High-viscosity polymer coating as well as preparation and use methods thereof

Abstract

The invention relates to a high-viscosity polymer coating and a preparation and use method thereof, and belongs to the field of polymer coatings, the coating comprises the following components: 60-80 parts of polymer resin, 15-25 parts of a waterproof filler, 3-8 parts of a waterproof additive, 5-10 parts of a diluent and 2-6 parts of a curing agent, high-solid-content resin is adopted, the addition of the diluent is reduced, and the mass ratio of a film-forming substance is greater than or equal to 85%; the preparation method comprises the steps of filler modification, raw material mixing, curing and the like. The application method sequentially comprises the steps of base layer cleaning, galling treatment, special prime coat brushing, carcass reinforcing material paving and surface coat brushing. The film forming compactness is improved through formula optimization, the adhesive force of the coating and a base layer is enhanced by combining base layer pretreatment and a matched construction technology, the phenomena of peeling and stripping / hollowing are effectively avoided, and the waterproof coating is excellent in waterproof performance, long in service life and suitable for waterproof engineering in the fields of buildings, building materials and the like.

Description

Technical Field

[0001] This invention relates to the field of polymer coatings technology, specifically to a high-viscosity polymer coating and its preparation and application methods. Background Technology

[0002] High-viscosity polymer coatings are widely used in waterproofing projects for building roofs, basements, kitchens, and bathrooms due to their convenient application and good waterproofing effect. However, existing high-viscosity polymer coatings still have significant drawbacks in practical applications: On the one hand, some coatings add a large amount of diluent to achieve smooth application, resulting in a lower proportion of film-forming substances. After curing, the coating has a loose structure and is prone to peeling over long-term use, affecting the integrity of the waterproofing. On the other hand, the adhesion between the coating and the substrate is insufficient. If the substrate is not properly treated during construction, the waterproof coating may peel off from the substrate, causing blistering and allowing rainwater to seep between the substrate and the coating, damaging the waterproofing system and shortening its service life. Summary of the Invention

[0003] In view of the above situation and to overcome the defects of the prior art, the purpose of the present invention is to provide a high-viscosity polymer coating and its preparation and application method, so as to at least partially solve the problems mentioned in the background art.

[0004] Therefore, the purpose of this invention is to provide a high-viscosity polymer coating and its preparation and application method, which has excellent film quality, strong adhesion, and good waterproof durability.

[0005] To achieve the above objectives, the present invention proposes a high-viscosity polymer coating, comprising, by weight: 60-80 parts of polymer resin, 15-25 parts of water-resistant filler, 3-8 parts of waterproofing agent, 5-10 parts of diluent, and 2-6 parts of curing agent; wherein the polymer resin is a high-solids resin.

[0006] Furthermore, the polymer resin is at least one of epoxy resin and polyurethane resin with a solid content of 90%-98%; the diluent is at least one of acetone and ethyl acetate.

[0007] Furthermore, the water-resistant filler is at least one of talc powder, heavy calcium carbonate, and fumed silica with a particle size of 10-50 μm; the waterproofing agent is at least one of organosilicon waterproofing agent and fluorocarbon waterproofing agent.

[0008] Furthermore, the curing agent is at least one of amine curing agents and isocyanate curing agents, and the molar ratio of the curing agent to the polymer resin is controlled at 1:1.05-1.1.

[0009] Another object of the present invention is to provide a method for preparing a high-viscosity polymer coating, comprising the following steps: (1) Surface modification treatment and drying of water-resistant filler; (2) Mix the polymer resin, modified filler, and waterproofing agent evenly; (3) Add diluent and curing agent and continue stirring to obtain a mixed slurry; (4) Solidify the mixed slurry to obtain the finished product.

[0010] Further, in step (1), the surface modification treatment is carried out by silane coupling agent modification, the amount of coupling agent is 1-3% of the mass of water-resistant filler, the treatment temperature is 80-100℃ and the time is 1-2h; Step (2): Stirring speed 600-900 r / min, time 30-60 min; Step (3): Stirring speed 500-600 r / min, time 20-40 min; Step (4) Use a hot air circulating curing chamber with a curing temperature of 100-150℃, a curing time of 1.5-3h, a heating rate of 5℃ / min and keep the room ventilated.

[0011] Another object of the present invention is to provide a method for using a high-viscosity polymer coating, comprising the following steps: (1) Grind and remove dust from the base layer to remove oil stains and loose impurities, ensuring that the moisture content of the base layer is ≤8%; (2) Apply a special roughening agent to the cleaned base surface to form a rough surface, and cure for 2-4 hours; (3) Apply a special primer that is compatible with the paint, with a thickness of 0.2-0.3 mm, and let it dry at room temperature for 6-8 hours; (4) Lay the reinforcing material on the dried primer surface, press it firmly to ensure that there are no wrinkles or hollow areas; (5) Apply the high-viscosity polymer coating of any one of claims 1-4 to the surface of the reinforcing material, with a coating thickness of 1.5-2.0 mm, and cure at room temperature for 24-48 hours.

[0012] Further, in step (1), when the roughness of the base layer is Ra1.5-3.0μm, the moisture content is ≤8%, and the crack width is ≥0.3mm, it is filled with repair mortar; Step (2) The roughening agent is made of cement, quartz sand and acrylic emulsion in a mass ratio of 1:0.8:0.3. The coating thickness is 0.5-0.8mm, and it is cured for 2-4 hours.

[0013] Further, the primer in step (3) is made of polymer resin, diluent and adhesion promoter in a mass ratio of 7:2:1, with a thickness of 0.2-0.3 mm and dried for 6-8 hours; Step (4) The reinforcing material of the tire body is 100-150g / ㎡ polyester non-woven fabric with an overlap width of 50-80mm; Step (5) The topcoat is applied in two coats. The first coat is 0.8-1.0 mm thick. After drying for 12 hours, the second coat is applied. The total thickness is 1.5-2.0 mm. The coating is cured at room temperature for 24-48 hours.

[0014] Beneficial effects: 1. This invention uses high-solids resin and reduces the addition of diluent. The solid content of the polymer resin is 90%-98%, while the amount of diluent is strictly controlled at 5-10 parts to improve the stability of the mass ratio of film-forming substances in the coating. Combined with the appropriate ratio of curing agent and water-resistant filler, it ensures complete resin cross-linking. After the coating is cured, it forms a continuous and dense cross-linked structure without loose pores. 2. The accompanying application method, through the combination of base cleaning, roughening treatment, application of special primer and laying of reinforcing material, greatly enhances the adhesion between the coating and the base layer, and solves the problems of peeling and hollowing of the waterproof coating from the base layer.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a method for preparing a high-viscosity polymer coating according to an embodiment of the present invention; Figure 2 This is a flowchart illustrating a method for applying a high-viscosity polymer coating according to an embodiment of the present invention. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0018] The following description, in conjunction with the accompanying drawings, illustrates an embodiment of the present invention: a high-viscosity polymer coating and its preparation and application method.

[0019] The high-viscosity polymer coating provided in this embodiment of the invention comprises the following components by weight: Polymer resin: 60-80 parts, selected from at least one of high solids epoxy resin and polyurethane resin, with a solids content of 90%-98%, as the core material for film formation to ensure the density and waterproofness of the coating.

[0020] The solid content of the polymer resin is specified by the specific indicators of epoxy resin and polyurethane resin (epoxy equivalent 180-220g / eq, NCO content 8%-12%) and the compounding ratio. At the same time, the amount of diluent is strictly controlled at 5-10 parts to ensure that the mass ratio of film-forming substances in the coating is stable at ≥85%. Combined with the appropriate ratio of curing agent and water-resistant filler of 8%-40%, and with filler modification and full curing process, the resin cross-linking is ensured to be complete. After the coating is cured, it forms a continuous and dense cross-linked structure without loose pores.

[0021] Water-resistant filler: 15-25 parts, selected from at least one of talc, heavy calcium carbonate, and fumed silica, with a particle size of 10-50μm, to enhance the wear resistance and water resistance of the coating; Waterproofing agent: 3-8 parts, select at least one of silicone waterproofing agent and fluorocarbon waterproofing agent to enhance the waterproofing effect of the coating; Diluent: 5-10 parts, choose at least one of acetone and ethyl acetate, used only to adjust the viscosity for application, reduce the amount used to ensure the proportion of film-forming substance; Curing agent: 2-6 parts, select at least one of amine curing agents and isocyanate curing agents to promote resin cross-linking and curing.

[0022] Secondly, the preparation method of the high-viscosity polymer coating provided in this embodiment of the invention includes the following specific steps: Filler modification treatment: Add water-resistant filler to a reactor, add 1-3% (by weight) of silane coupling agent KH-550, and stir at 300-400 r / min for 1-2 hours at 80-100℃. Then dry at 110-120℃ until the moisture content is ≤1% for later use. The modified filler surface forms active groups, which can form strong chemical bonds with high-solids resins, avoiding coating defects caused by uneven filler dispersion in high-solids systems and enhancing the stability of the film structure.

[0023] Raw material mixing: Add the polymer resin, modified water-resistant filler, and waterproofing agent to the mixing equipment and stir at 600-900 r / min for 30-60 min. Control the mixing temperature at 40-50℃ to ensure that the components are evenly dispersed and avoid agglomeration in the high solids content system, thus laying the foundation for dense film formation.

[0024] Preparation of slurry: Add diluent and curing agent to the above mixture and continue stirring at 500-600 r / min for 20-40 min. During the stirring process, keep the temperature stable at about 40℃ so that the diluent is evenly distributed and only plays a role in viscosity adjustment without affecting the cross-linking polymerization of the film-forming substance.

[0025] Curing and molding: Pour the mixed slurry into the mold or use it directly for construction, and cure it in a hot air circulation curing box at 100-150℃ for 1.5-3 hours. During the curing process, keep the ventilation open and control the heating rate at 5℃ / min to ensure that the residual solvent evaporates fully and the resin crosslinks completely during the film formation process, and finally form a dense, non-porous coating.

[0026] Secondly, the method for using the high-viscosity polymer coating provided in this embodiment of the invention includes the following specific steps: Substrate preparation: Use an angle grinder to grind the substrate to remove laitance, oil, and loose impurities. The roughness should be controlled at Ra1.5-3.0μm. Use a vacuum cleaner to remove dust, ensuring the substrate surface is flat, firm, and has a moisture content ≤8%. If there are cracks in the substrate (width ≥0.3mm), they must be filled with repair mortar and cured until the strength meets the requirements to prevent uneven stress on the coating and peeling due to substrate defects.

[0027] Roughening treatment: Mix cement, quartz sand, and acrylic emulsion in a mass ratio of 1:0.8:0.3 to prepare a special roughening agent. Apply the agent evenly to the substrate surface to a thickness of 0.5-0.8 mm, creating an uneven, rough surface. Cure at room temperature for 2-4 hours until the roughened layer is cured. The roughened surface increases the contact area between the substrate and subsequent coatings, forming a physical interlocking effect and significantly improving adhesion.

[0028] Primer application: Apply a special primer (made from a mixture of polymer resin, thinner, and adhesion promoter in a 7:2:1 mass ratio) to the paint. The thickness should be controlled at 0.2-0.3 mm, and allow it to dry at room temperature for 6-8 hours. The primer has excellent permeability, penetrating into the pores of the substrate to form an anchoring effect. Simultaneously, its surface is compatible with the topcoat, building a bonding bridge between the substrate and the topcoat, further enhancing interlayer adhesion.

[0029] Carcass reinforcement: Lay a 100-150 g / m² polyester nonwoven fabric flat on the dried primer surface, and press it firmly in the same direction with a scraper to ensure complete contact between the nonwoven fabric and the primer, without wrinkles or air pockets. The overlap width should be controlled at 50-80 mm. The carcass reinforcement material can distribute the stress on the coating, improve the tensile strength and crack resistance of the coating, and at the same time enhance the overall bonding between the topcoat and the primer, preventing localized peeling.

[0030] Topcoat application: Apply the high-viscosity polymer coating of this invention in two coats as the topcoat. The first coat is 0.8-1.0 mm thick and dries for 12 hours before applying the second coat. The total thickness should be controlled at 1.5-2.0 mm. Curing should be done at room temperature for 24-48 hours to complete the waterproofing process. This two-coat process avoids uneven curing caused by applying too thick a single coat.

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.

[0032] Example 1 Product formula (parts by weight): 65 parts high solids epoxy resin, 20 parts talc powder, 5 parts silicone waterproofing agent, 8 parts acetone, and 4 parts amine curing agent; Preparation method: (1) Take 20 parts of talc powder, add 0.4 parts of silane coupling agent KH-550, stir at 90℃ for 1.5h, and dry to a moisture content of 0.8%; (2) Add 65 parts of epoxy resin, modified talc powder and 5 parts of organosilicon waterproofing agent to the mixing equipment and stir at 700 r / min for 40 min; (3) Add 8 parts acetone and 4 parts amine curing agent, and continue stirring for 30 minutes; (4) Curing with hot air at 120℃ for 2 hours yields a high-viscosity polymer coating; How to use: (1) The moisture content of the base layer after cleaning is 7%; (2) Apply a special texturing agent and cure for 3 hours; (3) Apply a special primer, 0.25 mm thick, and let it dry for 7 hours; (4) Lay 120g / ㎡ polyester nonwoven fabric; (5) Apply the topcoat in two coats, with a total thickness of 1.8 mm, and cure at room temperature for 36 hours.

[0033] Example 2 Product formulation (parts by weight): 70 parts high solids polyurethane resin, 18 parts heavy calcium carbonate, 6 parts silicone waterproofing agent, 7 parts ethyl acetate, and 3 parts isocyanate curing agent; Preparation method: (1) Take 18 parts of heavy calcium carbonate, add 0.36 parts of silane coupling agent KH-550, stir at 85℃ for 1.2h, and dry to a moisture content of 0.6%; (2) Add 70 parts of polyurethane resin, modified heavy calcium carbonate and 6 parts of organosilicon waterproofing agent to the mixing equipment and stir at 800 r / min for 35 min; (3) Add 7 parts ethyl acetate and 3 parts isocyanate curing agent, and continue stirring for 25 min; (4) Hot air curing at 130℃ for 1.8h yields a high-viscosity polymer coating; Usage method: Same as Example 1.

[0034] Example 3 Product formulation (parts by weight): 75 parts of epoxy resin and polyurethane resin compound (mass ratio 1:1), 22 parts of talc powder and heavy calcium carbonate compound (mass ratio 1:1), 4 parts of organosilicon waterproofing agent, 6 parts of acetone, and 5 parts of amine curing agent. Preparation method: (1) Take 22 parts of composite water-resistant filler, add 0.44 parts of silane coupling agent KH-550, stir at 95℃ for 1.8h, and dry to a moisture content of 0.5%; (2) Add 75 parts of composite resin, modified filler and 4 parts of organosilicon waterproofing agent to the mixing equipment and stir at 850 r / min for 30 min; (3) Add 6 parts acetone and 5 parts amine curing agent, and continue stirring for 35 minutes; (4) Hot air curing at 140℃ for 2.2h yields a high-viscosity polymer coating; Usage method: Same as Example 1.

[0035] Example 4 Product formulation (parts by weight): 60 parts high solids epoxy resin, 15 parts fumed silica, 3 parts organosilicon waterproofing agent, 5 parts ethyl acetate, and 2 parts amine curing agent; Preparation method: (1) Take 15 parts of fumed silica, add 0.15 parts of silane coupling agent KH-550, stir at 80℃ for 1 h, and dry to a moisture content of 0.9%; (2) Add 60 parts of epoxy resin, modified fumed silica and 3 parts of organosilicon waterproofing agent to the mixing equipment and stir at 600 r / min for 60 min; (3) Add 5 parts ethyl acetate and 2 parts amine curing agent, and continue stirring for 20 min; (4) Curing with hot air at 100℃ for 3 hours yields a high-viscosity polymer coating; Usage method: Same as Example 1.

[0036] Comparative Example 1 (Existing conventional coatings and application methods) Product formula (parts by weight): 50 parts ordinary epoxy resin, 20 parts talc powder, 5 parts silicone waterproofing agent, 20 parts acetone, and 4 parts amine curing agent; Preparation method: Directly mix all components, stir at 500 r / min for 30 min, and cure at room temperature; Application method: After simple cleaning of the substrate, apply the paint directly to a thickness of 1.8mm.

[0037] Comparative Example 2 (Formula of this invention + conventional construction method) Product formulation: Same as Example 1; Preparation method: Same as in Example 1; Application method: After simple cleaning of the base layer, without roughening, applying primer, or laying body reinforcement material, apply the topcoat directly.

[0038] Comparative Example 3 (Conventional Formula + Construction Method of this Invention) Product formulation: Same as comparative example 1; Preparation method: Same as Comparative Example 1; Usage method: Same as Example 1.

[0039] Performance testing: The coatings of Examples 1-4 and Comparative Examples 1-3 were subjected to performance tests. The test items and standards are as follows: Adhesion: Tested according to GB / T 5210-2006 "Paints and Varnishes - Pull-off Test". Water resistance: According to GB / T 1733-1993 "Determination of water resistance of paint film", the water absorption rate is tested after immersion in water for 72 hours; Peeling condition: Observe the surface condition after 6 months at room temperature; Peeling / Hollowing Condition: After 30 days of curing following construction, the hollowing rate was tested using the tapping method and evaluated according to GB 50207-2012 "Code for Acceptance of Roofing Engineering Quality".

[0040] The test results are shown in Table 1 below: Table 1

[0041] Result analysis shows that, based on the test results: Examples 1-4, using the formulation and application method of the present invention, all exhibit coating adhesion ≥1.2MPa, 72h water absorption rate ≤3%, with no peeling, no blistering, and no delamination, demonstrating excellent overall performance; among them, Example 3, due to the use of resin compounding and composite filler, has the best adhesion and water resistance.

[0042] Comparative Example 1 used a conventional formula and construction method. Due to the high diluent content, loose film formation, and lack of substrate reinforcement treatment, it resulted in low adhesion, high water absorption, and serious peeling, blistering, and delamination problems.

[0043] Comparative Example 2 used the formula of this invention but did not use the matching construction method. Although the peeling problem was solved, the lack of steps such as roughening and primer to enhance adhesion still resulted in blistering and local peeling.

[0044] Comparative Example 3 used the construction method of the present invention but did not optimize the formula. Although it solved the problems of hollowing and peeling, the film quality was poor due to the high content of diluent in the formula, resulting in slight peeling and poor water resistance.

[0045] In summary, this invention, through the synergistic effect of formula optimization and matching construction technology, can completely solve the problems of peeling, flaking / bubbling of existing high-viscosity polymer coatings, and significantly improve the overall performance of the coatings.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A high-viscosity polymer coating, characterized in that, The product comprises, by weight, 60-80 parts of polymer resin, 15-25 parts of water-resistant filler, 3-8 parts of waterproofing agent, 5-10 parts of diluent, and 2-6 parts of curing agent; wherein the polymer resin is a high-solids resin.

2. The high-viscosity polymer coating according to claim 1, characterized in that, The polymer resin is at least one of epoxy resin and polyurethane resin with a solid content of 90%-98%; the diluent is at least one of acetone and ethyl acetate.

3. The high-viscosity polymer coating according to claim 1, characterized in that, The water-resistant filler is at least one of talc powder, heavy calcium carbonate, and fumed silica with a particle size of 10-50 μm; the waterproofing agent is at least one of organosilicon waterproofing agent and fluorocarbon waterproofing agent.

4. The high-viscosity polymer coating according to claim 1, characterized in that, The curing agent is at least one of amine curing agents and isocyanate curing agents, and the molar ratio of the curing agent to the polymer resin is controlled at 1:1.05-1.1; the mass ratio of the curing agent to the water-resistant filler is 8%-40%.

5. The method for preparing the high-viscosity polymer coating according to any one of claims 1-4, characterized in that, Includes the following steps: (1) Surface modification treatment and drying of water-resistant filler; (2) Mix 60-80 parts of polymer resin, 15-25 parts of water-resistant filler and 3-8 parts of waterproofing agent by weight until homogeneous; (3) Add 5-10 parts of diluent and 2-6 parts of curing agent and continue stirring to obtain a mixed slurry; (4) Solidify the mixed slurry to obtain the finished product; Step (4) The molar ratio of curing agent to polymer resin is controlled at 1:1.05-1.1, and the mass ratio of curing agent to water-resistant filler is 8%-40%.

6. The method for preparing the high-viscosity polymer coating according to claim 5, characterized in that, Step (1) Surface modification treatment uses silane coupling agent modification, the amount of coupling agent is 1-3% of the mass of water-resistant filler, the treatment temperature is 80-100℃ and the time is 1-2h; Step (2): Stirring speed 600-900 r / min, time 30-60 min; Step (3): Stirring speed 500-600 r / min, time 20-40 min; Step (4) Use a hot air circulating curing chamber with a curing temperature of 100-150℃, a curing time of 1.5-3h, a heating rate of 5℃ / min and keep the room ventilated.

7. A method for applying a high-viscosity polymer coating, characterized in that, The use of the high-viscosity polymer coating according to any one of claims 1-4 includes the following steps: (1) Grind and remove dust from the base layer to remove oil stains and loose impurities, ensuring that the moisture content of the base layer is ≤8%; (2) Apply a special roughening agent to the cleaned base surface to form a rough surface, and cure for 2-4 hours; (3) Apply a special primer that is compatible with the paint, with a thickness of 0.2-0.3 mm, and let it dry at room temperature for 6-8 hours; (4) Lay the reinforcing material on the dried primer surface, press it firmly to ensure that there are no wrinkles or hollow areas; (5) Apply the high-viscosity polymer coating of any one of claims 1-4 to the surface of the reinforcing material, with a coating thickness of 1.5-2.0 mm, and cure at room temperature for 24-48 hours.

8. The method of using the high-viscosity polymer coating according to claim 7, characterized in that, Step (1) When the roughness of the base layer is Ra1.5-3.0μm, the moisture content is ≤8%, and the crack width is ≥0.3mm, it is filled with repair mortar; Step (2) The roughening agent is made of cement, quartz sand and acrylic emulsion in a mass ratio of 1:0.8:0.

3. The coating thickness is 0.5-0.8mm, and it is cured for 2-4 hours.

9. The method of using the high-viscosity polymer coating according to claim 7, characterized in that, Step (3) The primer is made of polymer resin, diluent and adhesion promoter in a mass ratio of 7:2:1, with a thickness of 0.2-0.3 mm, and is dried for 6-8 hours; Step (4) The reinforcing material of the tire body is 100-150g / ㎡ polyester non-woven fabric with an overlap width of 50-80mm; Step (5) The topcoat is applied in two coats. The first coat is 0.8-1.0 mm thick. After drying for 12 hours, the second coat is applied. The total thickness is 1.5-2.0 mm. The coating is cured at room temperature for 24-48 hours.

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