Highly viscous water-based non-curing waterproof coating and preparation method thereof

Abstract

The application relates to the technical field of paint, and particularly discloses a high-viscosity water-based non-cured waterproof paint and a preparation method thereof. The high-viscosity water-based non-cured waterproof paint comprises the following raw materials in parts by weight: emulsified asphalt 30-50 parts, chloroprene latex 15-20 parts, heavy calcium carbonate 20-30 parts, a composite thickening agent 0.5-1.0 parts, a plasticizer 16-20 parts and a polyether modified silicon defoaming agent 0.2-0.4 parts; and the composite thickening agent is a mixture of a polyurethane thickening agent and an alkali swelling thickening agent. The water-based non-cured waterproof paint obtained by the application only has a trace of flow hanging when performing facade spraying, the elongation is only 28-42 mm, the comprehensive performance is high, and the bonding strength on dry and wet base surfaces is the highest and reaches 1.03 MPa and 0.91 MPa respectively, so that the viscosity of the water-based non-cured waterproof paint is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of paint, in particular to a high-viscosity water-based non-curing waterproof paint and a preparation method thereof. BACKGROUND

[0002] The water-based non-curing waterproof paint is obtained by improving the hot-melt non-curing waterproof paint which must be heated for construction, and is directly sprayed for construction. The water-based non-curing waterproof paint is non-toxic, odorless, safe and environmentally friendly in construction, and is widely applied to non-exposed waterproof engineering of buildings or structures such as subways, tunnels, culverts, dams, pools, roads and bridges, toilets, underground engineering and the like, and can also be applied to waterproofing and lining of subways, tunnels and basements and non-exposed roof waterproofing maintenance engineering. However, the viscosity of the water-based non-curing waterproof paint is low, and the aging resistance and service life of the non-curing waterproof paint are low.

[0003] In the related art, in order to improve the viscosity of the non-curing waterproof paint, emulsified asphalt is used as the main raw material, and tackifying resin emulsion is added to the waterproof paint raw material. However, the viscosity of the obtained waterproof paint is low, which cannot meet the actual use requirements, and the demulsification time of the waterproof paint is long, and the dehydration is slow, which directly leads to a long formation time of the coating, and the waterproof paint is only suitable for horizontal surfaces, and the spraying in the horizontal surface is prone to sagging. SUMMARY

[0004] In order to improve the viscosity of the water-based non-curing waterproof paint on the basis of preventing sagging, the application provides a high-viscosity water-based non-curing waterproof paint and a preparation method thereof.

[0005] In the first aspect, the application provides a high-viscosity water-based non-curing waterproof paint, which adopts the following technical scheme:

[0006] The high-viscosity water-based non-curing waterproof paint comprises the following raw materials in parts by weight: emulsified asphalt 30-50 parts, chlorobutyl latex 15-20 parts, heavy calcium carbonate 20-30 parts, composite thickening agent 0.5-1.0 parts, plasticizer 16-20 parts and polyether modified silicone defoaming agent 0.2-0.4 parts; and the composite thickening agent is a mixture of polyurethane thickening agent and alkali swelling thickening agent.

[0007] The non-curing waterproof paint raw material of the application can be selected from emulsified asphalt 30-50 parts, chlorobutyl latex 15-20 parts, heavy calcium carbonate 20-30 parts, composite thickening agent 0.5-1.0 parts, plasticizer 16-20 parts and polyether modified silicone defoaming agent 0.2-0.4 parts, any value within the respective ranges can be selected, and the viscosity of the non-curing waterproof paint can be improved.

[0008] By adopting the technical scheme, the composite thickening agent is a mixture of polyurethane thickening agent and alkali-swellable thickening agent, the polyurethane thickening agent is a hydrophobic group modified ethoxylated polyurethane water-soluble polymer, belongs to a non-ionic associated thickening agent, can give the thickened coating good film thickness and paint film gloss, and has good high-shear viscosity thickening effect. The alkali-swellable thickening agent has good thickening stability, is used for coating thickening, can give the coating good viscosity and film-forming property, has good coating film fullness and leveling property, and has good anti-splashing effect; the two are used in combination, and the viscosity of the water-based non-cured waterproof coating can be further improved.

[0009] The emulsified asphalt is a viscous asphalt dispersed in water in the form of microdroplets by heat melting and mechanical action, forms an oil-in-water asphalt emulsion, has high waterproof capacity, does not flow in summer and does not crack in winter, and has good elastic-plasticity, which is beneficial to improve the vehicle speed and reduce the fuel consumption. The neoprene latex is a synthetic polymer material with good weather resistance, chemical resistance and heat resistance, has good elasticity, and can effectively prevent water seepage of buildings. The heavy calcium carbonate can play a thickening and filling effect, and can improve the strength, water resistance, dryness and abrasion resistance of the coating. The plasticizer has the effects of enhancing the performance of the coating and improving the waterproof effect, can increase the adhesion of the waterproof coating to the base material, improve the adhesion of the coating, increase the flexibility and elasticity of the coating, improve the wear resistance of the coating, and reduce the permeability of the coating film, thereby improving the waterproof property of the coating film.

[0010] As preferred: the high-viscosity water-based non-cured waterproof coating includes the following raw materials in parts by weight: emulsified asphalt 35-45 parts, neoprene latex 16-18 parts, heavy calcium carbonate 24-28 parts, composite thickening agent 0.6-0.8 parts, plasticizer 17-19 parts, and polyether modified silicone defoamer 0.25-0.35 parts.

[0011] As preferred: the mass ratio of the alkali-swellable thickening agent to the polyurethane thickening agent is 1:(1-3).

[0012] By adopting the technical scheme, the mass ratio of the alkali-swellable thickening agent to the polyurethane thickening agent is adjusted, and the improvement effect of the composite thickening agent on the viscosity can be further improved.

[0013] As preferred: the emulsified asphalt is prepared by modifying a silane coupling agent, and specifically:

[0014] The emulsified asphalt is stirred to add the foaming agent and the silane coupling agent at 145-150 DEG C, the temperature is increased to 190-200 DEG C to continue stirring, the reaction is ended, the temperature is decreased to 50-80 DEG C, the defoaming agent and the alkyl phthalic acid amide are added, stirring, cooling, to obtain the modified emulsified asphalt.

[0015] By using the above technical scheme, the emulsified asphalt is modified by the silane coupling agent, the stability of the emulsified asphalt is improved, the adhesion of the emulsified asphalt and other raw materials is enhanced, thereby further improving the viscosity of the emulsified asphalt, the alkyl phthalic acid amide is added at the same time when the defoaming agent is added, the existing modified structure is prevented from being damaged, the modification effect of the emulsified asphalt modified by the silane coupling agent is ensured, thereby improving the viscosity of the non-curing waterproof coating.

[0016] Preferably, the mass ratio of the silane coupling agent to the emulsified asphalt is 1:(16-20).

[0017] By using the above technical scheme, the mass ratio of the silane coupling agent to the emulsified asphalt is adjusted, the modification effect of the silane coupling agent on the emulsified asphalt is further improved.

[0018] Preferably, the high-viscosity water-based non-curing waterproof coating further comprises the following raw materials in weight parts: 10-15 parts of hydrogenated C5 petroleum resin and 13-15 parts of paraffin wax.

[0019] By using the above technical scheme, the hydrogenated C5 petroleum resin has low acid value, good miscibility, resistance to water, ethanol and chemicals, chemical stability to acid and alkali, good viscosity adjustment and thermal stability, the addition of the hydrogenated C5 petroleum resin can further improve the viscosity of the water-based non-curing coating, and the subsequent addition of the paraffin wax can improve the stability of the hydrogenated C5 petroleum resin in the non-curing coating.

[0020] Preferably, the mass ratio of the hydrogenated C5 petroleum resin to the paraffin wax is 1:(1-1.3).

[0021] By using the above technical scheme, the mass ratio of the hydrogenated C5 petroleum resin to the paraffin wax is adjusted, the stability of the hydrogenated C5 petroleum resin in the non-curing coating is further improved.

[0022] In the second aspect, the application provides a preparation method of a high-viscosity water-based non-curing waterproof coating, which uses the following technical scheme:

[0023] The preparation method of the high-viscosity water-based non-curing waterproof coating comprises the following steps:

[0024] The emulsified asphalt and the chloroprene rubber latex are mixed and stirred uniformly, the composite thickening agent, the plasticizer and the polyether modified silicone defoaming agent are added and mixed, the remaining raw materials are added and mixed, and stirring is performed uniformly to obtain the high-viscosity water-based non-curing waterproof coating.

[0025] In summary, the present application has the following beneficial effects:

[0026] (1) The present application controls the types and amounts of raw materials to make the adhesion strength of the water-based non-curing waterproof coating on dry and wet substrates 0.90-0.92 MPa and 0.80-0.81 MPa, respectively, thereby improving the viscosity of the water-based non-curing waterproof coating.

[0027] (2) The present application controls the mass ratio of silane coupling agent to emulsified asphalt when preparing the modified emulsified asphalt to make the adhesion strength of the water-based non-curing waterproof coating on dry and wet substrates 0.95-0.98 MPa and 0.84-0.86 MPa, respectively, thereby further improving the viscosity of the water-based non-curing waterproof coating.

[0028] (3) The present application adds hydrogenated C5 petroleum resin and paraffin wax to the raw materials and controls the mass ratio of the two to make the adhesion strength of the water-based non-curing waterproof coating on dry and wet substrates 1.02-1.03 MPa and 0.89-0.91 MPa, respectively, thereby further improving the viscosity of the water-based non-curing waterproof coating. DETAILED DESCRIPTION

[0029] The present application will be further described below in conjunction with examples.

[0030] The following raw materials in the present application are commercially available products, which are disclosed to make the raw materials of the present application fully public, and should not be understood as limiting the source of the raw materials. Specifically, the emulsified asphalt is brand Hongche, the effective substance content is ≥50%, and the model is RHLW1-2; the neoprene latex has an effective ingredient content of 79%; the heavy calcium carbonate has a particle size of 400 mesh; the plasticizer is DOP plasticizer, and the effective substance content is 99.5%; the polyether modified silicon defoaming agent is purchased from Yantai Hengxin Chemical Technology Co., Ltd., and the model is THIX-299; the polyurethane thickening agent has a solid content of 17.5%, and the model is PU-16; the alkali swelling thickening agent has a purity of 99.9% and an effective ingredient content of 99%, and the model is E935 thickening agent; the foaming agent is sodium bicarbonate; the silane coupling agent has a model of KH-450; the defoaming agent is dimethyl silicone oil; the alkyl phthalic acid amide has a solid content of 98%, and the model is TAB-2; the hydrogenated C5 petroleum resin has an effective substance content of 98%; and the paraffin wax has a viscosity of 98.

[0031] The following is a preparation example of modified emulsified asphalt

[0032] Preparation Example 1

[0033] A modified emulsified asphalt is prepared by the following operation steps:

[0034] 1 kg of emulsified asphalt was stirred at 150℃, 40 g of foaming agent and 66.66 g of silane coupling agent were added dropwise, the temperature was raised to 195℃ and stirring was continued, the reaction was completed, the temperature was lowered to 65℃, 40 g of defoaming agent and 20 g of alkyl phthalic acid amide were added, stirring was carried out, and the temperature was lowered to room temperature to obtain modified emulsified asphalt.

[0035] Preparation Example 2-5

[0036] The modified emulsified asphalt of Preparation Example 2-5 has the same preparation process as Preparation Example 1, except that the amount of silane coupling agent is 62.5 g, 55.55 g, 50 g and 45.45 g respectively, and the rest of the operation is the same as Preparation Example 1.

[0037] Example 1

[0038] The high-viscosity water-based non-curing waterproof coating of Example 1 is prepared by the following operation steps:

[0039] The emulsified asphalt and chloroprene latex are mixed and stirred uniformly, the composite thickening agent, plasticizer and polyether modified silicone defoaming agent are added and mixed, the remaining raw materials are added and mixed, and stirring is carried out uniformly to obtain the high-viscosity water-based non-curing waterproof coating.

[0040] Example 2-3

[0041] The high-viscosity water-based non-curing waterproof coating of Example 2-3 has the same preparation method as Example 1, except that the amounts of various raw materials are different, which are shown in Table 1 in detail.

[0042] Table 1 Amounts of various raw materials for the high-viscosity water-based non-curing waterproof coating of Examples 1-3 (unit: kg)

[0043]

[0044] Example 4-7

[0045] The high-viscosity water-based non-curing waterproof coating of Example 4-7 has the same preparation process as Example 2, except that the amounts of various raw materials are different, which are shown in Table 2 in detail.

[0046] Table 2 Amounts of various raw materials for the high-viscosity water-based non-curing waterproof coating of Examples 4-7 (unit: kg)

[0047]

[0048] Example 8-12

[0049] The high-viscosity water-based non-curing waterproof coating of Example 8-12 has the same preparation process as Example 5, except that the emulsified asphalt in the raw materials is replaced by an equal amount of modified emulsified asphalt, and the modified emulsified asphalt is selected from the modified emulsified asphalt prepared in Preparation Examples 1-5, and the types and amounts of the remaining raw materials are the same as those of Example 5.

[0050] Examples 13-17

[0051] Examples 13-17 are prepared in the same way as Example 10, except that the raw materials further include hydrogenated C5 petroleum resin and paraffin wax, and the specific amounts are shown in Table 3.

[0052] Table 3: Amounts of raw materials for high-stick water-based non-curing waterproof coating of Examples 13-17 (unit: kg)

[0053]

[0054]

[0055] Comparative Example 1

[0056] The high-stick water-based non-curing waterproof coating of Comparative Example 1 is prepared in the same way as Example 1, except that the polyurethane thickener in the raw materials is replaced by an alkali-swellable thickener, and the amounts of the other raw materials are the same as in Example 1.

[0057] Comparative Example 2

[0058] The high-stick water-based non-curing waterproof coating of Comparative Example 2 is prepared in the same way as Example 1, except that the alkali-swellable thickener in the raw materials is replaced by a polyurethane thickener, and the amounts of the other raw materials are the same as in Example 1.

[0059] Comparative Example 3

[0060] The high-stick water-based non-curing waterproof coating of Comparative Example 3 is prepared in the same way as Example 1, except that no neoprene latex is added to the raw materials, and the amounts of the other raw materials are the same as in Example 1.

[0061] Comparative Example 4

[0062] The high-stick water-based non-curing waterproof coating of Comparative Example 4 is prepared in the same way as Example 1, except that no heavy calcium carbonate is added to the raw materials, and the amounts of the other raw materials are the same as in Example 1.

[0063] Performance testing

[0064] The high-stick water-based non-curing waterproof coatings obtained in Examples 1-17 and Comparative Examples 1-4 are tested for performance using the following standards or methods, and the results are shown in Table 4.

[0065] Adhesion strength: the water-based non-curing coating is sprayed on the surface of the cement mortar, the coating area is 100*50mm, the thickness is 2±0.2mm, and the adhesion strength between the waterproof coating and the cement mortar is detected by a waterproof coating adhesion tester after curing. There are two kinds of dry base surface and wet base surface.

[0066] Facade spraying flow hanging: observed by naked eye.

[0067] Extensibility: two aluminum plates are butt jointed to form a whole, the gap between the two aluminum plates is not greater than 0.05mm, then the water-based non-curing waterproof coating is sprayed on the aluminum plate, the thickness is 2±0.2mm, and the specimen is maintained in the center of the clamp of the tensile testing machine under standard conditions for 24h; the tensile speed is recorded as 10mm / min, the specimen is stretched until the crack opens from the edge of the specimen or shrinks to 10mm, the extension scale pointer value L1 is recorded, and the extension L is calculated as L1-L0.

[0068] Table 4 Performance detection results of different high-viscosity water-based non-curing waterproof coatings

[0069]

[0070]

[0071] The detection results in Table 4 show that the water-based non-curing waterproof coating obtained in the application has the highest adhesion strength of 1.03MPa and 0.91MPa on the dry base surface and the wet base surface, respectively, which improves the viscosity of the water-based non-curing waterproof coating; and only a small amount of flow hanging occurs when the facade is sprayed; the extensibility is only 28-42mm, which has high comprehensive performance.

[0072] From Examples 1-3, the adhesion strength of the water-based non-curing waterproof coating obtained in Example 2 on the dry base surface and the wet base surface is 0.88MPa and 0.79MPa, respectively, which is higher than that of Examples 1 and 3, indicating that the amount of the composite thickening agent in the raw material of the water-based non-curing waterproof coating of Example 2 is more appropriate, which improves the viscosity of the water-based non-curing waterproof coating. It may be related to the fact that the composite thickening agent is a mixture of polyurethane thickening agent and alkali-swellable thickening agent. The polyurethane thickening agent is a hydrophobic group modified ethoxylated polyurethane water-soluble polymer, which belongs to a non-ionic associated thickening agent, and can give the thickened coating good film thickness and gloss. The high shear viscosity thickening effect is good. The thickening stability of the alkali-swellable thickening agent is good, which can give the coating good viscosity and film-forming property, good coating film fullness, good leveling property, and good anti-splashing effect; the combination of the two can further improve the viscosity of the water-based non-curing waterproof coating.

[0073] In combination with Example 2 and Examples 4-7, the adhesion strengths of the water-based non-curing waterproof coating obtained in Examples 4-6 on dry and wet substrates are 0.90-0.92 MPa and 0.80-0.81 MPa, respectively, which are higher than those in Example 2 and Example 7, indicating that when the mass ratio of the alkali-swellable thickening agent to the polyurethane thickening agent is 1:(1-3), the viscosity of the water-based non-curing waterproof coating is improved. It is possible that the composite thickening agent is a mixture of the polyurethane thickening agent and the alkali-swellable thickening agent, the polyurethane thickening agent is a hydrophobic group modified ethoxylated polyurethane water-soluble polymer, which belongs to a non-ionic associated thickening agent, and can give the thickened coating a good film thickness and gloss, and has a good high-shear viscosity thickening effect. The alkali-swellable thickening agent has good thickening stability, and can be used for thickening the coating to give the coating good viscosity and film-forming property, good coating film fullness, good leveling property, and good anti-splashing effect; the combination of the two can further improve the viscosity of the water-based non-curing waterproof coating.

[0074] In Examples 8-12, the adhesion strengths of the water-based non-curing waterproof coating obtained in Examples 9-11 on dry and wet substrates are 0.95-0.98 MPa and 0.84-0.86 MPa, respectively, which are higher than those in Example 8 and Example 12, indicating that when the mass ratio of the silane coupling agent to the emulsified asphalt is controlled to be 1:(16-20), the viscosity of the water-based non-curing waterproof coating is improved. It is possible that adjusting the mass ratio of the alkali-swellable thickening agent to the polyurethane thickening agent can further improve the viscosity improvement effect of the composite thickening agent.

[0075] In combination with Examples 13-17, the adhesion strengths of the water-based non-curing waterproof coating obtained in Examples 14-16 on dry and wet substrates are 1.02-1.03 MPa and 0.89-0.91 MPa, respectively, which are higher than those in Example 13 and Example 17, indicating that when the mass ratio of the hydrogenated C5 petroleum resin to the paraffin is 1:(1-1.3), the viscosity of the water-based non-curing waterproof coating is improved. It is possible that the hydrogenated C5 petroleum resin has low acid value, good miscibility, resistance to water, ethanol and chemicals, chemical stability to acid and alkali, and good viscosity adjustment and thermal stability, and the addition of the hydrogenated C5 petroleum resin can further improve the viscosity of the water-based non-curing coating, and the subsequent addition of the paraffin can improve the stability of the hydrogenated C5 petroleum resin in the non-curing coating.

[0076] It is found from the performance detection data of the water-based non-curing waterproof coating in Example 1 and Comparative Examples 1-4 that the addition of the polyurethane thickening agent, the alkali-swellable thickening agent, the chloroprene latex and the heavy calcium carbonate in the raw materials of the water-based non-curing waterproof coating can improve the viscosity of the water-based non-curing waterproof coating to different extents.

[0077] The embodiments are only illustrative of the present application, and are not intended to limit the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A high-viscosity, water-based, non-curing waterproof coating, characterized in that, The raw materials include the following parts by weight: 30-50 parts emulsified asphalt, 15-20 parts chloroprene latex, 20-30 parts heavy calcium carbonate, 0.5-1.0 parts composite thickener, 16-20 parts plasticizer, 10-15 parts hydrogenated C5 petroleum resin, 13-15 parts paraffin wax, and 0.2-0.4 parts polyether-modified silicone defoamer; the composite thickener is a mixture of polyurethane thickener and alkali-swellable thickener; the mass ratio of alkali-swellable thickener to polyurethane thickener is 1:(1-3); the mass ratio of hydrogenated C5 petroleum resin to paraffin wax is 1:(1-1.3). The emulsified asphalt is prepared by modification with a silane coupling agent, specifically: Emulsified asphalt was stirred and added dropwise with a foaming agent and a silane coupling agent at 145-155℃. The temperature was raised to 190-200℃ and stirring was continued until the reaction was complete. The temperature was then lowered to 50-80℃, and a defoamer and an alkyl phthalate amide were added. The mixture was stirred and cooled to obtain modified emulsified asphalt. The mass ratio of the silane coupling agent to the emulsified asphalt was 1:(16-20). The foaming agent is used in an amount of 3-5% of the emulsified asphalt; the defoamer is used in an amount of 3-5% of the emulsified asphalt; and the phthalic acid alkyl amide is used in an amount of 1-3% of the emulsified asphalt.

2. The high-viscosity, water-based, non-curing waterproof coating according to claim 1, characterized in that, The raw materials include the following parts by weight: 35-45 parts emulsified asphalt, 16-18 parts chloroprene latex, 24-28 parts heavy calcium carbonate, 0.6-0.8 parts composite thickener, 17-19 parts plasticizer, and 0.25-0.35 parts polyether modified silicone defoamer.

3. A method for preparing a high-viscosity, water-based, non-curing waterproof coating as described in any one of claims 1-2, characterized in that, Includes the following steps: Emulsified asphalt and chloroprene latex are mixed and stirred evenly. Then, composite thickener, plasticizer, and polyether-modified silicone defoamer are added and mixed. Finally, the remaining raw materials are added and mixed evenly to obtain a high-viscosity water-based non-curing waterproof coating.

Images