Odorless environment-friendly single-component polyurethane waterproof coating and preparation method thereof

Abstract

The invention relates to the technical field of coatings, in particular to an odorless environment-friendly single-component polyurethane waterproof coating and a preparation method thereof. The preparation raw materials of the single-component polyurethane waterproof coating provided by the invention do not comprise a latent curing agent, and the single-component polyurethane waterproof coating comprises the following components in parts by weight: 140-245 parts of polyether polyol; 0.5 to 1.5 parts of a small molecule chain extender; 38 to 42 parts of diisocyanate; 0.1 to 0.3 part of a stabilizing agent; 1.0 to 8.0 parts of a carbon dioxide absorbent; 0.5 to 1.0 part of a catalyst; the catalyst is a chelated tin catalyst. The polyether polyol is prepared from 20 to 60 parts of polytetrahydrofuran polyol; the one-component polyurethane waterproof coating provided by the invention has excellent environmental protection property, long storage period, good constructability, high tensile strength, high elongation at break, strong bonding strength and other excellent mechanical properties.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, in particular to a non-odor environmentally friendly single-component polyurethane waterproof coating and a preparation method thereof. BACKGROUND

[0002] As an important application component of polyurethane synthetic materials, polyurethane waterproof coating has become one of the main materials in the field of building waterproofing due to its unique performance advantages. This type of coating has good film elasticity, good elongation, strong adhesion, and small volume shrinkage, etc. The waterproof layer formed has no joints and can adapt to the expansion and deformation of the base layer cracks. In addition, it is easy to maintain and can be easily applied on any complex structure surface, and is widely used in waterproof and leakage repair engineering of different parts of buildings.

[0003] In recent years, single-component polyurethane waterproof coating has been favored by the market due to its many advantages and has gradually become the development direction of polyurethane waterproof coating. Compared with two-component coating, single-component coating has no measurement error during construction, and the professional quality of the construction personnel is not high, and the viscosity is low, which is easy to construct. At the same time, it also has the advantages of long pot life, stable performance, easy to use, wide application, etc. Its use continues to grow and has been widely recognized by users.

[0004] However, the mainstream single-component polyurethane waterproof coating on the market still faces multiple technical challenges: (1) Environmental friendliness: Most of the existing single-component polyurethane waterproof coatings on the market are solvent-based products. Although the addition of organic solvents helps to reduce the viscosity of the coating and improve the construction performance, with the increase of the amount of organic solvents, the volatile organic compound (VOC) content of the coating also increases, which is contrary to the increasingly stringent environmental regulations.

[0005] (2) Odor and health problems: Even some coatings that do not add organic solvents, the conventional latent curing agent used in the formula may release low molecular weight aldehyde substances such as formaldehyde, acetaldehyde, benzaldehyde, and isobutyl aldehyde during the curing process of the coating. The volatilization of these aldehyde substances not only contributes to the VOC emission value, but also produces irritating odors, especially in relatively closed construction spaces, which adversely affects the health of construction personnel.

[0006] (3) Limitations of conventional latent curing agents: Although the addition of conventional latent curing agents aims to solve the problems of foaming in the construction coating and improve the poor storage stability of single-component polyurethane waterproof coatings (for example, to avoid excessive viscosity growth during storage, especially after high-temperature storage, which can lead to performance degradation, affect construction, or even curing), they also have their shortcomings. Due to their high activity, conventional latent curing agent systems are prone to hydrolysis during storage, resulting in increased product viscosity. Generally speaking, the viscosity growth rate of such products may be as high as 40% or more after 3-6 months of storage. The longer the storage time, the greater the viscosity growth, resulting in a short product shelf life that cannot meet the actual product turnover and shelf-life requirements.

[0007] Therefore, how to prepare an environmentally friendly single-component polyurethane waterproof coating that does not bubble during construction, has extremely low VOC content, good storage stability, long shelf life, and is odorless has become an urgent technical problem to be solved. Summary of the Invention

[0008] This invention provides an odorless and environmentally friendly single-component polyurethane waterproof coating and its preparation method, which solves the problems of existing single-component polyurethane waterproof coatings, such as high VOC content, irritating odor during construction, easy blistering of the coating film, and poor product storage stability.

[0009] According to a first aspect of the present invention, the present invention provides an odorless and environmentally friendly one-component polyurethane waterproof coating, the raw materials for which do not include a latent curing agent, and include the following components: 140-245 parts by weight of polyether polyol; 0.5~1.5 parts by weight of small molecule chain extender; 38-42 parts by weight of diisocyanate; Stabilizer 0.1~0.3 parts by weight; Carbon dioxide absorbent: 1.0~8.0 parts by weight; Catalyst: 0.5~1.0 parts by weight; The catalyst is a chelated tin catalyst; The polyether polyol includes polytetrahydrofuran polyol, and the polytetrahydrofuran polyol is present in a quantity of 20-60 parts by weight.

[0010] The single-component polyurethane waterproof coating formulation provided by this invention does not use conventional latent curing agents, fundamentally eliminating the release of irritating substances such as formaldehyde and acetaldehyde due to the decomposition of latent curing agents. This results in a truly odorless, environmentally friendly product with extremely low VOC content. This invention employs a specific material combination, with synergistic effects between the components, achieving excellent mechanical properties even without the addition of latent curing agents. The product exhibits high strength, large elongation, good stability, minimal viscosity change during long-term storage, and no bubbling after application.

[0011] The odorless environmentally friendly single-component polyurethane waterproof coating according to the present application, the chelated tin catalyst includes one or more of acetylacetone tin, octanoyl acetone tin, pentaerythritol tin, trimethylolpropane tin, diethanolamine tin and triethanolamine tin.

[0012] The chelated tin catalyst has low activity during sealed storage, which endows the product with excellent storage stability and significantly prolonged shelf life, and solves the problem of too fast viscosity growth of the traditional product; and the catalyst can quickly restore high activity after meeting water in the air during construction, which ensures the normal curing speed. Experimental results show that, compared with the organotin catalyst (such as dibutyltin dilaurate) used in the existing product, the chelated tin catalysts used in the present application can make the single-component polyurethane waterproof coating have better film effect after construction, better storage stability, and lower viscosity growth value of the coating after 30 days of hot storage.

[0013] The odorless environmentally friendly single-component polyurethane waterproof coating according to the present application, the stabilizer is one or more of benzoyl chloride, p-toluenesulfonyl chloride, acid anhydride and vinyltrimethoxysilane, and is preferably benzoyl chloride.

[0014] The single-component polyurethane waterproof coating provided by the present application adds a certain amount of stabilizer, which is used to consume the residual raw materials in the production process and the moisture entering the packaging container from the outside during storage, and solves the problem of product viscosity growth caused by the reaction of NCO with water during storage. Experimental results show that the stabilizers used in the present application can significantly improve the storage stability of the coating.

[0015] The odorless environmentally friendly single-component polyurethane waterproof coating according to the present application, the polyether polyol further includes, in addition to the non-polytetrahydrofuran polyol, 75-100 parts by weight of polyether diol and 45-85 parts by weight of polyether triol. This specific ratio realizes the effective balance between soft segments and hard segments, so that the coating after curing not only maintains high flexibility, but also has excellent mechanical strength.

[0016] Preferably, the polyether diol has a number average molecular weight of 1000-2000, a functionality of 2, and a hydroxyl value of 56.1-112.2 mgKOH / g.

[0017] Preferably, the polyether diol is selected from at least one of DL-1000D and DL-2000D. In some specific embodiments, the polyether diol is selected from DL-2000D or DL-1000D purchased from Shandong Lansheng Dongda Co., Ltd.

[0018] Preferably, the polyether triol has a number average molecular weight of 1000-5000, a functionality of 3, and a hydroxyl value of 33.66-56.1 mgKOH / g.

[0019] Preferably, the polyether triol is selected from at least one of MN1000, EP330N.

[0020] In some embodiments, the polyether triol is selected from EP330N or MN1000, available from Shandong Lansheng Dongda Co., Ltd.

[0021] The single-component polyurethane waterproof coating provided by the application introduces polytetrahydrofuran polyol and small molecule chain extender into the polyether polyol, solves the problem of poor tear strength and bonding strength caused by the small number of urethane bonds and urea bonds on the polymer chain segment of the latent curing system and poor chain segment regularity, and enables the cured coating film to have excellent mechanical properties.

[0022] The odorless environmentally friendly single-component polyurethane waterproof coating according to the application uses polytetrahydrofuran diol as the polytetrahydrofuran polyol, which can effectively enhance the ability of the coating to resist tearing damage and the firmness of adhesion to the base layer without sacrificing other properties, thereby improving the overall reliability and service life of the waterproof coating.

[0023] Preferably, the number average molecular weight of the polytetrahydrofuran diol is 1000-2000.

[0024] In some embodiments, the polytetrahydrofuran diol is selected from PTMG-1000 or PTMG-2000, available from Guangzhou Zhanhong Trade Co., Ltd.

[0025] The odorless environmentally friendly single-component polyurethane waterproof coating according to the application uses one or more of diamine chain extenders or diol chain extenders as the small molecule chain extender; the diamine chain extender includes one or more of isophorone diamine, ethylenediamine, dimethylthio toluene diamine, and diethyl toluene diamine; and the diol chain extender includes one or more of 1,4 butanediol, 1,6 hexanediol, diethylene glycol, and 1,4 cyclohexanediol.

[0026] The odorless environmentally friendly single-component polyurethane waterproof coating according to the application further includes the following raw material components in its preparation raw materials: 150-260 parts by weight of color fillers.

[0027] The odorless environmentally friendly single-component polyurethane waterproof coating according to the application uses one or more of nano calcium carbonate, talc powder, fumed silica, heavy calcium, kaolin, wollastonite powder, mica powder, titanium dioxide, and carbon black as the color filler.

[0028] The odorless environmentally friendly single-component polyurethane waterproof coating according to the application uses one or more of toluene diisocyanate, diphenyl methane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate as the diisocyanate.

[0029] The odorless environment-friendly single-component polyurethane waterproof coating according to the present application, the carbon dioxide absorbent is selected from one or more of zeolite, activated carbon, calcium oxide, magnesium oxide, molecular sieve, diatomite and polystyrene-divinylbenzene resin.

[0030] The addition of the carbon dioxide absorbent can absorb the trace amount of carbon dioxide possibly generated in the reaction, thereby effectively avoiding the blistering of the coating film and ensuring the compactness and integrity of the waterproof layer, and further reducing the VOC contribution value due to the emission of carbon dioxide.

[0031] In some specific embodiments, the carbon dioxide absorbent is selected from a molecular sieve. Optionally, the molecular sieve includes one or more of A-type molecular sieve, X-type molecular sieve and Y-type molecular sieve. Preferably, the molecular sieve has a pore size of 0.5-1.0 nm and a specific surface area of 500-1000 m 2 / g.

[0032] A-type molecular sieve: cubic crystal system, framework structure is LTA type, performance characteristics: uniform pore size, strong adsorption selectivity for small molecules, large adsorption capacity, especially outstanding adsorption capacity for water and carbon dioxide.

[0033] X and Y-type molecular sieve: cubic crystal system, large pore size, extremely high specific surface energy, many adsorption and catalytic active sites, can adsorb large molecules.

[0034] The odorless environment-friendly single-component polyurethane waterproof coating according to the present application, the preparation raw material further includes the following raw material components: 100-150 parts by weight of plasticizer.

[0035] The appropriate amount of plasticizer can effectively reduce the viscosity of the entire formula system, so that the finished coating has good fluidity and workability, and can also significantly improve the flexibility of the coating film after curing.

[0036] Preferably, the plasticizer is selected from one or more of vegetable oil ester, tricoctyl phosphate, citric acid ester, acetyl tributyl citrate and chlorinated paraffin plasticizer.

[0037] The odorless environment-friendly single-component polyurethane waterproof coating according to the present application, the preparation raw material does not include latent curing agent, and includes the following components: Polyether diol 80-100 parts by weight; Polyether triol 50-85 parts by weight; Polytetrahydrofuran polyol 20-60 parts by weight; Small molecule chain extender 0.5-1.5 parts by weight; Plasticizer 100-150 parts by weight; Color filler 150-260 parts by weight; Diisocyanate 38-42 parts by weight; Stabilizer 0.1-0.3 parts by weight; Carbon dioxide absorbent 1.0-8.0 parts by weight; Catalyst 0.5-1.0 parts by weight.

[0038] Preferably, the odorless environment-friendly single-component polyurethane waterproof coating according to the present application does not include a latent curing agent, and comprises the following components: Polyether diol 80-100 parts by weight; Polyether triol 50-65 parts by weight; Polytetrahydrofuran polyol 20-30 parts by weight; Small molecule chain extender 0.5-1.0 parts by weight; Plasticizer 100-150 parts by weight; Color filler 150-260 parts by weight; Diisocyanate 38-42 parts by weight; Stabilizer 0.2-0.3 parts by weight; Carbon dioxide absorbent 1-5 parts by weight; Catalyst 0.8-1.0 parts by weight.

[0039] The present application also provides a preparation method of the odorless environment-friendly single-component polyurethane waterproof coating described above, comprising the following steps: Mixing polyether polyol, polytetrahydrofuran polyol, small molecule chain extender and color filler to obtain a mixed slurry; Adding diisocyanate and part of the catalyst to the mixed slurry at 70-80℃, and then heating to 75-85℃, and reacting for 2-3 hours; then adding carbon dioxide absorbent at 75-85℃, and continuing to stir and react; and then cooling to 55-65℃, and adding the remaining part of the catalyst and the stabilizer.

[0040] The present application precisely controls the reaction process, effectively avoids side reactions, and ensures that the product can be thickly coated without bubbling and has excellent storage stability, thereby overcoming the technical bottleneck of single-component coating easy to fail and limited construction.

[0041] According to the preparation method of the odorless environment-friendly single-component polyurethane waterproof coating, the mixed slurry is dehydrated before adding the diisocyanate and part of the catalyst; preferably, the dehydration is carried out at a temperature of 100-110℃ and a relative vacuum degree of -0.08 to -0.1 MPa for 2-3 hours.

[0042] The present application adopts specific conditions for efficient and thorough dewatering treatment of the mixed slurry, which can maximize the removal of free moisture in the system, fundamentally eliminating the side reaction of high-activity diisocyanate (-NCO group) with water in the subsequent process, thereby effectively avoiding the problems of barrel expansion during coating storage and bubble generation in the curing process due to the generation of carbon dioxide gas. At the same time, this step also ensures that isocyanate can accurately react with polyol to generate target polyurethane prepolymer, avoiding the invalid consumption of raw materials and the generation of unstable urea bonds, laying a foundation for obtaining excellent storage stability and performance uniformity of the final product.

[0043] According to the preparation method of the odorless environmentally friendly single-component polyurethane waterproof coating, the carbon dioxide absorbent is added and continues to be stirred and reacted for 0.5-1 hours. In this way, the carbon dioxide absorbent can be fully and uniformly dispersed in the entire high-viscosity prepolymer system, so as to capture the residual trace amount of moisture in the system and the carbon dioxide gas that may be generated in the subsequent storage or moisture curing process without dead angles.

[0044] According to the preparation method of the odorless environmentally friendly single-component polyurethane waterproof coating, the remaining part of the catalyst and the stabilizer are added and stirred for 0.5-1 hours. In this way, it can ensure that the stabilizer and the catalyst are thoroughly and uniformly dispersed in the high-viscosity prepolymer system.

[0045] The present application has the following advantages: The odorless environmentally friendly single-component polyurethane waterproof coating provided by the present application does not use conventional latent curing agents, which fundamentally eliminates the release of irritating odor substances such as aldehydes during the curing process, realizes the true odorlessness and extremely low VOC emission of the product. At the same time, the present application innovatively uses chelated tin catalyst, stabilizer, carbon dioxide absorbent and specific polyol combination, and the components synergistically act, not only solving the technical pain points of poor storage stability and short shelf life of traditional products, making the viscosity of the coating increase extremely small after heat storage, but also effectively avoiding the problem of film blistering during construction. The waterproof coating obtained finally has excellent environmental friendliness, long storage period, good workability, and excellent mechanical properties such as high tensile strength, high elongation at break and strong adhesive strength. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0047] The raw materials used in the following examples and comparative examples are as follows: Polyether diols: DL-2000D, purchased from Shandong Lansheng Dongda Co., Ltd., with a functionality of 2 and a number average molecular weight of 2000; DL-1000D, purchased from Shandong Lansheng Dongda Co., Ltd., with a functionality of 2 and a number average molecular weight of 1000.

[0048] Polyether triols: EP330N, purchased from Shandong Lansheng Dongda Co., Ltd., with a functionality of 3 and a number average molecular weight of 5000; MN1000, purchased from Shandong Lansheng Dongda Co., Ltd., with a functionality of 3 and a number average molecular weight of 1000.

[0049] Polytetrahydrofuran diols: PTMG-2000, purchased from Guangzhou Zhanhong Trading Co., Ltd., with a functionality of 2 and a molecular weight of 2000; PTMG1000, purchased from Guangzhou Zhanhong Trading Co., Ltd., with a functionality of 2 and a molecular weight of 1000.

[0050] Catalyst octanoyl acetyl tin, purchased from Shanghai Maikelin Biochemical Technology Co., Ltd.

[0051] Molecular sieve, purchased from Jiangxi Xintao Technology Co., Ltd., model 5A molecular sieve activated powder.

[0052] Other raw materials not specifically mentioned are ordinary commercially available products.

[0053] The preparation method of the single-component polyurethane waterproof coating of the following examples includes the following steps: (1) Add polyether diols, polyether triols, polytetrahydrofuran polyols, small molecule chain extenders, plasticizers, and gradually add talc and heavy calcium carbonate into a strong disperser, and disperse uniformly.

[0054] (2) Transfer the dispersed slurry to a reaction kettle, stir and heat to 100-110°C, and dehydrate under a relative vacuum degree of -0.08 to -0.1 MPa for 2-3 hours.

[0055] (3) Reduce the temperature to 70-80°C, then gradually add diisocyanate, stir, then add 1 / 4-1 / 2 of the formula amount of catalyst, heat to 75-85°C, and react for 2-3 hours.

[0056] (4) Keep the temperature at 75-85°C, add a carbon dioxide absorber, and continue to stir and react for 0.5-1 hour.

[0057] (5) Cool to 55-65°C, add the remaining formula amount of catalyst and stabilizer, and stir for 0.5-1 hour.

[0058] (6) Cool to below 55°C, protect with nitrogen, and discharge.

[0059] Example 1 The embodiment provides a non-odor environment-friendly single-component polyurethane waterproof coating prepared from the following raw materials: DL-2000D 100 parts by weight; PTMG-2000 23 parts by weight; 1,4 butanediol 0.6 parts by weight; EP330N 58 parts by weight; acetyl tributyl citrate 145 parts by weight; talcum 150 parts by weight; heavy calcium 105 parts by weight; TDI 40.5 parts by weight; molecular sieve 1.2 parts by weight; benzoyl chloride 0.1 parts by weight; tin octoate 0.8 parts by weight.

[0060] The embodiment also provides a preparation method of the single-component polyurethane waterproof coating, and the method comprises the following steps: (1) adding polyether polyol DL-2000D, PTMG-2000, EP330N, 1,4-butylene glycol, plasticizer acetyl tributyl citrate, gradually adding talcum and heavy calcium into a strong dispersing machine and uniformly dispersing.

[0061] (2) transferring the dispersed slurry into a reaction kettle, stirring and heating to 110 DEG C, and dehydrating for 3 hours under a relative vacuum degree of -0.09 MPa.

[0062] (3) reducing the temperature to 75 DEG C, then gradually adding diisocyanate TDI, stirring, then adding 1 / 3 of the formula amount of catalyst, heating to 80 DEG C, and reacting for 2 hours.

[0063] (4) keeping the temperature at 80 DEG C, adding molecular sieve, and continuing to stir and react for 1 hour.

[0064] (5) reducing the temperature to 60 DEG C, adding the remaining formula amount of catalyst and benzoyl chloride, and stirring for 0.5 hours.

[0065] (6) reducing the temperature to below 55 DEG C, protecting by nitrogen, and discharging.

[0066] Embodiment 2 The embodiment provides a non-odor environment-friendly single-component polyurethane waterproof coating prepared from the following raw materials: DL-2000D 80 parts by weight; PTMG2000 43 parts by weight; 1,4 butanediol 0.6 parts by weight; EP330N 58 parts by weight; acetyl tri-butyl citrate 145 parts by weight; talc 150 parts by weight; heavy calcium 105 parts by weight; TDI 40.5 parts by weight; molecular sieve 1.2 parts by weight; benzoyl chloride 0.1 parts by weight; tin octoate acetylacetone 0.8 parts by weight.

[0067] The embodiment also provides a preparation method of the single-component polyurethane waterproof coating, comprising the following steps: (1) adding polyether polyol DL-2000D, PTMG-2000, EP330N, 1,4-butanediol, plasticizer acetyl tri-butyl citrate, gradually adding talc and heavy calcium into a strong dispersion machine and uniformly dispersing.

[0068] (2) transferring the dispersed slurry into a reaction kettle, stirring and heating to 110℃, and dehydrating for 3 hours under a relative vacuum degree of -0.09MPa.

[0069] (3) reducing the temperature to 75℃, then gradually adding diisocyanate TDI, stirring, then adding 1 / 3 of the formula amount of catalyst, heating to 80℃, and reacting for 2 hours.

[0070] (4) keeping the temperature at 80℃, adding molecular sieve, and continuing to stir and react for 1 hour.

[0071] (5) reducing the temperature to 60℃, adding the remaining formula amount of catalyst and benzoyl chloride, and stirring for 0.5 hours.

[0072] (6) reducing the temperature to below 55℃, protecting by nitrogen, and discharging.

[0073] Example 3 The embodiment provides a single-component polyurethane waterproof coating without odor and environmentally friendly, which is prepared from the following raw materials: DL-2000D 80 parts by weight; PTMG2000 23 parts by weight; 1,4-butanediol 0.6 parts by weight; EP330N 78 parts by weight; acetyl tri-butyl citrate 145 parts by weight; talc 150 parts by weight; heavy calcium 105 parts by weight; TDI 40.5 parts by weight; molecular sieve 1.2 parts by weight; benzoyl chloride 0.1 parts by weight; tin octoate acetylacetone 0.8 parts by weight.

[0074] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, which comprises the following steps: (1) adding polyether polyol DL-2000D, PTMG-2000, EP330N, 1,4-butanediol, plasticizer acetyl citric acid tributyl ester into a strong dispersion machine, and gradually adding talc and heavy calcium carbonate and uniformly dispersing.

[0075] (2) transferring the dispersed slurry into a reaction kettle, stirring and heating to 110 ℃, and dehydrating for 3 hours under a relative vacuum degree of -0.09 MPa.

[0076] (3) reducing the temperature to 75 ℃, then gradually adding diisocyanate TDI, stirring, then adding 1 / 3 of the formula amount of catalyst, heating to 80 ℃, and reacting for 2 hours.

[0077] (4) keeping the temperature at 80 ℃, adding molecular sieve, and continuing to stir and react for 1 hour.

[0078] (5) reducing the temperature to 60 ℃, adding the remaining formula amount of catalyst and benzoyl chloride, and stirring for 0.5 hours.

[0079] (6) reducing the temperature to below 55 ℃, protecting by nitrogen, and discharging.

[0080] Example 4 The embodiment provides a non-odor environmentally-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the single-component polyurethane waterproof coating and that of the single-component polyurethane waterproof coating in Example 1 is that the amount of PTMG2000 is 60 parts.

[0081] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, which has the same preparation method as that in Example 1.

[0082] Example 5 The embodiment provides a non-odor environmentally-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the single-component polyurethane waterproof coating and that of the single-component polyurethane waterproof coating in Example 1 is that the same amount of PTMG1000 is used to replace PTMG2000.

[0083] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, which has the same preparation method as that in Example 1.

[0084] Example 6 The embodiment provides a non-odor environmentally-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the single-component polyurethane waterproof coating and that of the single-component polyurethane waterproof coating in Example 1 is that the same amount of DL-1000D is used to replace DL-2000D.

[0085] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, which has the same preparation method as that in Example 1.

[0086] Example 7 The present example provides a non-odor environmentally friendly single-component polyurethane waterproof coating, the difference between the raw material composition and example 1 is only that MN1000 is used instead of EP330N.

[0087] The present example also provides a preparation method of the single-component polyurethane waterproof coating, the preparation method is the same as example 1.

[0088] Example 8 The present example provides a non-odor environmentally friendly single-component polyurethane waterproof coating, the difference between the raw material composition and example 1 is only that 1,4-butanediol is 0.5 parts.

[0089] The present example also provides a preparation method of the single-component polyurethane waterproof coating, the preparation method is the same as example 1.

[0090] Example 9 The present example provides a non-odor environmentally friendly single-component polyurethane waterproof coating, the difference between the raw material composition and example 1 is only that 1,4-butanediol is 1 part.

[0091] The present example also provides a preparation method of the single-component polyurethane waterproof coating, the preparation method is the same as example 1.

[0092] Example 10 The present example provides a non-odor environmentally friendly single-component polyurethane waterproof coating, the difference between the raw material composition and example 1 is only that 1,4-butanediol is 1.5 parts.

[0093] The present example also provides a preparation method of the single-component polyurethane waterproof coating, the preparation method is the same as example 1.

[0094] Example 11 The present example provides a non-odor environmentally friendly single-component polyurethane waterproof coating, the difference between the raw material composition and example 1 is only that benzoyl chloride is 0.2 parts.

[0095] The present example also provides a preparation method of the single-component polyurethane waterproof coating, the preparation method is the same as example 1.

[0096] Example 12 The present example provides a non-odor environmentally friendly single-component polyurethane waterproof coating, the difference between the raw material composition and example 1 is only that benzoyl chloride is 0.3 parts.

[0097] The present example also provides a preparation method of the single-component polyurethane waterproof coating, the preparation method is the same as example 1.

[0098] Example 13 The embodiment provides an odorless environment-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the single-component polyurethane waterproof coating and that of the embodiment 1 is that acetic anhydride is used to replace the same amount of benzoyl chloride.

[0099] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, and the preparation method is the same as that of the embodiment 1.

[0100] Embodiment 14 The embodiment provides an odorless environment-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the single-component polyurethane waterproof coating and that of the embodiment 1 is that vinyl trimethoxysilane is used to replace the same amount of benzoyl chloride.

[0101] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, and the preparation method is the same as that of the embodiment 1.

[0102] Embodiment 15 The embodiment provides an odorless environment-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the single-component polyurethane waterproof coating and that of the embodiment 1 is that p-toluenesulfonyl chloride is used to replace the same amount of benzoyl chloride.

[0103] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, and the preparation method is the same as that of the embodiment 1.

[0104] Embodiment 16 The embodiment provides an odorless environment-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the single-component polyurethane waterproof coating and that of the embodiment 1 is that the amount of stannic octoate acetylacetone is 0.5 parts.

[0105] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, and the preparation method is the same as that of the embodiment 1.

[0106] Embodiment 17 The embodiment provides an odorless environment-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the single-component polyurethane waterproof coating and that of the embodiment 1 is that the amount of stannic octoate acetylacetone is 1.0 parts.

[0107] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, and the preparation method is the same as that of the embodiment 1.

[0108] Embodiment 18 The embodiment provides an odorless environment-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the single-component polyurethane waterproof coating and that of the embodiment 1 is that the same amount of stannic acetylacetone is used to replace stannic octoate acetylacetone.

[0109] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, and the preparation method is the same as that of the embodiment 1.

[0110] Embodiment 19 The embodiment provides a non-odor environment-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the non-odor environment-friendly single-component polyurethane waterproof coating and that of the embodiment 1 is that the molecular sieve is 1 part.

[0111] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, and the preparation method is the same as that of the embodiment 1.

[0112] Embodiment 20 The embodiment provides a non-odor environment-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the non-odor environment-friendly single-component polyurethane waterproof coating and that of the embodiment 1 is that the molecular sieve is 2 parts.

[0113] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, and the preparation method is the same as that of the embodiment 1.

[0114] Embodiment 21 The embodiment provides a non-odor environment-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the non-odor environment-friendly single-component polyurethane waterproof coating and that of the embodiment 1 is that the molecular sieve is 5 parts.

[0115] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, and the preparation method is the same as that of the embodiment 1.

[0116] Embodiment 22 The embodiment provides a non-odor environment-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the non-odor environment-friendly single-component polyurethane waterproof coating and that of the embodiment 1 is that the molecular sieve is 8 parts.

[0117] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, and the preparation method is the same as that of the embodiment 1.

[0118] Embodiment 23 The embodiment provides a non-odor environment-friendly single-component polyurethane waterproof coating, wherein the difference between the raw material composition of the non-odor environment-friendly single-component polyurethane waterproof coating and that of the embodiment 1 is that the same amount of diatomite (manufacturer Hebei Huisun Mining Co., Ltd., mesh number 600 mesh) is used to replace the molecular sieve.

[0119] The embodiment further provides a preparation method of the single-component polyurethane waterproof coating, and the preparation method is the same as that of the embodiment 1.

[0120] Comparative example 1 The comparative example provides a single-component polyurethane waterproof coating, wherein the difference between the embodiment 1 and the single-component polyurethane waterproof coating is that the PTMG2000 is replaced by the DL-2000D in equal amount.

[0121] The comparative example further provides a preparation method of the single-component polyurethane waterproof coating, and the preparation method is the same as that of the embodiment 1.

[0122] Comparative example 2 The comparative example provides a single-component polyurethane waterproof coating, which is different from example 1 in that the molecular sieve in example 1 is removed.

[0123] The comparative example also provides a preparation method of the single-component polyurethane waterproof coating, which is the same as that of example 1.

[0124] Comparative example 3 The comparative example provides a single-component polyurethane waterproof coating, which is different from example 1 in that the octanoyl acetone tin in example 1 is replaced with a conventional organotin catalyst dibutyl tin dilaurate.

[0125] The comparative example also provides a preparation method of the single-component polyurethane waterproof coating, which is the same as that of example 1.

[0126] Comparative example 4 The comparative example provides a single-component polyurethane waterproof coating, which is different from example 1 in that the benzoyl chloride in example 1 is removed.

[0127] Comparative example 5 The comparative example provides a single-component polyurethane waterproof coating, which is different from example 1 in that the amount of PTMG2000 is 65 parts by weight.

[0128] The comparative example also provides a preparation method of the single-component polyurethane waterproof coating, which is the same as that of example 1.

[0129] The single-component polyurethane waterproof coatings prepared in examples 1 to 23 and comparative examples 1 to 5 are tested for performance, the test method is in accordance with the standards of GB / T19250-2013 and GB / T16777-2008, and the test performance is shown in Tables 1 to 3.

[0130] Test method: Construction odor: 200g of the coating sample is scraped on a 30cm*50cm glass plate, then transferred to a closed fume hood for curing, after curing at a temperature of (23±2)℃ and a humidity of (50±10)% for 24h, the fume hood is opened to smell the odor in the air of the fume hood.

[0131] The dry time, dry time, tensile strength, elongation at break, tear strength, adhesion strength, and volatile organic compound content are tested in accordance with GB / T19250-2013.

[0132] The thick coating blister test is tested in accordance with 7.14 in JC / T2435-2018.

[0133] Storage stability test method: After the sample is placed under standard test conditions (23±2℃, relative humidity 50±10%) for 24 hours, the initial viscosity of the sample is measured. Then, the sample is placed in a 50℃ forced-air drying oven for accelerated thermal storage. After the predetermined time, the sample is removed and placed under standard test conditions for 24 hours, and the viscosity after thermal storage is measured. Viscosity increase value = (viscosity after thermal storage - initial viscosity) * 100% / initial viscosity.

[0134] Table 1 Item Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 Viscosity 9300 10100 10800 14800 8100 8900 9000 9200 9700 10300 9200 9350 Viscosity increase value / % (hot storage 30d) 2 3 2 9 3 2 3 2 4 5 2 2 Odor during application No odor No odor No odor No odor No odor No odor No odor No odor No odor No odor No odor No odor Blistering in thick coating (50℃, 80% humidity) No blistering No blistering No blistering No blistering No blistering No blistering No blistering No blistering No blistering No blistering No blistering VOC content / g / L Surface drying time / h 5 5 6 4 4 5 4 6 5 4 5 6 Through drying time / h 3 3 3 4 3 3.5 3 3 3 3 4 5 Tensile strength / Mpa 6 6 6 8 6 7 6 6 5 5 9 10 Elongation at break / % 3.01 3.22 3.07 4.36 3.52 3.13 3.08 2.89 3.09 3.15 2.78 2.51 Tear strength / (N / mm) 778 662 712 871 621 652 579 793 756 713 834 892 Adhesion strength / Mpa 17 19 17 15 18 18 18 17 18 18 16 16 Item 1.20 1.31 1.22 1.64 1.43 1.24 1.21 1.18 1.21 1.23 1.12 1.04 Table 2 Example 13 Example 14 Example 15 Example 16 Example 17 Example 18 Example 19 Example 20 Example 21 Example 22 Example 23 Viscosity Viscosity increase value / % (hot storage 30d) 9200 9700 9310 9000 9500 9400 9300 9430 9600 9800 9100 Odor during application 2 2 2 4 3 2 2 3 5 7 6 No odor No odor No odor No odor No odor No odor No odor No odor No odor No odor No odor Blistering in thick coating (50℃, 80% humidity) No blistering No blistering No blistering No blistering No blistering No blistering No blistering No blistering No blistering No blistering No blistering VOC content / g / L Surface drying time / h 5 5 5 6 5 5 5 4 4 3 8 Through drying time / h 3 3 3 4 3 3 3 3 3 3 3 Tensile strength / Mpa 6 6 6 8 6 6 6 6 6 6 6 Elongation at break / % 3.03 2.33 2.83 2.53 3.15 3.04 2.91 2.86 2.73 2.65 2.93 Tear strength / (N / mm) 758 898 718 875 708 771 793 817 831 846 798 Adhesion strength / Mpa 17 15 17 16 17 17 17 17 17 17 17 Item 1.21 1.08 1.05 1.02 1.26 1.14 1.17 1.15 1.12 1.08 1.16 Table 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Viscosity Viscosity increase value / % (hot storage 30d) 8800 9000 11000 9200 16800 Cured 3 12 Odor during application 38 21 No odor No odor No odor No odor No odor No odor Blistering in thick coating (50℃, 80% humidity) No blistering Slight blistering Slight blistering No blistering No blistering VOC content / g / L 7 13 15 4 3 Surface drying time / h 4 5 4 3.5 3 Through drying time / h 8 9 8 7 6 Tensile strength / Mpa 2.54 2.86 2.95 2.93 4.04 Elongation at break / % 880 723 651 640 467 Tear strength / (N / mm) 12 17 17 17 22 Adhesion strength / Mpa 0.81 1.06 1.02 1.17 1.57 As can be seen from the comparison in the table above, the single-component polyurethane waterproof coatings of Examples 1-23 limit the raw materials and dosages of components such as polyether, PTMG, chain extender, and stabilizer within a specific range, which can produce a synergistic effect. The resulting single-component polyurethane waterproof coatings have no abnormalities in various aspects, low volatile organic compound content / g / L (VOC) value, no odor during construction, no blistering when applied thickly, and no significant change in viscosity increase after heat storage.

[0135] The comparison between Example 1 and Comparative Example 1 shows that replacing PTMG2000 in Example 1 with an equal amount of DL-2000D has a significant impact on tear performance and bond strength, resulting in unsatisfactory tear strength and bond strength. Furthermore, Example 1 performs better in terms of tensile strength, drying time, storage stability (lower viscosity growth rate after 30 days of heat storage), and VOC content.

[0136] The comparison between Example 1 and Comparative Example 2 shows that molecular sieves are crucial for preventing coating blistering, reducing VOCs, improving storage stability, and ensuring excellent mechanical properties. Comparative Example 2, which omitted molecular sieves, exhibited slight blistering during thick coating application and had a relatively high VOC content, indicating that the molecular sieves can absorb carbon dioxide gas released during coating curing. Furthermore, compared to Example 1, Comparative Example 2 showed a viscosity increase of up to 12%, indicating significantly worse storage stability. Comparative Example 2 also had a longer drying time, and key mechanical properties such as tensile strength, elongation at break, and bond strength all decreased to varying degrees.

[0137] From the comparison between Example 1 and Comparative Example 3, it can be seen that, compared with Example 1 using chelated tin catalyst (tin octoate acetylacetone), the storage stability of Comparative Example 3 using conventional organotin catalyst (dibutyltin dilaurate) is very poor, it has completely solidified after 30 days of hot storage, and slight foaming occurs during thick coating. While the viscosity increase rate of Example 1 after hot storage is only 2%, and no foaming occurs during thick coating. This fully shows that the chelated tin catalyst used in the present application is the key to obtain excellent storage stability and good application performance.

[0138] From the comparison between Example 1 and Comparative Example 4, it can be seen that, Comparative Example 4 removes the stabilizer (benzoyl chloride) based on the formulation of Example 1, and the viscosity increase rate after 30 days of hot storage is as high as 38%, which is much higher than 2% of Example 1, and the viscosity increases significantly after hot storage, indicating that the storage stability is significantly decreased. This result proves that the stabilizer in the present application is beneficial to inhibit the viscosity increase of the coating during storage and ensure the long-term storage stability of the product.

[0139] From the comparison between Example 1 and Comparative Example 5, it can be seen that, in Comparative Example 5, the amount of polytetrahydrofuran polyol (PTMG2000) exceeds the range defined in the present application, resulting in too high initial viscosity of the product, reducing the convenience of application; at the same time, the elongation at break of the product also decreases significantly. This shows that controlling the amount of each component within the specific range required by the present application is a necessary condition to achieve a balance between good application performance and excellent mechanical properties of the product.

[0140] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An odorless, environmentally friendly, single-component polyurethane waterproof coating, characterized in that, Its preparation materials do not include latent curing agents, and include the following raw material components: 140-245 parts by weight of polyether polyol; 0.5~1.5 parts by weight of small molecule chain extender; 38-42 parts by weight of diisocyanate; Stabilizer 0.1~0.3 parts by weight; Carbon dioxide absorbent: 1.0~8.0 parts by weight; Catalyst: 0.5~1.0 parts by weight; The catalyst is a chelated tin catalyst; The polyether polyol includes polytetrahydrofuran polyol, and the polytetrahydrofuran polyol is present in a quantity of 20-60 parts by weight.

2. The odorless, environmentally friendly, single-component polyurethane waterproof coating according to claim 1, characterized in that, The chelated tin catalyst includes one or more of tin acetylacetone, tin octanoyl acetylacetone, pentaerythritol tin, trimethylolpropane tin, diethanolamine tin, and triethanolamine tin.

3. The odorless, environmentally friendly, single-component polyurethane waterproof coating according to claim 1 or 2, characterized in that, The stabilizer is one or more of benzoyl chloride, p-toluenesulfonyl chloride, acid anhydride and vinyltrimethoxysilane, preferably benzoyl chloride.

4. The odorless, environmentally friendly, single-component polyurethane waterproof coating according to any one of claims 1-3, characterized in that, The polyether polyol also includes non-polytetrahydrofuran polyols: 75-100 parts by weight of polyether diol and 45-85 parts by weight of polyether triol. Preferably, the polyether diol has a number-average molecular weight of 1000-2000, a functionality of 2, and a hydroxyl value of 56.1-112.2 mgKOH / g; Preferably, the polyether triol has a number-average molecular weight of 1000-5000, a functionality of 3, and a hydroxyl value of 33.66-56.1 mgKOH / g.

5. The odorless, environmentally friendly, single-component polyurethane waterproof coating according to any one of claims 1-4, characterized in that, The polytetrahydrofuran polyol is a polytetrahydrofuran diol; preferably, the number average molecular weight of the polytetrahydrofuran diol is 1000~2000.

6. The odorless, environmentally friendly, single-component polyurethane waterproof coating according to any one of claims 1-5, characterized in that, The small molecule chain extender is selected from one or more of diamine chain extenders or diol chain extenders; the diamine chain extender includes one or more of isophorone diamine, ethylenediamine, dimethylthiotoluene diamine, and diethyltoluene diamine; the diol chain extender includes one or more of 1,4-butanediol, 1,6-hexanediol, diethylene glycol, and 1,4-cyclohexanediol.

7. The odorless, environmentally friendly, single-component polyurethane waterproof coating according to any one of claims 1-6, characterized in that, The raw materials for its preparation also include the following raw material components: 150-260 parts by weight of pigments and fillers; the pigments and fillers are selected from one or more of nano-calcium carbonate, talc powder, fumed silica, heavy calcium carbonate, kaolin, wollastonite powder, mica powder, titanium dioxide and carbon black; And / or, the diisocyanate is selected from one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate; And / or, the carbon dioxide absorbent is selected from one or more of zeolite, activated carbon, calcium oxide, magnesium oxide, molecular sieve, diatomaceous earth, and polystyrene-divinylbenzene resin.

8. The odorless, environmentally friendly, single-component polyurethane waterproof coating according to any one of claims 1-7, characterized in that, Its preparation materials also include the following raw material components: 100-150 parts by weight of plasticizer; Preferably, the plasticizer is selected from one or more of vegetable oil esters, trioctyl phosphate, citrate, tributyl acetylacetate, and chlorinated paraffin plasticizers.

9. The preparation method of the odorless, environmentally friendly, single-component polyurethane waterproof coating according to any one of claims 1-8, characterized in that, Includes the following steps: Polyether polyol, small molecule chain extender and pigments and fillers are mixed to obtain a mixed slurry; Diisocyanate and part of the catalyst are added to the mixed slurry at 70-80°C, the temperature is raised to 75-85°C, and the reaction is carried out for 2-3 hours; then carbon dioxide absorbent is added at 75-85°C, and the reaction is continued with stirring; then the temperature is lowered to 55-65°C, and the remaining catalyst and stabilizer are added.

10. The preparation method of the odorless, environmentally friendly, single-component polyurethane waterproof coating according to claim 9, characterized in that, The mixed slurry is dehydrated before the diisocyanate and part of the catalyst are added; preferably, the dehydration is carried out at a temperature of 100-110°C and a relative vacuum of -0.08--0.1 MPa for 2-3 hours. And / or, after adding the carbon dioxide absorbent, continue stirring the reaction for 0.5 to 1 hour; And / or, after adding the remaining portion of the catalyst and the stabilizer, stir for 0.5 to 1 hour.