassing for 30 minutes under the condition that the vacuum degree is-0.1 MPa-0.05 MPa, and discharging.
The preparation process of the component B comprises the following steps:
a. adding 330N 17 parts by weight of polyether triol, 12 parts by weight of diisononyl phthalate, 0.43 part by weight of defoaming agent and dispersing agent into a four-neck flask; stirring and heating to 100-120 ℃, and adding 53.54 parts by weight of ground calcium carbonate, talcum powder, iron oxide brown and 10.76 parts by weight of curing agent; dehydrating for 2-3 hours under the condition that the vacuum degree is-0.1 MPa to-0.05 MPa;
b. cooling to 50-70 ℃, and adding 5.79 parts by weight of solvent, 0.03 part by weight of dibutyltin dilaurate and 0.31 part by weight of acid additive under the condition of high-speed stirring; stirring for 1-2 hours
c. Cooling to 40-50 ℃, degassing for 30 minutes under the condition that the vacuum degree is-0.1 MPa-0.05 MPa, and discharging.
Example 2
The embodiment provides a polyurethane waterproof coating.
The component A comprises the following raw materials in percentage by weight:
the component B comprises the following raw materials in percentage by weight:
the preparation process of the component A comprises the following steps:
a. adding 15.60 parts by weight of polyether glycol 2000D, 45.80 parts by weight of polyether glycol with molecular weight value of 200-1000 and 8.60 parts by weight of chlorinated paraffin into a four-neck flask, stirring and heating to 100-120 ℃, and dehydrating for 2-3 hours under the condition that the vacuum degree is-0.1 MPa-0.05 MPa;
b. reducing the temperature to 50-70 ℃, adding 29.90 parts by weight of isocyanate under the condition of high-speed stirring, reacting for 1-2 hours, then heating to 70-100 ℃, and reacting for 3-4 hours under the stirring state;
c. cooling to 50-60 ℃, and adding 0.10 weight part of silane coupling agent under the condition of high-speed stirring;
d. cooling to 40-50 ℃, degassing for 30 minutes under the condition that the vacuum degree is-0.1 MPa-0.05 MPa, and discharging.
The preparation process of the component B comprises the following steps:
a. adding 10.46 parts by weight of polyether triol 330N, 22.10 parts by weight of chlorinated paraffin, and 0.37 part by weight of defoaming agent and dispersing agent in total into a four-neck flask; stirring and heating to 100-120 ℃, and adding 53.30 parts by weight of ground limestone, talcum powder and iron oxide brown and 10.99 parts by weight of curing agent; dehydrating for 2-3 hours under the condition that the vacuum degree is-0.1 MPa to-0.05 MPa;
b. cooling to 50-70 ℃, and adding 2.68 parts by weight of solvent, 0.04 part by weight of dibutyltin dilaurate and 0.07 part by weight of acid additive under the condition of high-speed stirring; stirring for 1-2 hours
c. Cooling to 40-50 ℃, degassing for 30 minutes under the condition that the vacuum degree is-0.1 MPa-0.05 MPa, and discharging.
Example 3
The embodiment provides a polyurethane waterproof coating.
The component A comprises the following raw materials in percentage by weight:
the component B comprises the following raw materials in percentage by weight:
the preparation process of the component A comprises the following steps:
a. adding 20.08 weight parts of polyether glycol 2000D, 24.50 weight parts of polyether glycol with molecular weight value of 200-1000 and 28.80 weight parts of chlorinated paraffin into a four-neck flask, stirring and heating to 100-120 ℃, and dehydrating for 2-3 hours under the condition that the vacuum degree is-0.1 MPa to-0.05 MPa;
b. reducing the temperature to 50-70 ℃, adding 30.85 parts by weight of isocyanate under the condition of high-speed stirring, reacting for 1-2 hours, then heating to 70-100 ℃, and reacting for 3-4 hours under the stirring state;
c. cooling to 50-60 ℃, and adding 0.05 weight part of silane coupling agent under the condition of high-speed stirring;
d. cooling to 40-50 ℃, degassing for 30 minutes under the condition that the vacuum degree is-0.1 MPa-0.05 MPa, and discharging.
The preparation process of the component B comprises the following steps:
a. adding 330N 15.46 parts by weight of polyether triol, 27.10 parts by weight of chlorinated paraffin, 0.37 part by weight of defoaming agent and dispersing agent into a four-neck flask; stirring and heating to 100-120 ℃, and adding 55.41 parts by weight of ground limestone, talcum powder and iron oxide brown and 13.10 parts by weight of curing agent; dehydrating for 2-3 hours under the condition that the vacuum degree is-0.1 MPa to-0.05 MPa;
b. reducing the temperature to 50-70 ℃, and adding 2.68 parts by weight of solvent, 0.04 part by weight of catalyst and 0.07 part by weight of acid additive under the condition of high-speed stirring; stirring for 1-2 hours
c. Cooling to 40-50 ℃, degassing for 30 minutes under the condition that the vacuum degree is-0.1 MPa-0.05 MPa, and discharging.
The polyurethane waterproofing coatings prepared in examples 1 to 3 were coated to a thickness of about 1.5mm, and tested according to GB/T19250-2013 polyurethane waterproofing coating, and the test data are shown in Table 1:
TABLE 1
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (9)
1. The polyurethane waterproof coating is characterized by comprising a component A and a component B:
the component A comprises:
20-40 parts of isocyanate, 10-40 parts of hydroxyl-terminated polyether glycol with molecular weight of 2000-5000-;
the component B comprises:
5-20 parts of hydroxyl-terminated polyether polyol, 10-40 parts of plasticizer, 2-8 parts of organic solvent, 45-70 parts of pigment and filler, 0.02-0.05 part of catalyst, 5-25 parts of curing agent, 0.3-0.45 part of high-performance assistant and 0.05-0.4 part of acid assistant;
the high-performance auxiliary agent is selected from at least one of a defoaming agent, a leveling agent, an anti-settling agent, a coupling agent, an antioxidant, a retarder and a dispersing agent;
the curing agent is at least one selected from ethylene glycol, 1, 4-butanediol, 1, 2-propanediol, trimethylolpropane, glycerol, triethanolamine, diethanolamine, MOCA, DMTDA, 3, 5-diamino-4-chlorobenzoic acid isobutyl ester and toluenediamine;
the acidic auxiliary agent is at least one selected from isooctanoic acid, n-octanoic acid, n-heptanoic acid, isoheptanoic acid, n-decanoic acid and oleic acid.
2. The polyurethane waterproofing coating according to claim 1,
the component A comprises:
26-31 parts of isocyanate, 15-35 parts of hydroxyl-terminated polyether glycol with molecular weight of 2000-5000-;
the component B comprises:
10-17 parts of hydroxyl-terminated polyether polyol, 12-28 parts of plasticizer, 2.5-6 parts of organic solvent, 50-60 parts of pigment and filler, 0.03-0.04 part of catalyst, 10-15 parts of curing agent, 0.3-0.45 part of high-performance assistant and 0.07-0.35 part of acid assistant.
3. The polyurethane waterproof coating material according to claim 1 or 2, wherein the isocyanate is toluene diisocyanate and/or diphenylmethane diisocyanate.
4. The polyurethane waterproof coating material according to claim 1 or 2, wherein,
the hydroxyl-terminated polyether polyol is selected from at least one of PPG polyether polyol and POP polyether polyol;
the PPG polyether polyol and the POP polyether polyol are respectively selected from at least one of polyether diol and polyether triol;
the molecular weight of the hydroxyl-terminated polyether polyol is 500-5000, and the hydroxyl value is 40-400mg KOH/g.
5. The polyurethane waterproof coating material according to claim 1 or 2, wherein,
the silane coupling agent is selected from at least one of KH550, KH560, KH570, KH792, DL602 and DL 171.
6. The polyurethane waterproof coating material according to claim 1 or 2, wherein the catalyst is an organometallic catalyst and/or a tertiary amine-based catalyst;
the organic metal catalyst is selected from at least one of dibutyltin dilaurate, stannous octoate, bismuth isooctanoate and zinc neodecanoate;
the tertiary amine catalyst is selected from at least one of aliphatic tertiary amine, aromatic tertiary amine and alcohol tertiary amine and ammonium salt compounds thereof.
7. The polyurethane waterproof coating material according to claim 1 or 2, wherein,
the organic solvent is at least one selected from toluene, xylene, 120# solvent oil, 150# solvent oil, ethyl acetate and butyl acetate;
the pigment and filler is selected from at least one of carbon black, titanium dioxide, indigo, iron yellow, iron oxide brown, kaolin, cement, heavy calcium carbonate, barium sulfate, magnesium oxide, calcium oxide, wollastonite, silica micropowder and talcum powder;
the plasticizer is selected from at least one of dioctyl phthalate, dibutyl phthalate, diisononyl phthalate, chlorinated paraffin and citrate plasticizer.
8. The polyurethane waterproof coating material according to claim 1 or 2, wherein,
the preparation method of the component A comprises the following steps:
step 1-1: mixing hydroxyl-terminated polyether glycol with molecular weight of 2000-5000-;
step 1-2: cooling to a second temperature, adding isocyanate under a high-speed stirring state to perform a first reaction, and then keeping or heating to a third temperature to perform a second reaction;
step 1-3: cooling to a second temperature, and adding a silane coupling agent under a high-speed stirring state;
step 1-4: keeping or cooling to a fourth temperature, and degassing under a vacuum condition to obtain the component A;
the preparation method of the component B comprises the following steps:
step 2-1: mixing hydroxyl-terminated polyether polyol, a plasticizer and a high-performance auxiliary agent, stirring and heating to a first temperature, adding a pigment filler and a curing agent, and dehydrating under a vacuum condition;
step 2-2: cooling to a second temperature, adding the organic solvent, the catalyst and the acidic auxiliary agent under the high-speed stirring state, and continuing stirring;
step 3-3: keeping or reducing the temperature to a fourth temperature, and degassing under a vacuum condition to obtain the component B.
9. The polyurethane waterproofing coating according to claim 8,
the vacuum condition is-0.1 MPa to-0.05 MPa, the dehydration time is 2 to 3 hours, and the degassing time is 20 to 40 minutes;
the time of the first reaction is 1-2 h, and the time of the second reaction is 3-4 h;
the first temperature is 100-120 ℃, the second temperature is 50-70 ℃, the third temperature is 70-100 ℃, and the fourth temperature is 40-50 ℃;
the high-speed stirring speed is 400-800 rpm.
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| CN110117453A (en) * | 2019-04-29 | 2019-08-13 | 广东优美仕新材料科技有限公司 | A kind of composite modified water-repellent paint of polyureas and its processing technology |
| CN110551445A (en) * | 2019-09-18 | 2019-12-10 | 江苏凯伦建材股份有限公司 | Water-repellent coating and use thereof |
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| CN110698969B (en) * | 2019-10-16 | 2021-08-13 | 李承德 | Polyurethane waterproof coating and preparation method thereof |
| CN111073488A (en) * | 2019-12-30 | 2020-04-28 | 江苏和宇新材料有限公司 | Preparation method of polyurethane waterproof coating |
| CN111057205B (en) * | 2019-12-30 | 2020-10-30 | 太原科技大学 | Hyperbranched polyurethane elastomer material, preparation method and application thereof |
| CN111675958A (en) * | 2020-07-08 | 2020-09-18 | 王振海 | Protective coating material for ships, naval vessels and offshore drilling platforms and preparation method |
| CN114149196A (en) * | 2020-09-07 | 2022-03-08 | 河南省蓝岛环保科技有限公司 | Permeable multifunctional waterproof agent and preparation method thereof |
| CN112980312A (en) * | 2021-03-05 | 2021-06-18 | 亚士防水科技(滁州)有限公司 | Two-component polyurethane waterproof coating and preparation method thereof |
| CN113388322A (en) * | 2021-06-28 | 2021-09-14 | 四川省飞翎防水科技有限公司 | Polyurethane waterproof coating and preparation method thereof, and bi-component polyurethane waterproof coating and preparation method thereof |
| CN114410210B (en) * | 2021-12-31 | 2023-03-21 | 北京东方雨虹防水技术股份有限公司 | Bi-component anti-sagging polyurethane waterproof coating and preparation method thereof |
| CN115124565B (en) * | 2022-07-08 | 2023-05-30 | 科顺防水科技股份有限公司 | Method for preparing rare earth-based silane coupling agent, rare earth-based silane coupling agent and two-component polyurethane waterproof coating composition |
| CN116855165A (en) * | 2023-07-14 | 2023-10-10 | 河北金坤工程材料有限公司 | High-performance polyurethane waterproof paint |
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