Two-component multicomponent blended polyurethane waterproof coating and preparation method thereof

Abstract

The invention discloses a two-component multicomponent blended polyurethane waterproof coating and a preparation method thereof. The polyurethane waterproof coating comprises a component A and a component B, the component A is prepared from the following raw materials: polyether polyol, a plasticizer, a filler, a diluent, isocyanate, a catalyst, a latent curing agent, epoxy resin and other auxiliaries; the component B comprises a curing accelerator, a silane coupling agent and quartz sand. According to the polyurethane waterproof coating disclosed by the invention, through optimization of a formula system, the bonding performance of a waterproof layer and a base layer and the bonding performance of the waterproof layer and an adherend tile are improved, the cohesive strength and tear resistance of the waterproof layer are improved, and the problem of poor tiling stickiness of an existing polyurethane material during facade construction is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of waterproof coatings, and more specifically, relates to a two-component multi-component blended polyurethane waterproof coating and a preparation method thereof. Background Art

[0002] One-component latent curing polyurethane waterproof coating has become a current research hotspot because it has better solved the bubble problem in the storage and curing of one-component moisture curing polyurethane. The reaction principle is that the latent curing agent first reacts with H 2 O reacts, and the hydrolysis product reacts with -NCO to grow the molecular chain and form a cross-linked structure. No CO is generated during the reaction. 2 Gas. However, in order to facilitate the later tiling of tiles, the current single-component latent curing polyurethane waterproof coating will be sanded before the coating surface dries to enhance the adhesion between the tiles and the coating. However, due to the smoothness of the polyurethane coating, poor adhesion to the base layer, and irregular sanding during construction, it is common for tiles to fall off after being attached. That is, the single-component latent curing polyurethane waterproof coating often has the problem of poor adhesion to tiles during facade construction. Summary of the invention

[0003] The purpose of the present invention is to provide a two-component multi-component blended polyurethane waterproof coating and a preparation method thereof. The polyurethane waterproof coating of the present invention improves the bonding performance between the waterproof layer and the base layer, the waterproof layer and the adherend ceramic tile through the optimization of the formula system, improves the cohesive strength and tear resistance of the waterproof layer, and solves the problem of poor tile adhesion of existing polyurethane materials during facade construction.

[0004] In order to achieve the above-mentioned object, 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 the A component include: polyether polyol, plasticizer, filler, diluent, isocyanate, catalyst, latent curing agent, epoxy resin and other additives;

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

[0007] In the present invention, the purpose of adding quartz sand treated with a silane coupling agent is to solve the problem of irregular sand spreading by workers in the current system using polyurethane waterproof coating / ceramic tile paving. The rough and convex granular surface of the polyurethane waterproof coating is conducive to the later hanging of (ceramic) tiles. At the same time, the addition of the epoxy resin component ensures sufficient bonding strength between the lower surface of the polyurethane waterproof coating and the base surface and the intrinsic viscosity of the coating. Therefore, the present invention simultaneously modifies the upper and lower surfaces of the polyurethane coating, and synergistically ensures that the phenomenon of tiles falling off after paving tiles no longer occurs.

[0008] According to the present invention, preferably, the raw materials for preparing the A component include, by weight: 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] Calculated by weight, the B component includes: 0.01-1 parts of a curing accelerator, 0.5-5 parts of a 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 the present 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 of toluene diisocyanate, diphenylmethane diisocyanate, polyphenyl polymethylene polyisocyanate, isophorone diisocyanate, methylcyclohexyl diisocyanate, hexamethylene diisocyanate and xylylene diisocyanate;

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

[0015] The filler is at least one of heavy calcium carbonate, talcum powder 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 aldimines, ketimines and oxazolidines.

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

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

[0021] In the present invention, the reaction principle of the latent curing polyurethane system is as follows: the imine latent curing agent first reacts with H 2 O reacts, and the hydrolysis product reacts with -NCO to grow the molecular chain and form a cross-linked structure. Since the reaction of -NCO and water is reduced during this reaction, the emission of CO is avoided. 2 , thereby reducing the generation of bubbles.

[0022] According to the present invention, preferably, the other auxiliary agents include defoamers, dispersants and anti-settling agents;

[0023] Preferably, in parts by mass, the defoaming agent is 0.2-2, the dispersant is 0.2-2 and the anti-settling agent is 0.2-2.

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

[0025] In the present invention, epoxy resin is added as component A in a single-component latent curing polyurethane system, and the viscosity of the product of component A is ensured to meet the application requirements through reasonable formula design and process route. Phenol salt (2,4,6-tris(dimethylaminomethyl)phenol) is added to component B as a curing agent for the epoxy resin, which increases the density of the cured crosslinking of the epoxy resin while minimizing the reaction effect of the imine latent curing agent and the isocyanate group.

[0026] The curing mechanism of epoxy resin is as follows: aliphatic polyamine is a commonly used room temperature curing agent for epoxy resin, -NH 2 It will promote the epoxy group to open the ring and cross-link into a network structure. However, in the polyurethane formulation system, -NCO and -NH 2 A side reaction will occur to produce substituted urea, and the activity of -NCO is much higher than that of epoxy group. Therefore, the present invention uses phenol salt as a catalyst for epoxy resin, which can avoid the occurrence of side reactions and effectively promote the cross-linking of epoxy resin, thereby improving the bonding strength between the coating and the base layer, as well as the strength of the coating itself.

[0027] According to the present invention, preferably, the silane coupling agent is at least one of epoxysilane, alkylsilane and vinylsilane;

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

[0029] In the present 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 surface to facilitate the subsequent tile laying process.

[0030] In the present invention, preferably, when used, the component A and the component B are mixed at 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 preparation method comprising:

[0032] Preparation of the A component: (1) adding the polyether polyol, plasticizer, epoxy resin, filler and dispersant into a reactor, turning on vacuum and stirring, heating to 100-120° C., and performing vacuum dehydration;

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

[0034] (3) Finally, a latent curing agent and a defoaming agent are added, and after the reaction is continued, vacuum degassing is performed to obtain the A component;

[0035] Preparation of the B component: stir and mix the silane coupling agent and quartz sand, then add the curing accelerator, and continue to stir and mix to obtain the B component.

[0036] According to the present invention, preferably, the preparation of the A component is as follows: (1) adding the polyether polyol, plasticizer, epoxy resin, filler and dispersant into a reactor, turning on vacuum and stirring, heating to 100-120° C., and vacuum dehydrating for 3-5 hours;

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

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

[0039] Preparation of the B component: stir and mix the silane coupling agent and quartz sand, then add the curing accelerator, and continue to stir and mix to obtain the B component.

[0040] In the present invention, the silane coupling agent and quartz sand are firstly stirred and mixed, and the quartz sand is coated with the silane coupling agent, thereby enhancing 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 adherend ceramic tile by optimizing the formula system, improves the cohesive strength and tear resistance of the waterproof layer, and solves the problem of poor adhesion of existing polyurethane materials to tiles during facade construction.

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

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

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

[0046] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0047] The present invention is further described below by examples:

[0048] In the following examples, the polyether diol used was purchased from Bluestar Dongda Company with a brand name of DL2000D and a weight average molecular weight of 3000; the polyether triol was purchased from Bluestar Dongda Company with a brand name of EP330N and a weight average molecular weight of 5000;

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

[0050] The latent curing agent is aldimine, specifically XY401 from Lambovan;

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

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

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

[0054] Diisononyl phthalate belongs to the phthalate plasticizer class;

[0055] The epoxy resin is bisphenol A type epoxy resin, the epoxy value is 0.48-0.54eq / 100g, and the brand is E-51;

[0056] Epoxy silane was purchased from Jiangxi Chenguang Company with the brand name KH-550; vinyl silane was purchased from Jiangxi Chenguang Company with the brand name KH-171;

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

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

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

[0060] Example 1

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

[0062] Polyether diol 20g

[0063] Polyether triol 10g

[0064] Diisononyl phthalate 10g

[0065] Heavy calcium carbonate 40g

[0066] 10g talcum powder

[0067] Carbon black 0.1g

[0068]

[0069] Component B includes:

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

[0071] Epoxysilane 1g

[0072] Quartz sand 5g

[0073] The specific preparation method is as follows:

[0074] Preparation of component A: (1) polyether diol, polyether triol, plasticizer, epoxy resin, filler and dispersant were added into a four-necked bottle in sequence, vacuum was turned on, stirring speed was set to 430 rpm, heating was started, and after heating to 110° C., vacuum dehydration was performed for 3 h;

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

[0076] (3) Finally, add latent curing agent and defoaming agent, continue to react for 30 minutes, vacuum degassing for 20 minutes, and then discharge the material.

[0077] Preparation of component B: After the silane coupling agent and quartz sand are stirred and evenly mixed, a curing accelerator is added, and the material can be discharged after continuing to stir for 5 minutes.

[0078] Example 2

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

[0080]

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

[0082] Example 3

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

[0084]

[0085]

[0086] Component B includes:

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

[0088] Epoxysilane 1g

[0089] Quartz sand 5g

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

[0091] Test Case

[0092] After the component A and component B prepared in each example were fully mixed at a weight ratio of 18:1, the tensile strength, elongation at break, tear strength and bonding strength were tested in accordance with GB / T19250; the specific test results are shown in the table below.

[0093] Table 1

[0094]

[0095]

[0096] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes 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 multi-component blended polyurethane waterproof coating, characterized in that: The polyurethane waterproof coating comprises: component A and component B; The raw materials for preparing the A component include: polyether polyol, plasticizer, filler, diluent, isocyanate, catalyst, latent curing agent, epoxy resin and other additives; The B component includes: a curing accelerator, a silane coupling agent and quartz sand.

2. The polyurethane waterproof coating according to claim 1, wherein: The raw materials for preparing the A component include, by weight: 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; Calculated by weight, the B component includes: 0.01-1 parts of a curing accelerator, 0.5-5 parts of a silane coupling agent and 1-10 parts of quartz sand.

3. The polyurethane waterproof coating according to claim 1 or 2, 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.

4. The polyurethane waterproof coating according to claim 1 or 2, wherein: The isocyanate is at least one of toluene diisocyanate, diphenylmethane diisocyanate, polyphenyl polymethylene polyisocyanate, isophorone diisocyanate, methylcyclohexyl diisocyanate, hexamethylene diisocyanate and xylylene diisocyanate; The plasticizer is at least one of a phthalate plasticizer, a hydrogenated phthalate plasticizer and a chlorinated paraffin; The filler is at least one of heavy calcium carbonate, talcum powder 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 aldimines, ketimines and oxazolidines.

5. The polyurethane waterproof coating according to claim 1 or 2, wherein: The epoxy resin is a bisphenol A epoxy resin, and the epoxy value of the epoxy resin is 0.48 to 0.54 eq / 100 g.

6. The polyurethane waterproof coating according to claim 1 or 2, wherein: The other additives include defoamers, dispersants and anti-settling agents; Preferably, in parts by mass, the defoaming agent is 0.2-2, the dispersant is 0.2-2 and the anti-settling agent is 0.2-2.

7. The polyurethane waterproof coating according to claim 6, wherein: The curing accelerator is 2,4,6-tris(dimethylaminomethyl)phenol.

8. The polyurethane waterproof coating according to claim 1 or 2, wherein: The silane coupling agent is at least one of epoxy silane, alkyl silane and vinyl silane; The particle size of the quartz sand is in the range of 40-70 meshes.

9. The method for preparing the polyurethane waterproof coating according to any one of claims 1 to 8, characterized in that: The preparation method comprises: Preparation of the A component: (1) adding the polyether polyol, plasticizer, epoxy resin, filler and dispersant into a reactor, turning on vacuum and stirring, heating to 100-120° C., and performing vacuum dehydration; (2) Turn off the vacuum, cool down to below 70°C, add diluent, isocyanate and dust suppressant, and then heat up to 80-85°C to react; then cool down to below 50°C, add catalyst and continue the reaction; (3) Finally, a latent curing agent and a defoaming agent are added, and after the reaction is continued, vacuum degassing is performed to obtain the A component; Preparation of the B component: stir and mix the silane coupling agent and quartz sand, then add the curing accelerator, and continue to stir and mix to obtain the B component.

10. The preparation method according to claim 9, wherein: Preparation of the A component: (1) adding the polyether polyol, plasticizer, epoxy resin, filler and dispersant into a reactor, turning on vacuum and stirring, heating to 100-120° C., and vacuum dehydrating for 3-5 hours; (2) Turn off the vacuum, cool down to below 70°C, add diluent, isocyanate and dust suppressant, then heat up to 80-85°C and react for 3-5h; then cool down to below 50°C, add catalyst and continue the reaction for 30-60min; (3) Finally, add a latent curing agent and a defoaming agent, continue the reaction for 30-60 minutes, and then vacuum degas for 20-30 minutes to obtain the A component; Preparation of the B component: stir and mix the silane coupling agent and quartz sand, then add the curing accelerator, and continue to stir and mix to obtain the B component.

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