Water-based polymer coating capable of preventing water permeation and application of water-based polymer coating

Abstract

The invention belongs to the technical field of waterproof building material coatings, and particularly relates to a water-permeation-preventing water-based polymer coating and application thereof.The matrix resin of the coating is water-based elastic silicon-containing permeable reactive resin, polyether glycol and phthalic anhydride are subjected to a reaction and dehydration to generate polyether phthalate, and then the polyether phthalate is added into the water-based elastic silicon-containing permeable reactive resin; and reacting with methylsilantriol and dehydrating to generate polyether methylsilanediol phthalate, namely the water-based elastic silicon-containing permeable reactive resin disclosed by the scheme. Silicon hydroxyl at the tail end of a resin molecule permeates into pores of a cement matrix and is subjected to a dehydration cross-linking reaction with silicon hydroxyl of a Portland cement matrix, and a volume expansion effect occurs in the pores, so that the pores in the cement matrix are blocked, the peel strength of the coating is greatly improved, and the service life of the coating is prolonged. And an excellent and compact elastic waterproof permeable layer is formed on the surface of a cement matrix.

Description

Technical Field

[0001] The invention belongs to the technical field of waterproof building material coatings, and particularly relates to a water-based polymer coating that prevents water penetration and its application. Background Art

[0002] At present, the main measure used is to apply a waterproof coating on the surface of the building to prevent water seepage in the building walls and floors. During construction, the coated surface is first cleaned and then coated with a waterproof coating layer. But in fact, the structural stability of some building surfaces after the waterproof coating is coated is poor, and the adhesion between the coating surface and the coating surface is not ideal, which is prone to falling off and cracking, thus bringing inconvenience to the waterproofing of the building. In addition, in actual construction, in order to consolidate the waterproof and anti-seepage effect, it is often necessary to repeat the coating multiple times, which also leads to a long construction process. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a water-based polymer coating that prevents water penetration. The base resin of the coating is a water-based elastic silicon-containing penetration reactive resin, and the specific molecular structure is as follows:

[0004] ,

[0005] Wherein, a is an integer not less than 7 and not more than 15, and G is the middle part of the molecular structure of polyethylene glycol excluding the hydroxyl groups at both ends or the middle part of the molecular structure of polypropylene glycol excluding the hydroxyl groups at both ends.

[0006] The synthesis preparation method of the above-mentioned water-based elastic silicon-containing penetrating reactive resin is as follows:

[0007] (1) After mixing polyether diol and phthalic anhydride in a molar ratio of a: (a+1), the temperature is raised to 118°C to 125°C and kept at this temperature for a period of time under the protection of nitrogen gas and continuous stirring. The reflux dehydration measure is further started and the temperature is further raised to 180°C to 190°C and kept at this temperature for a period of time to fully generate polyether phthalate. The temperature is then lowered. The reaction formula is as follows:

[0008]

[0009] (2) The polyether phthalate and methyl silicone triol obtained in step (1) are mixed in a molar ratio of 1:2, and the mixture is heated to 70°C to 80°C under the protection of nitrogen gas. Stirring and reflux dehydration are further started, and the mixture is heated to 190°C to 200°C and kept for a period of time to fully generate polyether phthalate methyl silicone diol ester, i.e., a water-based elastic silicon-containing penetrating reactive resin. The reaction formula is as follows:

[0010]

[0011] Preferably, the polyether diol in step (1) is polyethylene glycol (PEG) or polypropylene glycol (PPG);

[0012] Preferably, in step (1), xylene is added to the polyether diol and phthalic anhydride as a reflux dehydrating agent.

[0013] Preferably, in step (2), xylene is added to the polyether phthalate and methylsilicone triol as a reflux dehydrating agent.

[0014] Preferably, the water-based elastic silicon-containing penetrating reactive resin is present in the coating in the form of an emulsion, and the emulsion is prepared as follows:

[0015] The polyether methylsilicone phthalate obtained in the above step (2) is heated to 70°C to 80°C, stirred and emulsified under heat preservation, and deionized water is added dropwise until the system becomes milky white and viscous. The addition of deionized water is stopped, and the emulsification is continued under heat preservation and stirring for a period of time. Deionized water is added dropwise under heat preservation and stirring until the solid content of the system reaches 45% to 55%. The addition of deionized water is stopped and the temperature is lowered to obtain a water-based elastic silicon-containing penetrating reactive resin emulsion.

[0016] As a preferred embodiment, the coating composition includes, in addition to the above-mentioned water-based elastic silicon-containing penetrating reactive resin emulsion, one or a combination of water-based dispersant, water-based anti-settling agent, defoamer, bactericide, silicon micropowder, pigment powder, and water. Calculated by weight, the water-based elastic silicon-containing penetrating reactive resin emulsion is 50 parts, the water-based dispersant is 1-2 parts, the water-based anti-settling agent is 1-3 parts, the defoamer is 1-2 parts, the bactericide is 1-2 parts, the silicon micropowder is 15-25 parts, the pigment powder is 5-8 parts, and the water is 10-30 parts. During preparation, the above-mentioned components are dispersed and mixed sufficiently at high speed, and then ground to a fineness of less than 30 microns.

[0017] The present invention also provides an application of the water-based polymer coating for preventing water penetration, that is, the coating is coated on a cement substrate to form a film.

[0018] The specific beneficial effect of the present invention is that after the coating is applied to the surface of the cement substrate, the water-based elastic silicon-containing penetrating reactive resin molecules in the coating penetrate into the capillaries of the cement substrate, and the silanol groups at the ends of the elastic resin molecular chains also undergo a dehydration cross-linking reaction with the silanol groups of the silicate cement substrate. Heat is released during the reaction, and the heat softens the molecular chains of the elastic resin entering the capillaries. After the reaction is sufficient and the temperature is restored, the molecular chains recover their elasticity in the capillaries and a crystallization expansion effect occurs. The expansion effect further blocks the capillaries, achieving an anti-capillary effect, and greatly improving the adhesion between the deep layer of the coating and the cement substrate. The adhesion can reach more than 5MPa, which is already very high for elastic coatings. At the same time, an excellent and dense elastic waterproof penetration layer is further formed on the surface of the cement substrate, and the anti-osmotic pressure of the coating can reach more than 8MPa. DETAILED DESCRIPTION

[0019] Example 1

[0020] Preparation of water-based elastic silicon-containing penetrating reactive resin emulsion:

[0021] (1) 3200 g (8 mol) of PPG400 and 1335 g (9 mol) of phthalic anhydride were added to a reactor, and 25 g of xylene was added thereto as a dehydrating agent. The temperature was raised while nitrogen was continuously introduced. Stirring was started when the temperature reached 50°C. The temperature was further raised to 120°C and kept at this temperature for 2 hours. Reflux dehydration measures were further started and the temperature was further raised to 185°C and kept at this temperature for reaction. Meanwhile, the by-product water removed from the reaction system was collected. The reaction was terminated when the by-product water collected reached about 126 g. The xylene in the reaction system was evaporated to leave polyether phthalate in the reactor, and the reactants were naturally cooled to below 80°C.

[0022] (2) After adding 190 g of methylsilanetriol to the reactor of step (1), 25 g of xylene as a dehydrating agent was added thereto, and the temperature was raised while nitrogen was continuously introduced. When the temperature reached 75° C., stirring was further started and reflux dehydration measures were simultaneously started. The temperature was then raised to 190° C. and kept for reaction. Meanwhile, the byproduct water removed from the reaction system was collected. When the byproduct water collected reached about 36 g, the reaction was terminated, the xylene in the reaction system was evaporated to leave polyether methylsilane diol phthalate, i.e., the water-based elastic silicon-containing permeable reactive resin of the present application, and the reactants were naturally cooled to below 80° C.;

[0023] (3) The polyether methylsilicone phthalate obtained in step (2) is put into an emulsifying kettle and heated to 75° C., and then the emulsifying high-speed stirring is started under the heat preservation state, and deionized water is added thereto dropwise under the emulsifying high-speed stirring state until the system becomes milky white and viscous. Then, the addition of deionized water is stopped, and the emulsifying high-speed stirring is continued under the heat preservation state for 1 hour. Then, the deionized water is continued to be added thereto dropwise under the heat preservation state until the solid content of the system reaches 50%. Then, the addition of deionized water is stopped and the temperature is lowered to room temperature (25° C., the same below), thereby obtaining a water-based elastic silicon-containing penetrating reactive resin emulsion.

[0024] Preparation of water-based polymer coatings to prevent water penetration:

[0025] Calculated by weight, 50 parts of the aqueous elastic silicon-containing penetrating reactive resin emulsion prepared in this embodiment, 1 part of HTK-5040 aqueous dispersant, 2 parts of YB-401 aqueous anti-settling agent, 1 part of XP-502E defoamer, 1 part of HY-606D-2 bactericide, 15 parts of silicon micropowder, 5 parts of pigment powder, and 15 parts of deionized water are mixed and dispersed at high speed, and then ground to pass through a 500-mesh sieve.

[0026] Example 2

[0027] Preparation of water-based elastic silicon-containing penetrating reactive resin emulsion:

[0028] (1) 2800 g (7 mol) of PPG400 and 1185 g (8 mol) of phthalic anhydride were added to a reactor, and 20 g of xylene was added thereto as a dehydrating agent. The temperature was raised while nitrogen was continuously introduced. Stirring was started when the temperature reached 48°C. The temperature was further raised to 125°C and kept at this temperature for 2 hours. Reflux dehydration measures were further started and the temperature was further raised to 180°C and kept at this temperature for reaction. Meanwhile, the by-product water removed from the reaction system was collected. The reaction was terminated when the by-product water collected reached about 108 g. The xylene in the reaction system was evaporated to leave polyether phthalate in the reactor, and the reactants were naturally cooled to below 80°C.

[0029] (2) After adding 189 g of methylsilanetriol to the reactor of step (1), 20 g of xylene as a dehydrating agent was added thereto, and the temperature was raised while nitrogen was continuously introduced. When the temperature reached 70° C., stirring was further started and reflux dehydration measures were simultaneously started. The temperature was then raised to 195° C. and kept for reaction. Meanwhile, the byproduct water removed from the reaction system was collected. When the byproduct water collected reached about 36 g, the reaction was terminated, the xylene in the reaction system was evaporated to leave polyether methylsilane diol phthalate, i.e., the water-based elastic silicon-containing penetrating reactive resin of the present application, and the reactants were naturally cooled to below 80° C.;

[0030] (3) The polyether methylsilicone phthalate obtained in step (2) is put into an emulsifying kettle and heated to 70° C., and then the emulsifying high-speed stirring is started under the heat preservation state, and deionized water is added dropwise thereto under the emulsifying high-speed stirring state until the system becomes milky white and viscous. Then, the addition of deionized water is stopped, and the emulsifying high-speed stirring is continued under the heat preservation state for 1 hour. Then, the deionized water is added dropwise thereto under the heat preservation state until the solid content of the system reaches 50%. Then, the addition of deionized water is stopped and the temperature is lowered to room temperature, thereby obtaining an aqueous elastic silicon-containing penetrating reactive resin emulsion.

[0031] Preparation of water-based polymer coatings to prevent water penetration:

[0032] Calculated by weight, 50 parts of the aqueous elastic silicon-containing penetrating reactive resin emulsion prepared in this embodiment, 1 part of HTK-5040 aqueous dispersant, 1 part of YB-401 aqueous anti-settling agent, 2 parts of XP-502E defoamer, 1.5 parts of HY-606D-2 bactericide, 18 parts of silicon micropowder, 7 parts of pigment powder, and 20 parts of deionized water are mixed and dispersed at high speed, and then ground to pass through a 500-mesh sieve.

[0033] The water-based polymer coatings for preventing water penetration prepared in the above embodiments were respectively evenly sprayed on the flat surface of a standard cement sample (molded from a GSB14-1510 cement standard sample for strength test), and cured and maintained for 30 days under the catalytic action of cement in the standard cement sample, and then used as a cement surface spray sample. Based on the cement surface spray sample, the peeling strength and anti-osmotic pressure of the coating coating were tested in accordance with the standard "JC / T408-2005 Water-emulsified Asphalt Waterproof Coating", and the results are shown in Table 1; the water-based polymer coatings for preventing water penetration prepared in the above embodiments were respectively evenly sprayed on the flat surface of release paper, and thermally cured and maintained for 7 days as a release paper surface spray sample. Based on the release paper surface spray sample, the tensile strength, elongation at break and water resistance of the coating coating were tested in accordance with the standard "JC / T408-2005 Water-emulsified Asphalt Waterproof Coating", and the results are shown in Table 1.

[0034] Table 1

[0035]

[0036] From the test results in the above table, it can be seen that the silanol group at the end of the water-based elastic silicon-containing penetrating reactive resin molecule in the coating penetrates into the capillary pores of the cement matrix and undergoes a dehydration cross-linking reaction with the silanol group of the silicate cement matrix, resulting in a volume expansion effect in the capillary pores, thereby blocking the capillary pores in the cement matrix, greatly improving the peel strength of the coating, and further forming an excellent and dense elastic waterproof penetration layer on the surface of the cement matrix, thereby improving the impermeability of the coating.

Claims

1. A water-based polymer coating for preventing water penetration, characterized in that: The base resin of the coating is a water-based elastic silicon-containing permeable reactive resin, and the molecular structure of the resin is ， Wherein, a is an integer not less than 7 and not more than 15, and G is the middle part of the polyethylene glycol molecular structure excluding the two terminal hydroxyl groups or the middle part of the polypropylene glycol molecular structure excluding the two terminal hydroxyl groups.

2. The water-based polymer coating for preventing water penetration according to claim 1, characterized in that: The synthetic preparation method of the water-based elastic silicon-containing infiltration reactive resin is as follows: (1) After mixing polyether diol and phthalic anhydride in a molar ratio of a:(a+1), the temperature is raised to 180°C to 190°C under nitrogen flow, stirring, and reflux dehydration, and then the temperature is kept for a period of time to fully generate polyether phthalate, and then the temperature is lowered; (2) The polyether phthalate and methyl silicone triol obtained in step (1) are mixed in a molar ratio of 1:2, and the mixture is heated to 190° C. to 200° C. under nitrogen flow, stirring, and reflux dehydration. The mixture is then kept warm for a period of time to fully generate polyether phthalate methyl silicone diol ester, i.e., the water-based elastic silicon-containing penetrating reactive resin.

3. The water-based polymer coating for preventing water penetration according to claim 2, characterized in that: In step (1), during the heating process, the temperature is first raised to 118°C to 125°C under the nitrogen flow and stirring measures, and then kept warm for a period of time, and then the reflux dehydration is further started and the temperature is continued to be raised to 180°C to 190°C.

4. The water-based polymer coating for preventing water penetration according to claim 2, characterized in that: In step (1), xylene is added to the polyether diol and the phthalic anhydride as a reflux dehydrating agent.

5. The water-based polymer coating for preventing water penetration according to claim 2, characterized in that: In step (2), during the heating process, after the temperature is raised to 70°C to 80°C under the nitrogen flow, the stirring and the reflux dehydration are further started and the temperature is continued to be raised to 190°C to 200°C.

6. The water-based polymer coating for preventing water penetration according to claim 2, characterized in that: In step (2), xylene is added to the polyether phthalate and the methylsilicone triol as a reflux dehydrating agent.

7. The water-based polymer coating for preventing water penetration according to claim 1, characterized in that: The water-based elastic silicon-containing penetrating reactive resin exists in the coating in the form of an emulsion, and the preparation method of the emulsion is as follows: After the water-based elastic silicon-containing penetrating reactive resin is heated to 70° C. to 80° C., stirring is started under heat preservation and deionized water is added dropwise thereto until the system becomes milky white and viscous. Then, the addition of deionized water is stopped. After the stirring is continued under heat preservation for a period of time, deionized water is continued to be added dropwise thereto under heat preservation and stirring until the solid content of the system reaches 45% to 55%. Then, the addition of deionized water is stopped and the temperature is lowered to obtain a water-based elastic silicon-containing penetrating reactive resin emulsion.

8. The water-based polymer coating for preventing water penetration according to claim 7, characterized in that: The coating also includes one or more of a combination of aqueous dispersant, aqueous anti-settling agent, defoamer, bactericide, silica powder, pigment powder, and water. Calculated by weight, the aqueous elastic silicon-containing penetrating reactive resin emulsion is 50 parts, the aqueous dispersant is 1-2 parts, the aqueous anti-settling agent is 1-3 parts, the defoamer is 1-2 parts, the bactericide is 1-2 parts, the silica powder is 15-25 parts, the pigment powder is 5-8 parts, and the water is 10-30 parts.

9. Use of a water-based polymer coating for preventing water penetration according to any one of claims 1 to 8, characterized in that: The application is to apply the water-based polymer coating that prevents water penetration onto a cement substrate to form a film.

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