Application of a polyamide wax composition in the preparation of a polyurethane waterproof coating

Abstract

The present invention discloses an application of a polyamide wax composition in the preparation of a polyurethane waterproof coating. The polyamide wax composition comprises polyamide wax and a mixed solvent for dispersing the polyamide wax. The mixed solvent is composed of isopropanol and N-methylpyrrolidone with a feeding mass ratio of 1:1.1-2.3. By mass percentage, the polyamide wax accounts for 30-50%, the isopropanol accounts for 20-30%, and the N-methylpyrrolidone accounts for 25-45%. The application includes: activating the polyamide wax before adding it to the polyurethane waterproof coating. The polyamide wax composition of the present invention can achieve the activation treatment of the polyamide wax through simple low-speed stirring and / or at a lower activation temperature, reducing the requirements for operating equipment when adding the polyamide wax as a thixotropic agent to the polyurethane waterproof coating, reducing energy consumption, saving costs, facilitating the on-site construction and preparation of the waterproof coating, and endowing the polyurethane waterproof coating with excellent thixotropic properties.

Description

[0001] This invention is a divisional application of a Chinese invention patent application with an application date of August 6, 2021, an application number of 2021108999150, and a title of "A Polyamide Wax Composition, Its Preparation Method and Application". Technical Field

[0002] This invention relates to the field of building waterproofing, and specifically to the application of a polyamide wax composition in the preparation of polyurethane waterproof coatings. Background Art

[0003] Currently, thixotropic agents are usually added to polyurethanes on the market to achieve anti-sagging performance, and polyamide wax is a relatively common thixotropic agent among them. Polyamide wax mainly consists of two parts, a non-polar aliphatic hydrocarbon part and a polar amide functional group. The oxygen atom in the amide group has a large electronegativity and is prone to forming hydrogen bonds with the hydrogen atoms in the hydrocarbon group part. Hydrogen bonds can be formed between molecules or within molecules. Intramolecular hydrogen bonds make the molecule curl up, and the whole molecule is basically non-polar to the outside world, making it difficult to establish a three-dimensional network structure, and thus unable to achieve the thixotropic effect; intermolecular hydrogen bonds can form a three-dimensional network structure in the coating system, and the establishment of this structure endows the coating with anti-sagging performance. Under conventional storage conditions, polyamide wax is prone to forming intramolecular hydrogen bonds. Therefore, before use, polyamide wax needs to be subjected to high-speed shearing and high-temperature activation treatment at about 120°C in a solvent to make the polyamide wax fully dispersed into uniformly dispersed molecular individuals in a straightened state, so as to make it more compatible with the polyurethane system, enable most colloids to be effectively dispersed and generate a rheologically activated network structure, thereby providing excellent thixotropic performance and achieving viscosity establishment, sag control, and pigment and filler suspension control. However, the activation treatment methods of high-speed shearing and relatively high temperature require high production equipment, and at the same time, since on-site treatment is also required, the construction difficulty and construction cost are greatly increased. Summary of the Invention

[0004] The purpose of this invention is to overcome one or more deficiencies in the prior art and provide a new application of a polyamide wax composition in the preparation of polyurethane waterproof coatings. This polyamide wax composition can achieve the activation treatment of polyamide wax through simple low-speed stirring and / or at a lower activation temperature, reducing the requirements for operating equipment when adding polyamide wax as a thixotropic agent to polyurethane waterproof coatings, reducing energy consumption, saving costs, facilitating on-site construction for preparing waterproof coatings, and endowing polyurethane waterproof coatings with excellent thixotropic performance.

[0005] To achieve the above purpose, a technical solution adopted by this invention is: a polyamide wax composition, which comprises polyamide wax and a mixed solvent for dispersing polyamide wax, and the mixed solvent consists of isopropyl alcohol and N-methylpyrrolidone.

[0006] According to some preferred aspects of the present invention, the mass ratio of the isopropanol to the N-methylpyrrolidone in the feed is 1:0.5-2.5.

[0007] Further, the mass ratio of the isopropanol to the N-methylpyrrolidone in the feed is 1:1.1-2.3.

[0008] According to some preferred aspects of the present invention, in this composition, by mass percentage, the polyamide wax accounts for 30-50%, the isopropanol accounts for 20-30%, and the N-methylpyrrolidone accounts for 25-45%.

[0009] Another technical solution provided by the present invention: A preparation method of the above-mentioned polyamide wax composition, the preparation method includes: weighing polyamide wax, isopropanol and N-methylpyrrolidone according to the formula, and mixing and dispersing to obtain a polyamide wax composition.

[0010] Another technical solution provided by the present invention: A method for activating polyamide wax, the activation method includes: mixing the components in the above-mentioned polyamide wax composition at a mixing temperature below 60°C and / or a stirring speed below 200 rpm to obtain polyamide wax containing activation.

[0011] According to the present invention, the mixing time can be shortened to 0.5-2 h to achieve the activation of the polyamide wax.

[0012] According to some preferred and specific aspects of the present invention, the mixing temperature is 40-60°C and the stirring speed is 100-200 rpm.

[0013] The polyamide wax composition of the present invention can enable the polyamide wax to be activated at a lower activation temperature and / or stirring speed, which better overcomes the disadvantages in the prior art that a specific high-speed shearing device (the shearing speed needs to reach more than 1500 rpm) and an activation temperature of about 120°C are required, and reduces the construction difficulty and construction cost.

[0014] Another technical solution provided by the present invention: An application of the above-mentioned polyamide wax composition in a polyurethane waterproof coating, the application includes: before adding it to the polyurethane waterproof coating, performing the following operations on the polyamide wax composition: mixing and dispersing at a mixing temperature below 60°C and / or a stirring speed below 200 rpm.

[0015] Another technical solution provided by the present invention: A one-component polyurethane waterproof coating, characterized in that, by mass parts, the raw materials of the one-component polyurethane waterproof coating include: 25-50 parts of polyurethane prepolymer, 0.1-2 parts of the polyamide wax composition described above, 2-5 parts of active diluent, 0.1-0.3 parts of wetting and dispersing agent, 20-30 parts of heavy filler, 10-20 parts of nano-scale filler, 0.1-0.3 parts of dehydrating agent, 0.05-0.2 parts of catalyst, 0.1-0.3 parts of physical defoaming agent, 0.1-0.3 parts of chemical defoaming agent;

[0016] The preparation method of the one-component polyurethane waterproof coating includes:

[0017] Mix the polyamide wax composition containing activated polyamide wax obtained by the activation method described above with the polyurethane prepolymer, then add the remaining raw materials, mix, and defoam to prepare the one-component polyurethane waterproof coating.

[0018] According to some specific aspects of the present invention, the polyurethane prepolymer is prepared by reacting a polyol with a polyisocyanate and then reacting with a chain extender, and the NCO content is controlled to be 2.5-5.0% (mass percentage). That is, the raw materials of the polyurethane prepolymer include: polyol, polyisocyanate and chain extender.

[0019] According to some preferred and specific aspects of the present invention, the polyol is at least two selected from polyether diol, polyester diol, and polyether triol, and specifically can be selected from, for example, polyether diol 2000, polyether diol 1000, polyether 400, etc. According to some preferred and specific aspects of the present invention, the polyisocyanate is one or more combinations selected from toluene diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), modified MDI, dicyclohexylmethane diisocyanate (HMDI), hexamethylene diisocyanate (HDI), lysine diisocyanate (LDI), and specifically, for example, it can be selected from BASF MDI-MI, Wanhua IPDI, BASF modified MDI103C, BASF MDI-50, BASF TDI, etc.

[0020] According to some preferred and specific aspects of the present invention, the chain extender is one or more combinations selected from clearlink 1000 4,4’-bis(sec-butylamino)dicyclohexylmethane, clearlink3000 3,3’-dimethyl-4,4’-bis(sec-butylamino)dicyclohexylmethane, jefflink754, jefflink555, jefflink 7027, jeffamin HK-511.

[0021] According to some specific aspects of the present invention, the active diluent may be zoldineRD20 active diluent from angus company in the United States, Incozol LV active diluent from ICL company in the United Kingdom, or the like.

[0022] According to some specific aspects of the present invention, the wetting and dispersing agent can be at least one of titanate, silane, carboxylic acid and other dispersants, for example, it can be Hangzhou Lin'an additive f108.

[0023] According to some specific aspects of the present invention, the dehydrating agent is at least one of a molecular sieve or an isocyanate small molecule dehydrating agent, specifically, the micro-nano molecular sieve of Luoyang Jianlong, the p-toluenesulfonyl isocyanate small molecule dehydrating agent of BASF of Germany, the calcium oxide of Qunxin Heavy Calcium, etc.

[0024] According to some specific aspects of the present invention, the heavy filler is selected from at least one of titanium dioxide, heavy calcium, kaolin, talc and the like.

[0025] According to some specific aspects of the present invention, the nanoscale filler is selected from gypsum whiskers, fumed silica, nano calcium carbonate, nano aluminum nitride, nano boron nitride, nano aluminum borate, etc., and can be one, two or more.

[0026] According to some specific aspects of the present invention, the catalyst is selected from at least one of dibutyltin dilaurate, stannous octoate, environmentally friendly non-butyltin catalysts, bismuth carboxylate catalysts, zinc cyclohexaneate, pentamethyldipropylenetriamine, tetramethylethylenediamine, and bismorpholine; preferably, a composite catalyst of at least two combinations thereof, and further preferably a combination of at least three.

[0027] According to some specific aspects of the present invention, the physical defoamer can be a polysiloxane defoamer or a silicone defoamer. The specific defoamer can be Deqian Chemical 5500 defoamer or BYK Chemical 066N defoamer. The chemical defoamer can be calcium oxide, magnesium oxide, calcium hydroxide, latent curing agent, etc.

[0028] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0029] The present invention is a corresponding improvement based on the drawbacks that polyamide wax needs to be subjected to high-speed shearing and high-temperature activation treatment at about 120°C when used as a thixotropic agent. In long-term production practice, the inventor of the present invention accidentally discovered that when isopropanol and N-methylpyrrolidone are combined as a mixed solvent to disperse polyamide wax, the conditions for activating polyamide wax can become simpler. Only by using conventional stirring equipment and / or a lower activation temperature (which can be in the range of 40-60°C, and of course a higher temperature is also possible, but the corresponding requirements for energy consumption and equipment will increase) can the activation of polyamide wax be achieved. This reduces the requirements for operating equipment when adding polyamide wax as a thixotropic agent to polyurethane waterproof coatings, reduces energy consumption, saves costs, and is beneficial for on-site construction to prepare waterproof coatings. At the same time, it also endows the polyurethane waterproof coating with the property of improving anti-sagging performance without increasing viscosity. Specifically, it can achieve characteristics such as no sagging on vertical surfaces (no sagging when applying a 1-mm coating at one time) and no sagging at high temperatures (no sagging when applying a 1-mm coating at one time on a base surface at 60°C). The viscosity is moderate, and it can be constructed at low temperatures in winter and high temperatures in summer. Detailed implementation mode

[0030] The following further illustrates the above scheme with specific examples; it should be understood that these examples are used to illustrate the basic principles, main features, and advantages of the present invention, and the present invention is not limited by the scope of the following examples; the implementation conditions adopted in the examples can be further adjusted according to specific requirements, and the implementation conditions not specified are usually those in conventional experiments.

[0031] Unless otherwise specified in the following examples, all raw materials are obtained through commercial purchase or prepared by conventional methods in the art.

[0032] The polyamide wax compositions used in the following examples have all been activated for polyamide wax: 1.25 kg of isopropanol, 1.75 kg of N-methylpyrrolidone, and 2 kg of polyamide wax are mixed and stirred (200 rpm) in a 60°C water bath for 1 h to obtain a polyamide wax composition containing activated polyamide wax.

[0033] Example 1

[0034] In the reactor, add 150kg Dongda polyether diol 2000, 50kg Dongda polyether diol 1000, 50kg Dongda polyether 400 and 2kg chain extender clearlink 1000 4,4' di-sec-butylamino dicyclohexylmethane, slowly heat to 120℃ under stirring, vacuum dehydrate for 2h, and measure the moisture content. Lower the temperature to below 70℃, add 50kg BASF MDI-MI and 30kg BASF modified MDI103c, then control the temperature at 80±2℃, and react for 1.5h with nitrogen protection under stirring, measure the NCO content of the prepolymer, and stop the reaction after reaching the set value (NCO content is 3.3%). Add 5kg polyamide wax composition and mix and disperse for 1h to obtain a polyurethane prepolymer mixture, which is then pumped into a buffer tank.

[0035] 150kg of Suzhou Lida Superfine LD600, 100kg of Hunan Jinjian B-type nanopowder, 0.5kg of Wuxi Zehui Chemical's magnesium oxide and 0.5kg of Jiangsu Qunxin's calcium oxide were dehydrated to a moisture content below 0.05% at 160°C and -0.1MPa by a kneader and then stored in a buffer tank for later use.

[0036] 337kg of polyurethane prepolymer mixture prepared by the above method, about 251kg of dehydrated filler treated by the above method, 20kg of Zoldine RD20 active diluent from Angus Company of the United States, 2kg of defoaming agent 066N from BYK Chemical, 1kg of silane coupling agent WD50 from Hubei Wuda Silicone Company, 0.5kg of dibutyltin dilaurate from Beijing Akma, 0.3kg of pentamethyldipropylenetriamine from Air Chemicals of the United States, 0.2kg of zinc isooctanoate from Leading Chemicals of the United States, 0.5kg of toluenesulfonyl isocyanate small molecule water removing agent from BASF of Germany, are stirred, dispersed, ground and degassed by a twin-screw mixer maintained at below 25°C, with a vacuum degree of -0.09 to 0.1MPa. The fineness is tested by a scraper fineness meter to be above 50um, and then the material can be discharged and filled.

[0037] The coating performance test obtained in Example 1 is as follows:

[0038] The viscosity at low shear rate of 25℃ is 17000mpa.s, the solid content is 98.2%, the surface drying time is 5 hours, the actual drying time is 18 hours, the tensile strength after 7 days is 2.8MPa, the elongation at break is 640%, and the tear strength is 17N / mm.

[0039] The conditions after scraping and coating are as follows: 1mm thick coating at 25℃ does not flow, 1mm thick coating at 60℃ does not flow.

[0040] Example 2

[0041] In the reactor, add 50kg Dongda polyether diol 2000, 80kg Dongda polyether diol 1000, 80kg Dongda polyether 400 and 2kg chain extender clearlink 1000 4,4' di-sec-butylamino dicyclohexylmethane, slowly heat to 120℃ under stirring, vacuum dehydrate for 2h, and measure the moisture content. Lower the temperature to below 60℃, add 70kg BASF MDI-50 and 20kg BASF TDI, then control the temperature at 80±3℃, and react for 1.5h with nitrogen protection under stirring. Determine the NCO content of the prepolymer, and stop the reaction after reaching the set value (NCO content is 3.3%). Add 5kg polyamide wax composition and continue mixing and dispersing for 1h to obtain a polyurethane prepolymer mixture, which is then pumped into a buffer tank.

[0042] 0.5kg of Luoyang Jianlong micro-nano molecular sieve, 1kg of magnesium oxide chemical defoamer, 100kg of Suzhou Lida Superfine LD600, 190kg of Hunan Jinjian B-type nanopowder, and 10kg of gypsum whiskers produced by China University of Mining and Technology were dehydrated to a moisture content below 0.05% by a kneader at 160°C and -0.1MPA vacuum, and then stored in a buffer tank for use.

[0043] 307kg of polyurethane prepolymer mixture prepared by the above method, about 301.5kg of dehydrated filler treated by the above method, 20kg of Zoldine RD20 active diluent from Angus Company of the United States, 2kg of defoaming agent 5500 from Deqian Chemical, 1kgf108 Hangzhou Lin'an additive, 0.5kg of dibutyltin dilaurate from Akma Beijing, 0.5kg of pentamethyldipropylenetriamine from Air Chemicals of the United States, 0.5kg of zinc isooctanoate from Leading Chemical of the United States, 1kg of p-toluenesulfonyl isocyanate small molecule water removing agent from BASF of Germany, are stirred, dispersed, ground and degassed by a twin-screw mixer maintained below 25°C, with a vacuum degree of -0.09 to 0.1MPa, and the fineness is tested by a scraper fineness meter to reach more than 50um, and then the material can be discharged and filled.

[0044] The coating performance test obtained in Example 2 is as follows:

[0045] Viscosity at 25°C is 16100mpa.s, solid content is 98.7%, surface drying time is 6 hours, actual drying time is 19 hours, tensile strength after 7 days is 2.6MPa, elongation at break is 660%, and tear strength is 17.5N / mm.

[0046] The conditions after scraping and coating are as follows: 1.5mm thick coating at 25℃ does not flow, and 1mm thick coating at 60℃ does not flow.

[0047] Example 3

[0048] In the reactor, add 100kg Dongda polyether diol 2000, 20kg Dongda polyether diol 1000, 100kg Dongda polyether 400 and 2kg chain extender clearlink 1000 4,4' di-sec-butylamino dicyclohexylmethane, slowly heat to 120°C under stirring, vacuum dehydrate for 2h, and measure the moisture content. Lower the temperature to below 60°C, add 100kg Wanhua IPDI and 20kg BASF 103C, then control the temperature at 80±3°C, and react for 1.5h with nitrogen protection under stirring. Determine the NCO content of the prepolymer, and stop the reaction after reaching the set value (NCO content is 3.3%). Then add 5kg of polyamide wax composition and continue mixing and dispersing for 1h to obtain a polyurethane prepolymer mixture, which is then poured into a buffer tank.

[0049] 2kg of Luoyang Jianlong micro-nano molecular sieve, 3kg of magnesium oxide chemical defoamer, 200kg of Suzhou Lida Superfine LD600, 200kg of Hunan Jinjian B-type nanopowder, and 5kg of gypsum whiskers produced by China University of Mining and Technology were dehydrated to a moisture content below 0.05% by a kneader at 160°C and -0.1MPA vacuum, and then stored in a buffer tank for use.

[0050] 347kg of polyurethane prepolymer mixture prepared by the above method, about 410kg of dehydrated filler treated by the above method, 50kg of Incozol LV active diluent from ICL Company of the United Kingdom, 1kg of defoaming agent 5500 from Deqian Chemical and 1kg of 066N from BYK Chemical, 3kg of f108 Hangzhou Lin'an additive, 0.5kg of leading organic bismuth in the United States, 0.1kg of pentamethyldipropylenetriamine from Air Chemicals of the United States and 5kg of Deshan PM20L are stirred, dispersed, ground and degassed by a twin-screw mixer maintained below 25°C, with a vacuum degree of -0.09 to 0.1MPa. The fineness is tested by a scraper fineness meter to be above 50um, and then the material can be discharged.

[0051] The coating performance test obtained in Example 3 is as follows:

[0052] Viscosity at 25°C is 35900mpa.s, solid content is 98.9%, surface drying time is 7 hours, actual drying time is 20 hours, tensile strength after 7 days is 2.4MPa, elongation at break is 590%, and tear strength is 16.7N / mm.

[0053] The conditions after scraping and coating are as follows: when the base surface temperature is 25℃, a thick coating of 2mm will not flow; when the base surface temperature is 60℃, a thick coating of 1mm will not flow.

[0054] Comparative Example 1 is a comparative example in which the polyamide wax is directly added without pre-activation treatment based on Example 1 (so that the polyamide wax is dispersed in the later mixing process):

[0055] In the reaction kettle, add 150 kg of Dongda polyether diol 2000, 50 kg of Dongda polyether diol 1000, 50 kg of Dongda polyether 400, and 2 kg of chain extender clearlink 1000 4,4'-bis(sec-butylamino)dicyclohexylmethane. Slowly heat up to 120 °C under stirring, and carry out vacuum dehydration for 2 h to measure the moisture content. Lower the temperature to below 70 °C, add 50 kg of BASF MDI-MI and 30 kg of BASF modified MDI 103c, then control the temperature at 80 ± 2 °C, and carry out the reaction under nitrogen protection with stirring for 1.5 h. Measure the NCO content of the prepolymer. After reaching the set value (NCO content is 3.3%), stop the reaction. Add 2 kg of polyamide wax and a mixed solution of 1.25 kg of isopropanol and 1.75 kg of N-methylpyrrolidone, and mix and disperse for 1 h to obtain a polyurethane prepolymer mixture, which is then pumped into the buffer tank.

[0056] The remaining preparation process is the same as that in Example 1.

[0057] The coating properties were tested as follows:

[0058] Viscosity at 25 °C is 28000 mPa·s, solid content is 98.2%, surface drying time is 5 h, through drying time is 18 h, tensile strength at 7 days is 2.3 MPa, elongation at break is 580%, and tear strength is 16 N / mm.

[0059] The situation after scraping and coating is as follows: At 25 °C, a single thick coating of 1 mm does not flow, and at a base surface temperature of 60 °C, a single thick coating of 1 mm flows. Comparative Example 2 is a comparative example that adjusts the solvent component of the polyamide wax composition based on Example 1:

[0060] Mix 1.25 kg of ethanol and 1.75 kg of N-methylpyrrolidone mixed solution with 2 kg of polyamide wax, and stir (200 rpm) in a 60 °C water bath for 1 h to obtain a pretreated polyamide wax composition.

[0061] In the reaction kettle, add 150 kg of Dongda polyether diol 2000, 50 kg of Dongda polyether diol 1000, 50 kg of Dongda polyether 400, and 2 kg of chain extender clearlink 1000 4,4'-bis(sec-butylamino)dicyclohexylmethane. Slowly heat up to 120 °C under stirring, and carry out vacuum dehydration for 2 h to measure the moisture content. Lower the temperature to below 70 °C, add 50 kg of BASF MDI-MI and 30 kg of BASF modified MDI 103c, then control the temperature at 80 ± 2 °C, and carry out the reaction under nitrogen protection with stirring for 1.5 h. Measure the NCO content of the prepolymer. After reaching the set value (NCO content is 3.3%), stop the reaction. Add the pretreated polyamide wax composition and mix and disperse for 1 h to obtain a polyurethane prepolymer mixture, which is then pumped into the buffer tank.

[0062] The remaining preparation process is the same as that of Example 1.

[0063] The coating properties were tested as follows:

[0064] At 25°C, the viscosity was 33300 mPa·s, the solid content was 98.1%, the surface drying time was 5 hours, the through drying time was 17 hours, the tensile strength after 7 days was 2.4 MPa, the elongation at break was 592%, and the tear strength was 17 N / mm.

[0065] The situation after scraping construction was as follows: At 25°C, a single thick coating of 0.75 mm did not flow, a single thick coating of 1 mm flowed at 25°C, and a single thick coating of 1 mm flowed at a base surface temperature of 60°C.

[0066] Comparative Example 3

[0067] Basically the same as Example 1, the difference was only that: 3 kg of N-methylpyrrolidone was mixed with 2 kg of polyamide wax and stirred (200 rpm) in a 60°C water bath for 1 h to obtain a pretreated polyamide wax composition. Others were the same as Example 1.

[0068] The coating properties were tested as follows:

[0069] At 25°C, the viscosity was 23600 mPa·s, the solid content was 98.2%, the surface drying time was 5 hours, the through drying time was 17 hours, the tensile strength after 7 days was 2.3 MPa, the elongation at break was 623%, and the tear strength was 17 N / mm.

[0070] The situation after scraping construction was as follows: At 25°C, a single thick coating of 1 mm did not flow, and at a base surface temperature of 60°C, a single thick coating of 1 mm flowed.

[0071] Comparative Example 4

[0072] Basically the same as Example 1, the difference was only that: 3 kg of isopropanol was mixed with 2 kg of polyamide wax and stirred (200 rpm) in a 60°C water bath for 1 h to obtain a pretreated polyamide wax composition. Others were the same as Example 1.

[0073] The coating properties were tested as follows:

[0074] At 25°C, the viscosity was 21300 mPa·s, the solid content was 98.1%, the surface drying time was 5 hours, the through drying time was 17 hours, the tensile strength after 7 days was 2.5 MPa, the elongation at break was 598%, and the tear strength was 18 N / mm.

[0075] The situation after scraping construction was as follows: At 25°C, a single thick coating of 1 mm did not flow, and at a base surface temperature of 60°C, a single thick coating of 1 mm flowed.

[0076] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the protection scope of the present invention cannot be limited thereby. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

[0077] The endpoints and any values disclosed in this article are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in this article.

Claims

1. Use of a polyamide wax composition in the preparation of a polyurethane waterproof coating, characterized in that, The polyamide wax composition comprises polyamide wax and a mixed solvent for dispersing the polyamide wax, and the mixed solvent is composed of isopropanol and N-methylpyrrolidone; In the polyamide wax composition, by mass percentage, the polyamide wax accounts for 30%-50%, the isopropanol accounts for 20%-30%, and N-methylpyrrolidone accounts for 25%-45%. The feeding mass ratio of the isopropanol to the N-methylpyrrolidone is 1∶1.1-2.3; The application includes: before adding the polyamide wax composition to the polyurethane waterproof coating, activating the polyamide wax to obtain a polyamide wax composition containing activated polyamide wax.

2. Use of the polyamide wax composition according to claim 1 in the preparation of a polyurethane waterproof coating, characterized in that, The activation method includes: mixing the components in the polyamide wax composition at a mixing temperature below 60°C and / or a stirring speed below 200 rpm to obtain a polyamide wax composition containing activated polyamide wax.

3. Use of the polyamide wax composition according to claim 2 in the preparation of a polyurethane waterproof coating, characterized in that, The mixing time is 0.5-2 h; and / or, the mixing temperature is 40-60°C, and the stirring speed is 100-200 rpm.

4. Use of the polyamide wax composition according to claim 1 in the preparation of a polyurethane waterproof coating, characterized in that, The feeding mass ratio of the isopropanol to the N-methylpyrrolidone is 1∶1.1-1.

4.

5. Use of the polyamide wax composition according to claim 1 in the preparation of a polyurethane waterproof coating, characterized in that, The polyurethane waterproof coating is a one-component polyurethane waterproof coating.

6. Use of the polyamide wax composition according to claim 5 in the preparation of a polyurethane waterproof coating, characterized in that, By mass parts, the raw materials of the one-component polyurethane waterproof coating include: 25-50 parts of polyurethane prepolymer, 0.1-2 parts of the above polyamide wax composition, 2-5 parts of active diluent, 0.1-0.3 parts of wetting and dispersing agent, 20-30 parts of heavy filler, 10-20 parts of nano-scale filler, 0.1-0.3 parts of dehydrating agent, 0.05-0.2 parts of catalyst, 0.1-0.3 parts of physical defoaming agent, and 0.1-0.3 parts of chemical defoaming agent.

7. Use of the polyamide wax composition according to claim 6 in the preparation of a polyurethane waterproof coating, characterized in that, The preparation method of the one-component polyurethane waterproof coating includes: Mixing the polyamide wax composition containing activated polyamide wax with the polyurethane prepolymer, then adding the remaining raw materials, mixing, and defoaming to make a one-component polyurethane waterproof coating.

8. Use of the polyamide wax composition according to claim 6 in the preparation of a polyurethane waterproof coating, characterized in that, The polyurethane prepolymer is made by reacting a polyol with a polyisocyanate and then reacting with a chain extender, and the NCO content is controlled to be 2.5-5.0%.

9. The application of the polyamide wax composition according to claim 8 in the preparation of a polyurethane waterproof coating, characterized in that The polyol is at least two selected from polyether diol, polyester diol, and polyether triol; and / or, The polyisocyanate is one or a combination of more than one selected from toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, modified diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate; and / or, The chain extender is one or a combination of more than one selected from clearlink 1000, clearlink3000, jefflink754, jefflink555, jefflink 7027, jeffamin HK-511; 10. Use of the polyamide wax composition according to claim 6 in the preparation of a polyurethane waterproof coating, characterized in that, The active diluent is Incozol LV active diluent or zoldine RD20 active diluent; The wetting dispersant is at least one selected from titanate dispersants, silane dispersants, and carboxylic acid dispersants; The dehydrating agent is molecular sieve or isocyanate small molecule water scavenger; The heavy filler is at least one selected from titanium dioxide, heavy calcium carbonate, kaolin, and talc powder; The nano-level filler is at least one selected from gypsum whiskers, fumed silica, nano calcium carbonate, nano aluminum nitride, nano boron nitride, and nano aluminum borate; The catalyst is at least one selected from dibutyltin dilaurate, stannous octoate, carboxylic acid bismuth catalysts, zinc naphthenate, pentamethyldipropylenetriamine, tetramethylethylenediamine, and bismorpholine catalysts; The physical defoaming agent is polysiloxane defoaming agent or silicone defoaming agent, and the chemical defoaming agent is a combination of one or more selected from calcium oxide, magnesium oxide, calcium hydroxide, and latent curing agent.

11. Use of the polyamide wax composition according to claim 10 in the preparation of a polyurethane waterproof coating, characterized in that, The catalyst is a combination of at least two selected from dibutyltin dilaurate, stannous octoate, carboxylic acid bismuth catalysts, zinc naphthenate, pentamethyldipropylenetriamine, tetramethylethylenediamine, and bismorpholine catalysts; 12. Use of the polyamide wax composition according to claim 6 in the preparation of a polyurethane waterproof coating, characterized in that, The catalyst consists of dibutyltin dilaurate, pentamethyldipropylenetriamine, and zinc isooctanoate.