Two-component polyblended polyurethane waterproof coating and preparation method thereof

Abstract

The application discloses a two-component multi-element blended polyurethane waterproof coating and a preparation method thereof. The polyurethane waterproof coating comprises A component and B component. Raw materials for preparing the A component comprise polyether polyol, plasticizer, filler, diluent, isocyanate, catalyst, latent curing agent, epoxy resin and other auxiliaries. The B component comprises curing accelerator, silane coupling agent and quartz sand. The polyurethane waterproof coating is optimized through a formula system, the adhesion between a waterproof layer and a base layer, the adhesion between the waterproof layer and a ceramic tile to be adhered is improved, the cohesive strength and the tear resistance of the waterproof layer are improved, and the problem of poor adhesion of the existing polyurethane material when the ceramic tile is adhered during facade construction is solved.

Description

Technical Field

[0001] This invention belongs to the field of waterproof coating technology, and more specifically, relates to a two-component multi-element blended polyurethane waterproof coating and its preparation method. Background Technology

[0002] Single-component latent-curing polyurethane waterproof coatings have become a research hotspot because they effectively solve the bubble problem during storage and curing of single-component moisture-curing polyurethanes. The reaction principle involves the latent curing agent first reacting with H2O, and the hydrolysis products then reacting with -NCO to grow molecular chains and form a cross-linked structure. No CO2 gas is produced during the reaction. However, currently, in practice, to facilitate subsequent tile application, sand is often sprinkled on the coating before it dries to enhance adhesion between the tiles and the coating. However, due to the smoothness of the polyurethane coating, poor adhesion to the substrate, and improper sand application, tile detachment is frequently observed after application. In other words, single-component latent-curing polyurethane waterproof coatings often suffer from poor tile adhesion when applied to vertical surfaces. Summary of the Invention

[0003] The purpose of this invention is to provide a two-component, multi-element blended polyurethane waterproof coating and its preparation method. The polyurethane waterproof coating of this invention improves the adhesion performance between the waterproof layer and the substrate, and between the waterproof layer and the tile to be adhered to, through optimization of the formulation system. It also improves the cohesive strength and tear resistance of the waterproof layer, and solves the problem of poor tile adhesion of existing polyurethane materials during vertical construction.

[0004] To achieve the above objectives, one aspect of the present invention provides a two-component, multi-component blended polyurethane waterproof coating, the polyurethane waterproof coating comprising: component A and component B;

[0005] The raw materials for preparing component A include: polyether polyol, plasticizer, filler, diluent, isocyanate, catalyst, latent curing agent, epoxy resin and other additives;

[0006] Component B includes: curing accelerator, silane coupling agent and quartz sand.

[0007] In this invention, the purpose of adding a silane coupling agent to the treated quartz sand is to solve the problem of improper sand spreading by workers in current polyurethane waterproof coating / tile laying systems. The rough, granular surface of the polyurethane waterproof coating is beneficial for subsequent tile adhesion. Simultaneously, the addition of epoxy resin ensures sufficient adhesion strength between the lower surface of the polyurethane waterproof coating and the substrate, as well as the intrinsic tack of the coating. Therefore, this invention's simultaneous modification of both the upper and lower surfaces of the polyurethane coating synergistically ensures that tile detachment after laying no longer occurs.

[0008] According to the present invention, preferably, the raw materials for preparing component A, by weight, include: 20-40 parts of polyether polyol, 10-30 parts of plasticizer, 30-60 parts of filler, 5-10 parts of diluent, 2-8 parts of isocyanate, 0.01-0.1 parts of catalyst, preferably 0.01-0.03 parts, 0.01-0.1 parts of latent curing agent, 5-20 parts of epoxy resin, and 0.6-6 parts of other additives;

[0009] By weight, component B comprises: 0.01-1 parts of curing accelerator, 0.5-5 parts of silane coupling agent, and 1-10 parts of quartz sand.

[0010] According to the present invention, preferably, the polyether polyol is a polyether diol and / or a polyether triol;

[0011] The weight-average molecular weight of the polyether polyol is 2000-5000.

[0012] In this invention, preferably, the polyether polyol is composed of polyether diol and polyether triol, and the mass ratio of the polyether diol to the polyether triol is (1-3):1.

[0013] According to the present invention, preferably, the isocyanate is at least one selected from toluene diisocyanate, diphenylmethane diisocyanate, polyphenylmethylene polyisocyanate, isophorone diisocyanate, methylcyclohexyl diisocyanate, hexamethylene diisocyanate and phenylmethylene diisocyanate.

[0014] The plasticizer is at least one of phthalate plasticizers, hydrogenated phthalate plasticizers, and chlorinated paraffins;

[0015] The filler is at least one of heavy calcium carbonate, talc, and carbon black;

[0016] The diluent is 150# solvent oil;

[0017] The catalyst is dibutyltin dilaurate and / or stannous octoate;

[0018] The latent curing agent is at least one of aldolimides, ketimides, and oxazolidines.

[0019] In this invention, the filler is preferably composed of heavy calcium carbonate, talc powder and carbon black, and the mass ratio of heavy calcium carbonate, talc powder and carbon black is (30-40):10:0.1.

[0020] According to the present invention, preferably, the epoxy resin is a bisphenol A type epoxy resin, and the epoxy value of the epoxy resin is 0.48 to 0.54 eq / 100g.

[0021] In this invention, the reaction principle of the latent curing polyurethane system is as follows: the imine latent curing agent first reacts with H2O, and the hydrolysis product then reacts with -NCO to grow the molecular chain and form a cross-linked structure. Because this reaction process reduces the reaction between -NCO and water, CO2 emission is avoided, thereby reducing bubble generation.

[0022] According to the present invention, preferably, the other additives include defoamers, dispersants, and antisettling agents;

[0023] Preferably, the defoamer, dispersant, and antisettling agent are present in parts by weight of 0.2-2.

[0024] According to the present invention, preferably, the curing accelerator is 2,4,6-tris(dimethylaminomethyl)phenol.

[0025] In this invention, epoxy resin is added as component A to a single-component latent-curing polyurethane system. Through reasonable formulation design and process route, the viscosity of component A is ensured to meet application requirements. Phenol salt (2,4,6-tris(dimethylaminomethyl)phenol) is added to component B as a curing agent for the epoxy resin. This increases the density of the epoxy resin's curing and crosslinking while minimizing the reaction influence between the imine latent curing agent and the isocyanate groups.

[0026] The curing mechanism of epoxy resin is as follows: Aliphatic polyamines are commonly used room-temperature curing agents for epoxy resins, and -NH2 promotes the ring-opening crosslinking of epoxy groups into a network structure. However, in polyurethane formulations, -NCO and -NH2 undergo a side reaction to produce substituted urea, and the activity of -NCO is much higher than that of epoxy groups. Therefore, this invention uses phenol salts as catalysts for epoxy resins, which avoids side reactions and effectively promotes the crosslinking of epoxy resins, thereby improving the adhesion strength between the coating and the substrate, as well as the strength of the coating itself.

[0027] According to the present invention, preferably, the silane coupling agent is at least one selected from epoxy silane, alkyl silane, and vinyl silane;

[0028] The particle size range of the quartz sand is 40-70 mesh.

[0029] In this invention, 40-70 mesh quartz sand coated with a silane coupling agent that does not react with polyurethane is added to component B to construct a granular surface structure on the coating film, which is beneficial for the subsequent tile-laying process.

[0030] In this invention, preferably, when in use, component A and component B are mixed in a weight ratio of (16-20):1.

[0031] Another aspect of the present invention provides a method for preparing the above-mentioned polyurethane waterproof coating, the method comprising:

[0032] Preparation of component A: (1) Add the polyether polyol, plasticizer, epoxy resin, filler and dispersant to the reactor, turn on the vacuum and stir, heat to 100-120℃ and then perform vacuum dehydration;

[0033] (2) Close the vacuum, cool down to below 70°C, add diluent, isocyanate and dust suppressant, then heat up to 80-85°C to carry out the reaction; then cool down to below 50°C, add catalyst and continue the reaction;

[0034] (3) Finally, add latent curing agent and defoamer, continue the reaction, and then degas under vacuum to obtain component A;

[0035] Preparation of component B: The silane coupling agent is stirred and mixed with quartz sand, then the curing accelerator is added, and the mixture is stirred and mixed again to obtain component B.

[0036] According to the present invention, preferably, the preparation of component A is as follows: (1) the polyether polyol, plasticizer, epoxy resin, filler and dispersant are added to the reactor, vacuum is turned on and stirring is started, the temperature is raised to 100-120°C and then vacuum dehydrated for 3-5 hours;

[0037] (2) Close the vacuum, cool down to below 70°C, add diluent, isocyanate and dust suppressant, then heat up to 80-85°C and react for 3-5 hours; then cool down to below 50°C, add catalyst and continue the reaction for 30-60 minutes.

[0038] (3) Finally, add the latent curing agent and defoamer, continue the reaction for 30-60 min, and then vacuum degas for 20-30 min to obtain component A;

[0039] Preparation of component B: The silane coupling agent is stirred and mixed with quartz sand, then the curing accelerator is added, and the mixture is stirred and mixed again to obtain component B.

[0040] In this invention, the silane coupling agent is first stirred and mixed with the quartz sand, and the quartz sand is coated with the silane coupling agent to enhance the compatibility of the quartz sand in the whole system.

[0041] The technical solution of the present invention has the following beneficial effects:

[0042] (1) The polyurethane waterproof coating of the present invention improves the bonding performance between the waterproof layer and the base layer and between the waterproof layer and the tile to be adhered to by optimizing the formulation system, and improves the cohesive strength and tear resistance of the waterproof layer, thus solving the problem of poor tile adhesion of existing polyurethane materials during vertical construction.

[0043] (2) The waterproof coating of the present invention uses a special A and B two-component formulation system, with a single-component latent curing polyurethane system as the main resin skeleton, supplemented by cross-linking modification of epoxy resin to improve adhesion performance, and a curing accelerator with mild catalytic activity is selected for cross-linking of epoxy resin. At the same time, quartz sand coated with silane coupling agent that does not react with the system is added to the system to form a granular surface on the material surface, which solves the problem of poor adhesion of existing polyurethane materials to bricks during vertical construction.

[0044] (3) The two-component multi-element blended polyurethane waterproof material of the present invention comprehensively utilizes the characteristics of polyurethane, epoxy resin, silane coupling agent and quartz sand. In engineering applications, it achieves a comprehensive integration of material physical and mechanical properties, appearance morphology and surface adhesion, and has certain practical value.

[0045] Other features and advantages of the present invention will be described in detail in the following detailed description section. Detailed Implementation

[0046] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0047] The present invention is further illustrated by the following examples:

[0048] In the following examples, the polyether diols used were purchased from Lanxing Dongda Company, with the brand name DL2000D and a weight-average molecular weight of 3000; the polyether triols were purchased from Lanxing Dongda Company, with the brand name EP330N and a weight-average molecular weight of 5000.

[0049] The solvent oil (diluent) is 150# solvent oil;

[0050] The latent curing agent is an aldehyde-imine derivative, specifically Langbowan's XY401;

[0051] The defoamer is a non-silicone polymer defoamer, specifically BYK-054 from BYK Chemicals.

[0052] The dispersant is BYK-24577 from BYK Chemicals;

[0053] The anti-settling agent is BYK-410 from BYK Chemicals;

[0054] Diisononyl phthalate is a phthalate plasticizer;

[0055] The epoxy resin is a bisphenol A type epoxy resin with an epoxy value of 0.48 to 0.54 eq / 100g and a grade of E-51.

[0056] The epoxy silane was purchased from Jiangxi Chenguang Company, with the grade KH-550; the vinyl silane was purchased from Jiangxi Chenguang Company, with the grade KH-171.

[0057] The particle size range of quartz sand is 40-70 mesh;

[0058] The heavy calcium carbonate had a particle size of 800 mesh and was purchased from Jiangxi Guangyuan Company.

[0059] The talc powder has a particle size of 1250 mesh and was purchased from Jiangxi Guangyuan Company.

[0060] Example 1

[0061] The raw materials for preparing component A include:

[0062] 20g of polyether diol

[0063] 10g of polyether triol

[0064] 10g diisononyl phthalate

[0065] 40g of heavy calcium carbonate

[0066] 10g of talcum powder

[0067] 0.1g of carbon black

[0068]

[0069] Component B includes:

[0070] 0.05g of 2,4,6-tris(dimethylaminomethyl)phenol

[0071] 1g of epoxy silane

[0072] 5g of quartz sand

[0073] The specific preparation method is as follows:

[0074] Preparation of component A: (1) Add polyether diol, polyether triol, plasticizer, epoxy resin, filler and dispersant to the four-necked flask of the reaction vessel in sequence, turn on the vacuum, set the stirring speed to 430 rpm, start heating, and after heating to 110°C, dehydrate under vacuum for 3 hours.

[0075] (2) After vacuum dehydration is completed, the vacuum is turned off and the temperature is lowered. When the material temperature drops below 70°C, diluent, isocyanate and dust suppressant are added. The temperature is then raised to 80-85°C and reacted at 80-85°C for 3 hours. The temperature is then lowered to below 50°C, catalyst is added, and the reaction continues for 30 minutes.

[0076] (3) Finally, add the latent curing agent and defoamer, continue the reaction for 30 minutes, then vacuum degas for 20 minutes, and then the material can be discharged.

[0077] Preparation of component B: After the silane coupling agent and quartz sand are mixed evenly, the curing accelerator is added, and the mixture is stirred for another 5 minutes before being discharged.

[0078] Example 2

[0079] The raw materials for preparing component A include:

[0080]

[0081] Component B includes: 0.1g of 2,4,6-tris(dimethylaminomethyl)phenol Vinylsilane 2g 10g of quartz sand The specific preparation method is the same as in Example 1.

[0082] Example 3

[0083] The raw materials for preparing component A include:

[0084]

[0085]

[0086] Component B includes:

[0087] 0.2g of 2,4,6-tris(dimethylaminomethyl)phenol

[0088] 1g of epoxy silane

[0089] 5g of quartz sand

[0090] The specific preparation method is the same as in Example 1.

[0091] Test case

[0092] After thoroughly mixing components A and B prepared in each embodiment at a weight ratio of 18:1, tensile strength, elongation at break, tear strength, and bond strength were tested according to GB / T19250; the specific test results are shown in the table below.

[0093] Table 1

[0094]

[0095]

[0096] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A two-component polyhybrid polyurethane waterproof coating characterized in that, This polyurethane waterproof coating comprises: component A and component B; The raw materials for preparing component A include: polyether polyol, plasticizer, filler, diluent, isocyanate, catalyst, latent curing agent, epoxy resin and other additives; Component B includes: a curing accelerator, a silane coupling agent, and quartz sand; The curing accelerator is 2,4,6-tris(dimethylaminomethyl)phenol; the silane coupling agent is at least one of epoxy silane, alkyl silane and vinyl silane.

2. The polyurethane waterproofing coating according to claim 1, wherein, The raw materials for preparing component A, by mass parts, include: 20-40 parts of polyether polyol, 10-30 parts of plasticizer, 30-60 parts of filler, 5-10 parts of diluent, 2-8 parts of isocyanate, 0.01-0.1 parts of catalyst, 0.01-0.1 parts of latent curing agent, 5-20 parts of epoxy resin, and 0.6-6 parts of other additives; By weight, component B comprises: 0.01-1 parts of curing accelerator, 0.5-5 parts of silane coupling agent, and 1-10 parts of quartz sand.

3. The polyurethane waterproofing coating according to claim 2, wherein, The catalyst is 0.01-0.03 parts.

4. The polyurethane waterproofing coating according to any one of claims 1 to 3, wherein, The polyether polyol is a polyether diol and / or a polyether triol; The weight-average molecular weight of the polyether polyol is 2000-5000.

5. The polyurethane waterproofing coating according to any one of claims 1 to 3, wherein, The isocyanate is at least one selected from toluene diisocyanate, diphenylmethane diisocyanate, polyphenylmethylene polyisocyanate, isophorone diisocyanate, methylcyclohexyl diisocyanate, hexamethylene diisocyanate, and phenylmethylene diisocyanate. The plasticizer is at least one of phthalate plasticizers, hydrogenated phthalate plasticizers, and chlorinated paraffins; The filler is at least one of heavy calcium carbonate, talc, and carbon black; The diluent is 150# solvent oil; The catalyst is dibutyltin dilaurate and / or stannous octoate; The latent curing agent is at least one of aldolimides, ketimides, and oxazolidines.

6. The polyurethane waterproofing coating according to any one of claims 1 to 3, wherein, The epoxy resin is a bisphenol A type epoxy resin, and the epoxy value of the epoxy resin is 0.48~0.54 eq / 100g.

7. The polyurethane waterproofing coating according to any one of claims 1 to 3, wherein, The other additives include defoamers, dispersants, and antisettling agents.

8. The polyurethane waterproofing coating according to claim 7, wherein, The defoamer, dispersant, and antisettling agent are present in parts by weight, comprising 0.2-2 parts by weight.

9. The polyurethane waterproofing coating according to any one of claims 1 to 3, wherein, The particle size range of the quartz sand is 40-70 mesh.

10. The method for preparing the polyurethane waterproof coating according to any one of claims 1-9, characterized in that, The preparation method includes: Preparation of component A: (1) Add the polyether polyol, plasticizer, epoxy resin, filler and dispersant to the reactor, turn on the vacuum and stir, heat to 100-120℃ and then perform vacuum dehydration; (2) Close the vacuum, cool down to below 70°C, add diluent, isocyanate and anti-settling agent, then heat up to 80-85°C to carry out the reaction; then cool down to below 50°C, add catalyst and continue the reaction; (3) Finally, add latent curing agent and defoamer, continue the reaction, and then degas under vacuum to obtain component A; Preparation of component B: The silane coupling agent is stirred and mixed with quartz sand, then the curing accelerator is added, and the mixture is stirred and mixed again to obtain component B.

11. The preparation method according to claim 10, wherein, Preparation of component A: (1) Add the polyether polyol, plasticizer, epoxy resin, filler and dispersant to the reactor, turn on the vacuum and stir, heat to 100-120℃, and then dehydrate under vacuum for 3-5 hours; (2) Close the vacuum, cool down to below 70°C, add diluent, isocyanate and anti-settling agent, then heat up to 80-85°C and react for 3-5 hours; then cool down to below 50°C, add catalyst and continue the reaction for 30-60 minutes. (3) Finally, add the latent curing agent and defoamer, continue the reaction for 30-60 min, and then vacuum degas for 20-30 min to obtain component A; Preparation of component B: The silane coupling agent is stirred and mixed with quartz sand, then the curing accelerator is added, and the mixture is stirred and mixed again to obtain component B.

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