A water repellent coating containing methyl 3-methoxypropionate

Abstract

The application discloses waterproof paint containing methyl 3-methoxypropionate, and belongs to the field of chemical new material research and development, and comprises an anchoring composition and a waterproof composition; the waterproof composition is a composition with methyl 3-methoxypropionate compound as a solvent; the anchoring composition comprises the following components in a weight percentage: 30-40 parts of corn cob carbon catalyst residue, 40-45 parts of acrylic emulsion, 5-6 parts of silane coupling agent, 2-4 parts of fumed silica, 5-7 parts of propylene glycol, 5-6 parts of heat-sensitive crosslinking agent, 2-3 parts of polycarboxylate dispersant, and the rest is deionized water. The application uses corn cob carbon catalyst residue as a core substance to form an anchoring component, and the anchoring component is sprayed between an old coating and a new waterproof layer, so that the problem that methyl 3-methoxypropionate in the waterproof layer penetrates to the old coating and causes the old coating to swell can be avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of chemical new material research and development, and relates to a waterproof coating containing methyl 3-methoxypropanoate. BACKGROUND

[0002] Methyl 3-methoxypropanoate solvent has a slight odor and complete volatilization, and no residual odor on the surface of the coating, which can increase the leveling property, gloss and transparency of the coating. Therefore, methyl 3-methoxypropanoate is widely used as a solvent in waterproof, anticorrosion and other coatings.

[0003] At present, the waterproof coating using methyl 3-methoxypropanoate as a solvent has good leveling property and gloss due to the advantages of methyl 3-methoxypropanoate, and the curing speed of the coating is relatively fast due to the volatility of methyl 3-methoxypropanoate. However, it is found in actual use that the waterproof coating using methyl 3-methoxypropanoate as a solvent causes swelling of the old coating and affects the renovation effect in the process of renovation of the old coating due to the strong polarity of methyl 3-methoxypropanoate. SUMMARY

[0004] The application aims to provide a waterproof coating containing methyl 3-methoxypropanoate, which solves the problem that the waterproof coating using methyl 3-methoxypropanoate as a solvent causes swelling of the old coating and affects the renovation effect in the process of renovation of the old coating due to the strong polarity of methyl 3-methoxypropanoate.

[0005] The technical scheme adopted by the application is as follows.

[0006] The waterproof coating containing methyl 3-methoxypropanoate comprises an anchoring composition and a waterproof composition, and the waterproof composition is a composition using a methyl 3-methoxypropanoate complex as a solvent.

[0007] The anchoring composition comprises the following components in parts by weight: 30-40 parts of corn cob carbon catalyst residue, 40-45 parts of acrylic emulsion, 5-6 parts of silane coupling agent, 2-4 parts of fumed silica, 5-7 parts of propylene glycol, 5-6 parts of heat-sensitive crosslinking agent, 2-3 parts of polycarboxylate dispersant, and the balance is deionized water.

[0008] The application uses corn cob carbon catalyst residue as a core substance to form an anchoring component, which is sprayed between the old coating and the new waterproof layer to avoid the problem that methyl 3-methoxypropanoate in the waterproof layer penetrates to the old coating and causes swelling of the old coating.

[0009] The corn cob charcoal catalyst residue used in the present application is the residue generated in the process of preparing 3-methoxy propionic acid methyl ester by using the corn cob charcoal catalyst, and the process of preparing 3-methoxy propionic acid methyl ester by using the corn cob charcoal catalyst is disclosed in the patent document with the patent number 202411206332.5; 202411206332.5 removes hemicellulose from the corn cob, then carbonizes by high-temperature pyrolysis, and then mixes with concentrated sulfuric acid to heat and sulfonate to prepare the corn cob charcoal catalyst; when the corn cob charcoal catalyst is used to catalyze acetic acid and methanol to prepare methyl acetate, the yield of methyl acetate can be effectively improved; and after the corn cob charcoal catalyst is repeatedly used, the catalytic activity is reduced, and it needs to be sulfonated again to improve its activity; in order to realize the recycling of the corn cob charcoal catalyst and avoid waste, the corn cob charcoal catalyst is generally resulfonated at present;

[0010] Although the corn cob charcoal catalyst can be reused, it needs to be resulfonated, and the resulfonation needs to use concentrated sulfuric acid for heating and sulfonation, and the concentrated sulfuric acid has the problem of high safety risk, and repeated resulfonation increases the use rate of concentrated sulfuric acid, thereby increasing the safety risk.

[0011] Therefore, based on the preparation process and use method of the corn cob charcoal catalyst disclosed in 202411206332.5, in order to improve the recycling of the corn cob charcoal catalyst and reduce the safety risk, the present application converts the energy (the corn cob charcoal catalyst is finally converted into a coating component), and the present application develops a preparation method of an anchoring layer which can directly use the corn cob charcoal catalyst residue in the process of preparing a waterproof coating with 3-methoxy propionic acid methyl ester as a solvent, solves the problem that the waterproof coating with 3-methoxy propionic acid methyl ester as a solvent easily causes the old coating to swell and affects the effect of renovation during the process of renovating the old coating, and realizes the recycling of the corn cob charcoal catalyst; the present application is applied to the field of 3-methoxy propionic acid methyl ester, realizes the conversion of 3-methoxy propionic acid methyl ester, and simultaneously realizes the energy conversion of the corn cob charcoal catalyst, converts 3-methoxy propionic acid methyl ester and the corn cob charcoal catalyst residue in the process of preparing 3-methoxy propionic acid methyl ester into a coating finished product.

[0012] In the process of preparing the anchoring layer, the corn cob charcoal catalyst residue does not need to be activated or treated, and can be directly used with other components.

[0013] Further, the 3-methoxy propionic acid methyl ester complex includes 3-methoxy propionic acid methyl ester and propylene glycol methyl ether acetate, and the mass ratio of 3-methoxy propionic acid methyl ester to propylene glycol methyl ether acetate is 2-4:1.

[0014] Further, the waterproof composition comprises the following components in parts by weight: 40-50 parts of NCO-terminated polyurethane prepolymer, 20-25 parts of methyl 3-methoxypropionate complex, 20-25 parts of filler, 1.5-2.5 parts of amino silane, 1-2 parts of phosphate ester adhesion promoter, 0.2-0.4 parts of organic bismuth, 1-3 parts of dispersant.

[0015] Further, the corncob char catalyst residue is obtained by the following method:

[0016] A1, after crushing and sieving the corncob, the corncob is mixed with dilute sulfuric acid and heated to remove hemicellulose, then high-temperature pyrolysis carbonization is carried out, and finally the corncob is mixed with concentrated sulfuric acid and heated for sulfonation to obtain a corncob char catalyst;

[0017] A2, acetic acid, methanol and the above-mentioned corncob char catalyst are added to a first reaction kettle for reaction, after the reaction is completed, the methyl acetate obtained by the reaction is separated out by distillation, the distillate is the methyl acetate product, and the remainder is the corncob char catalyst residue.

[0018] Further, the filler comprises the following components in parts by weight: 8-10 parts of nano titanium dioxide, 4-5 parts of hydrophobic fumed silica, 4-5 parts of nano modified calcium carbonate, and 4-5 parts of polytetrafluoroethylene micro powder.

[0019] Further, the nano modified calcium carbonate is nano calcium carbonate coated with stearic acid, and the amount of stearic acid is 3% of the mass of the nano calcium carbonate.

[0020] Further, the silane coupling agent is KH-560 silane coupling agent.

[0021] Further, the heat-sensitive crosslinking agent is trimethylolpropane trimethacrylate.

[0022] Further, the thickness ratio of the anchoring layer formed by the anchoring composition to the waterproof layer formed by the waterproof composition is 1:1.5-2.

[0023] Further, the anchoring composition comprises the following components in parts by weight: 40 parts of corncob char catalyst residue, 45 parts of acrylic emulsion, 6 parts of silane coupling agent, 4 parts of fumed silica, 7 parts of propylene glycol, 3 parts of polycarboxylate dispersant, 6 parts of heat-sensitive crosslinking agent, and the balance is deionized water.

[0024] The waterproof composition comprises the following components in parts by weight: 50 parts of NCO-terminated polyurethane prepolymer, 25 parts of methyl 3-methoxypropionate complex, 25 parts of filler, 2.5 parts of amino silane, 2 parts of phosphate ester adhesion promoter, 0.4 parts of organic bismuth, and 3 parts of high molecular block copolymer dispersant.

[0025] 3:1 by mass of methyl 3-methoxypropionate, propylene glycol methyl ether acetate.

[0026] In summary, due to the adoption of the technical scheme, the present application has the following advantages:

[0027] 1. In the waterproof coating containing methyl 3-methoxypropionate, the anchoring component forms an anchoring layer, and the waterproof component forms a waterproof layer as a new waterproof layer. The anchoring component mainly comprises corn cob carbon catalyst residue, which includes a porous carbon skeleton, residual sulfonic acid groups, and organic residues. The porous structure has high adsorption and a multi-level pore structure of the porous carbon skeleton forms a composite structure similar to a "honeycomb-channel", which forms a tortuous path. In the case of physical adsorption of the porous structure in the waterproof layer, the migration path of the methyl 3-methoxypropionate solvent in the waterproof layer is extended due to the "honeycomb-channel" composite structure, and the time for the old coating to contact the methyl 3-methoxypropionate solvent is increased. In this time period, as the anchoring layer solidifies, the methyl 3-methoxypropionate solvent penetrating into the anchoring layer is locked by the network cross-linked structure formed by solidification, thereby preventing the methyl 3-methoxypropionate solvent in the new coating from fully contacting the old coating, and effectively preventing the swelling phenomenon of the old coating during the renovation process.

[0028] 2. In the present application, the waterproof composition takes end NCO polyurethane prepolymer as the core substance, which will release heat during the curing process. During the heat release process, the anchoring layer is heated, and the heat-sensitive cross-linking agent in the anchoring layer will initiate a cross-linking reaction, which forms a network structure and simultaneously locks the corn cob carbon catalyst residue. The porous structure formed by the corn cob carbon catalyst residue is blocked, effectively preventing the methyl 3-methoxypropionate solvent penetrating into the corn cob carbon catalyst residue layer from continuing to migrate.

[0029] 3. In the present application, the anchoring layer comprises acrylic emulsion, silane coupling agent, propylene glycol, dispersant, and corn cob carbon catalyst residue, which ensures the anchoring layer to have high connection strength with the waterproof layer and the old coating while preventing the penetration of the methyl 3-methoxypropionate solvent in the waterproof layer.

[0030] 4. In the present application, the waterproof composition takes end NCO polyurethane prepolymer as the core substance, which can improve the curing speed and penetration resistance of the anchoring layer, and cooperate with other components to form a uniform coating with high waterproof performance.

[0031] 5. In the present application, the filler in the waterproof composition and the corn cob carbon catalyst residue in the anchoring layer form a particle filling gradation, which improves the density of the entire coating and has high waterproof performance. The overall waterproof effect of the integrated coating formed by the combination of the anchoring layer and the waterproof layer is better than that of a single waterproof layer. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings, in which:

[0033] Figure 1 is the actual application diagram of the present application for polyurethane waterproof old coating renovation. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application, that is, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] Therefore, the detailed description of the embodiments of the present application provided in the drawings below is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art on the basis of the embodiments of the present application without creative labor are within the scope of protection of the present application.

[0036] It should be noted that the relational terms such as "first" and "second" and the like are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or equipment including the element.

[0037] The features and properties of the present application will be further described in detail below with reference to the embodiments.

[0038] Embodiment 1

[0039] The waterproof coating containing methyl 3-methoxypropionate provided by the preferred embodiment of the present application comprises an anchoring composition and a waterproof composition; the waterproof composition is a composition with methyl 3-methoxypropionate complex as a solvent;

[0040] The anchoring composition comprises the following components in parts by weight: 30 parts of corn cob carbon catalyst residue, 40 parts of acrylic emulsion, 5 parts of silane coupling agent, 2 parts of fumed silica, 5 parts of propylene glycol, 5 parts of heat-sensitive crosslinking agent, 2 parts of polycarboxylate dispersant, and the balance is deionized water.

[0041] The methyl 3-methoxypropionate complex comprises methyl 3-methoxypropionate and propylene glycol methyl ether acetate, and the mass ratio of methyl 3-methoxypropionate to propylene glycol methyl ether acetate is 2:1.

[0042] The waterproof composition comprises the following components in parts by weight: 40 parts of NCO-terminated polyurethane prepolymer, 20 parts of methyl 3-methoxypropionate complex, 20 parts of filler, 1.5 parts of amino silane, 1 part of phosphate adhesion promoter, 0.2 parts of organic bismuth, and 1 part of dispersant.

[0043] The corn cob carbon catalyst residue is obtained by the following method:

[0044] A1, after crushing and sieving the corn cob, the corn cob is mixed with dilute sulfuric acid and heated to remove hemicellulose, then high-temperature pyrolysis carbonization is carried out, and finally the corn cob is mixed with concentrated sulfuric acid and heated for sulfonation to obtain a corn cob carbon catalyst;

[0045] A2, acetic acid, methanol and the above-mentioned corn cob carbon catalyst are added to a first reaction kettle for reaction, after the reaction is completed, the methyl acetate obtained by the reaction is separated out by distillation, the distillate is a methyl acetate product, and the remainder is a corn cob carbon catalyst residue.

[0046] The filler comprises the following components in parts by weight: 8 parts of nano titanium dioxide, 4 parts of hydrophobic fumed silica, 4 parts of nano modified calcium carbonate, and 4 parts of polytetrafluoroethylene powder.

[0047] The nano modified calcium carbonate is nano calcium carbonate wrapped with stearic acid, and the addition amount of stearic acid is 3% of the mass of the nano calcium carbonate.

[0048] The silane coupling agent is KH-560 silane coupling agent.

[0049] The heat-sensitive crosslinking agent is trimethylolpropane trimethacrylate.

[0050] The thickness ratio of the anchoring layer formed by the anchoring composition to the waterproof layer formed by the waterproof composition is 1:1.5.

[0051] The waterproof coating containing methyl 3-methoxypropionate is prepared by the following method:

[0052] S1, preparing the anchoring composition: grinding the corncob carbon catalyst residue to obtain corncob carbon catalyst residue powder, then dispersing the corncob carbon catalyst residue powder in deionized water to obtain a suspension, and then adding acrylic emulsion and propylene glycol to the suspension under stirring, mixing uniformly, then adding silane coupling agent, continuing to stir uniformly, then adding polycarboxylate dispersant, fumed silica and heat-sensitive crosslinking agent, mixing uniformly to obtain the anchoring composition;

[0053] S2, preparing the waterproofing composition: adding methyl 3-methoxypropionate complex into a stirring kettle, stirring uniformly, then heating to 40℃, slowly adding NCO-terminated polyurethane prepolymer under stirring, stirring at 200-300 rpm until mixing uniformly to obtain a uniform mixture; then adding aminosilane, phosphate adhesion promoter, organic bismuth catalyst and dispersant into the mixture in sequence, continuing to stir for 30-45 minutes, then slowly adding fillers, high-speed dispersing at 500-800 rpm for 1-2 hours to obtain a uniform waterproofing composition; wherein the fillers include multiple components which are mixed uniformly in advance, and then added into the stirring kettle after mixing;

[0054] S3, separate packaging: the anchoring composition and the waterproofing composition are separately packaged, and stored in the dark and sealed.

[0055] When the above waterproofing coating is used for old coating renovation, the old coating can be an epoxy or polyurethane coating, and the spraying method for old coating renovation is as follows: first, the old coating is cleaned and polished, then the anchoring composition is uniformly sprayed on the surface of the old coating, the surface is dried for 15-20 minutes, then the waterproofing composition is uniformly sprayed, and the old coating renovation is completed after natural curing.

[0056] Example 2

[0057] In this example, based on Example 1, the anchoring composition includes the following components in weight fraction: 35 parts of corncob carbon catalyst residue, 43 parts of acrylic emulsion, 6 parts of silane coupling agent, 3 parts of fumed silica, 6 parts of propylene glycol, 6 parts of heat-sensitive crosslinking agent, 3 parts of polycarboxylate dispersant, and the balance is deionized water.

[0058] The waterproofing composition includes the following components in weight fraction: 45 parts of NCO-terminated polyurethane prepolymer, 23 parts of methyl 3-methoxypropionate complex, 23 parts of fillers, 2 parts of aminosilane, 2 parts of phosphate adhesion promoter, 0.3 parts of organic bismuth, and 2 parts of dispersant.

[0059] The fillers include the following components in weight fraction: 9 parts of nano titanium dioxide, 5 parts of hydrophobic fumed silica, 5 parts of nano modified calcium carbonate, and 4 parts of polytetrafluoroethylene micro powder.

[0060] Example 3

[0061] The anchoring composition comprises the following components in parts by weight: 40 parts of corn cob charcoal catalyst residue, 45 parts of acrylic emulsion, 6 parts of silane coupling agent, 4 parts of fumed silica, 7 parts of propylene glycol, 3 parts of polycarboxylate dispersant, 6 parts of heat-sensitive crosslinking agent, and the balance is deionized water;

[0062] The waterproof composition comprises the following components in parts by weight: 50 parts of NCO-terminated polyurethane prepolymer, 25 parts of methyl 3-methoxypropionate complex, 25 parts of filler, 2.5 parts of amino silane, 2 parts of phosphate adhesion promoter, 0.4 parts of organic bismuth, and 3 parts of high-molecular-weight block copolymer dispersant.

[0063] The filler comprises the following components in parts by weight: 10 parts of nano-titanium dioxide, 5 parts of hydrophobic fumed silica, 5 parts of nano-modified calcium carbonate, and 5 parts of polytetrafluoroethylene micro powder.

[0064] Example 4

[0065] In this example, the mass ratio of methyl 3-methoxypropionate to propylene glycol methyl ether acetate in the methyl 3-methoxypropionate complex is 3:1 based on Example 3.

[0066] Example 5

[0067] In this example, the mass ratio of methyl 3-methoxypropionate to propylene glycol methyl ether acetate in the methyl 3-methoxypropionate complex is 4:1 based on Example 3.

[0068] Example 6

[0069] In this example, the thickness ratio of the anchoring layer formed by the anchoring composition to the waterproof layer formed by the waterproof composition is 1:1.7 based on Example 4.

[0070] Example 7

[0071] In this example, the thickness ratio of the anchoring layer formed by the anchoring composition to the waterproof layer formed by the waterproof composition is 1:2 based on Example 4.

[0072] Figure 1 The actual application diagram of the waterproof coating within the scope of this example for the renovation of the polyurethane waterproof coating (old coating) is shown in the figure. The coating surface is smooth and flat, without bubbles, wrinkles, and other phenomena. From the coating surface, it can be seen that when the polyurethane waterproof coating (old coating) is renovated, the renovated layer will not have abnormal coating conditions, and it can be used for the renovation of the polyurethane waterproof coating.

[0073] Comparative Example 1

[0074] The comparative example is based on example 1. The waterproof coating containing methyl 3-methoxypropionate provided by the comparative example does not include an anchoring composition, but only includes a waterproof composition, which includes the following components in parts by weight: 40 parts of NCO-terminated polyurethane prepolymer, 20 parts of methyl 3-methoxypropionate complex, 20 parts of filler, 1.5 parts of amino silane, 1 part of phosphate adhesion promoter, 0.2 parts of organic bismuth, 1 part of dispersant; the methyl 3-methoxypropionate complex includes methyl 3-methoxypropionate, propylene glycol methyl ether acetate, and the mass ratio of methyl 3-methoxypropionate to propylene glycol methyl ether acetate is 2:1.

[0075] The preparation method of the waterproof component is as follows: add the methyl 3-methoxypropionate complex into a stirred tank, uniformly stir, then heat to 40°C, and slowly add the NCO-terminated polyurethane prepolymer under stirring, stir at a speed of 200-300 rpm until the mixture is uniform, to obtain a uniform mixture; sequentially add the amino silane, phosphate adhesion promoter, organic bismuth catalyst, and dispersant into the mixture, continue to stir for 30-45 minutes, then slowly add the filler, and disperse at a high speed of 500-800 rpm for 1-2 hours, to obtain a uniform waterproof composition; wherein the filler includes multiple components, which need to be mixed uniformly in advance, and then added into the stirred tank.

[0076] Comparative example 2

[0077] The comparative example is based on example 1. The comparative example provides a waterproof coating containing methyl 3-methoxypropionate, and the anchoring layer of the waterproof coating does not include corn cob carbon catalyst residue.

[0078] Comparative example 3

[0079] The comparative example is based on example 1. The comparative example provides a waterproof coating containing methyl 3-methoxypropionate, and the anchoring layer of the waterproof coating does not include acrylic emulsion.

[0080] Comparative example 4

[0081] The comparative example is based on example 1. The comparative example provides a waterproof coating containing methyl 3-methoxypropionate, and the anchoring layer of the waterproof coating does not include silane coupling agent.

[0082] Comparative example 5

[0083] The comparative example is based on example 1. The comparative example provides a waterproof coating containing methyl 3-methoxypropionate, and the anchoring layer of the waterproof coating does not include propylene glycol.

[0084] Comparative example 6

[0085] The comparative example is based on Example 1, and the anchor layer of the waterproof coating containing methyl 3-methoxypropionate provided by the comparative example does not include a heat-sensitive crosslinking agent.

[0086] Comparative Example 7

[0087] The comparative example is based on Example 1, and the methyl 3-methoxypropionate complex in the waterproof composition described in the comparative example only includes methyl 3-methoxypropionate, and does not include propylene glycol methyl ether acetate.

[0088] Comparative Example 8

[0089] The comparative example is based on Example 4, and the thickness ratio of the anchor layer formed by the anchor composition to the waterproof layer formed by the waterproof composition in the comparative example is 1:1.

[0090] Comparative Example 9

[0091] The comparative example is based on Example 4, and the thickness ratio of the anchor layer formed by the anchor composition to the waterproof layer formed by the waterproof composition in the comparative example is 1:2.5.

[0092] Test Example 1

[0093] The swelling of the waterproof coating prepared in Examples 1-7 and Comparative Examples 1-9 sprayed on the surface of a polyurethane waterproof coating (existing coating), an epoxy waterproof coating (existing coating) was detected, the thickness of the polyurethane waterproof coating and the epoxy waterproof coating was 200 μm, the waterproof coating prepared in Examples 1-7 and Comparative Examples 1-9 was the detection sample, the thickness of the detection sample sprayed on the polyurethane waterproof coating and the epoxy waterproof coating was 120 μm, and whether "biting" phenomenon (surface blistering, wrinkling or separation from the substrate) occurred was observed, and the results are shown in Table 1.

[0094] Table 1 Swelling Detection

[0095]

[0096]

[0097] Test Example 2

[0098] Based on Test Example 1, the waterproof resistance, salt spray resistance, acid resistance, and alkali resistance of the composite coating obtained according to the spraying method given in Examples 1-7 and Comparative Examples 1-9 were detected, with the polyurethane waterproof coating and the epoxy waterproof coating as the base layer, and the waterproof coating prepared in Examples 1-7 and Comparative Examples 1-9 as the surface layer; the detection results are shown in Table 2.

[0099] Water resistance: according to GB / T 1733-1993 "Paint film water resistance test method", after soaking in water for 96 h, whether the coating layer showed abnormal phenomena such as blistering and peeling was observed;

[0100] Acid resistance: according to GB / T 9274-1988 "Determination of resistance to liquid media of paints and varnishes", after 96h immersion in 5% hydrochloric acid solution, observe whether the coating layer has abnormal phenomena such as blistering, peeling, etc.

[0101] Alkali resistance: according to GB / T 9265-2009 "Determination of alkali resistance of coatings on buildings", after 96h immersion in 5% sodium hydroxide solution, observe whether the coating layer has abnormal phenomena such as blistering, peeling, etc.

[0102] Salt spray resistance: according to GB / T 1771-2007 "Determination of resistance to neutral salt spray of paints and varnishes", after 1000h salt spray test in a salt spray test chamber, observe whether the coating layer has abnormal phenomena such as blistering, peeling, etc.

[0103] Table 2 Performance test of composite coating

[0104]

[0105]

[0106] Test Example 3

[0107] The adhesion strength between the single anchoring layer (without waterproof layer) and the polyurethane waterproof layer (Q1) in Examples 1-3, and the adhesion strength between the waterproof layer + anchoring layer composite layer as a whole and the polyurethane waterproof layer (Q2) were detected, and the results are shown in Table 3.

[0108] Q1: The anchoring composition was sprayed on the substrate with a polyurethane waterproof coating layer (existing coating layer, high-strength polyurethane waterproof coating layer, adhesion strength to the substrate greater than 2.5MPa), and after curing, a tensile testing machine (such as GB / T 16777-2008 standard) was used for 180° peeling test, and the maximum peeling force was recorded;

[0109] Q2: The anchoring composition was sprayed on the substrate with a polyurethane waterproof coating layer (existing coating layer), and after 15 minutes of surface drying, the waterproof composition was sprayed, and after curing, a tensile testing machine (such as GB / T 16777-2008 standard) was used for 180° peeling test, and the maximum peeling force between the waterproof layer + anchoring layer composite layer as a whole and the polyurethane waterproof layer was recorded.

[0110] Table 3 Detection results of adhesion strength between layers

[0111] Bonding strength Q1 (MPa) Bonding strength Q2 (MPa) Example 1 1.5-1.6 2.7-2.8 Example 2 1.7-1.8 3.0-3.1 Example 3 2.0-2.1 3.2-3.3

[0112] In the process of detecting the bonding strength, when the waterproof layer + anchoring layer composite layer is peeled off as a whole from the polyurethane waterproof layer, the waterproof layer + anchoring layer composite layer is still in the whole structure, and the waterproof layer + anchoring layer composite layer has strong bonding strength; as shown in Table 3, the waterproof layer in the application has the effect of strengthening the bonding capacity of the anchoring layer; the bonding strength between the waterproof layer + anchoring layer composite layer as a whole and the polyurethane waterproof layer (old coating) in the application meets the bonding strength requirement of the waterproof coating.

[0113] The above merely describes the preferred embodiments of the present application and is not used to limit the protection scope of the present application, and any modification, equivalent replacement, improvement, etc. made by any person skilled in the art within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A waterproof coating containing methyl 3-methoxypropionate, characterized in that: It includes an anchoring composition and a waterproofing composition; the waterproofing composition is a composition using methyl 3-methoxypropionate complex as a solvent; The anchoring composition comprises the following components in parts by weight: 30-40 parts corn cob carbon catalyst residue, 40-45 parts acrylic emulsion, 5-6 parts silane coupling agent, 2-4 parts fumed silica, 5-7 parts propylene glycol, 5-6 parts thermosensitive crosslinking agent, 2-3 parts polycarboxylate dispersant, and the balance being deionized water. The methyl 3-methoxypropionate complex comprises methyl 3-methoxypropionate and propylene glycol methyl ether acetate, wherein the mass ratio of methyl 3-methoxypropionate to propylene glycol methyl ether acetate is 2-4:

1. The waterproof composition comprises the following components in parts by weight: 40-50 parts of NCO-terminated polyurethane prepolymer, 20-25 parts of methyl 3-methoxypropionate complex, 20-25 parts of filler, 1.5-2.5 parts of aminosilane, 1-2 parts of phosphate adhesion promoter, 0.2-0.4 parts of organobismuth, and 1-3 parts of dispersant. The corn cob carbon catalyst residue was obtained by the following method: A1. After crushing and sieving the corn cob, mix it with dilute sulfuric acid and heat it to remove hemicellulose. Then, perform high-temperature pyrolysis and carbonization. Finally, mix it with concentrated sulfuric acid and heat it to sulfonate to obtain corn cob carbon catalyst. A2. Acetic acid, methanol and the above corn cob carbon catalyst are added to the first reaction vessel for reaction. After the reaction is completed, the methyl acetate obtained by the reaction is separated by distillation. The fraction is methyl acetate product and the remainder is corn cob carbon catalyst residue. The thickness ratio of the anchoring layer formed by the anchoring composition to the waterproofing layer formed by the waterproofing composition is 1:1.5-2; The thermosensitive crosslinking agent is trimethylolpropane trimethacrylate.

2. The waterproof coating containing methyl 3-methoxypropionate according to claim 1, characterized in that: The filler comprises the following components in parts by weight: 8-10 parts nano titanium dioxide, 4-5 parts hydrophobic fumed silica, 4-5 parts nano modified calcium carbonate, and 4-5 parts polytetrafluoroethylene micro powder.

3. A waterproof coating containing methyl 3-methoxypropionate according to claim 2, characterized in that: The nano-modified calcium carbonate is stearic acid-coated calcium carbonate, and the amount of stearic acid added is 3% of the mass of the calcium carbonate.

4. A waterproof coating containing methyl 3-methoxypropionate according to claim 1, characterized in that: The silane coupling agent is KH-560 silane coupling agent.

5. A waterproof coating containing methyl 3-methoxypropionate according to claim 3, characterized in that: The anchoring composition comprises the following components in parts by weight: 40 parts corn cob carbon catalyst residue, 45 parts acrylic emulsion, 6 parts silane coupling agent, 4 parts fumed silica, 7 parts propylene glycol, 3 parts polycarboxylate dispersant, 6 parts thermosensitive crosslinking agent, and the balance being deionized water. The waterproof composition comprises the following components in parts by weight: 50 parts of NCO-terminated polyurethane prepolymer, 25 parts of methyl 3-methoxypropionate complex, 25 parts of filler, 2.5 parts of aminosilane, 2 parts of phosphate adhesion promoter, 0.4 parts of organic bismuth, and 3 parts of polymeric block copolymer dispersant; the mass ratio of methyl 3-methoxypropionate to propylene glycol methyl ether acetate is 3:1.

Images