WO2023045553A1

WO2023045553A1 - Highly water-resistant environmentally-friendly waterproof sealant, preparation method therefor and application thereof

Info

Publication number: WO2023045553A1
Application number: PCT/CN2022/108521
Authority: WO
Inventors: 牛海波; 李忠人; 贺小钢
Original assignee: 江苏凯伦建材股份有限公司
Priority date: 2021-09-26
Filing date: 2022-07-28
Publication date: 2023-03-30
Also published as: CN113717657B; CN113717657A

Abstract

The present invention relates to a waterproof sealant, a preparation method therefor and an application thereof. The waterproof sealant comprises emulsified asphalt, an anionic polymer latex, a super-water-resistant additive, a hydrophobic filler, and an auxiliary agent, wherein if the total mass of the waterproof sealant is 100%, the addition amount of the emulsified asphalt is 15-35%, the addition amount of the anionic polymer latex is 20-45%, the addition amount of the super-water-resistant additive is 1-10%, and the addition amount of the hydrophobic filler is 20-45%; the super-water-resistant additive is an anionic polymer emulsion. Through the synergistic effect of the components and proportions of the waterproof sealant of the present invention, the waterproof sealant has the advantages of environmental friendliness and harmlessness, a high solid content, excellent water resistance, excellent storage stability, high drying speed, excellent construction performance and a simple construction process, adapting to the diversity and complexity of materials at the joints of building components, and ensuring that the product can achieve effective and long-term sealing and waterproofing of different materials at the joints of building components.

Description

A kind of high water resistance environmental protection waterproof sealing paste and its preparation method and application

technical field

The invention belongs to the technical field of waterproof building materials, and in particular relates to a highly water-resistant and environment-friendly waterproof sealant and its preparation method and application.

Background technique

Leakage of buildings is a prominent common defect in building quality, and improper construction of detail nodes is one of the main reasons for building leakage. However, the structure of detail nodes is complex, and there are many kinds of materials, such as cement, aluminum, plastic, glass and other components. Therefore, it is more difficult to deal with the structure of detail nodes.

In the actual construction material selection, ordinary waterproof paint, ointment and other sealing materials are often used to deal with these detailed node structures. Such sealing materials have weak cohesiveness or other physical properties. Shrinkage cracking, long-term manifestations are shelling, warping, brittle cracking, etc. with the bonding surface. The reason is not only related to the composition of the sealing material itself, but also related to the compatibility of the sealing material and the joint base material. If the compatibility between the selected sealing material and the base material is poor on both sides or one side, the interface will be easily peeled off after a long time , forming seepage and leakage channels.

For example, patent CN111793436A discloses a one-component asphalt-based water-based non-curing rubber asphalt waterproof coating, which is mainly prepared from the following components according to the following weight ratio: 10-40 parts of asphalt, 10-40 parts of softened oil, water 30-50 parts, 5-20 parts of anionic polymer latex, 1-3 parts of anionic emulsifier, 1-3 parts of non-ionic emulsifier, 0.1-0.3 part of stabilizer, 0.1-0.3 part of defoamer, 0.1-0 preservative 0.3 parts, thickener 0.1-2.5 parts, inorganic filler 5-15 parts. Although the waterproof coating can have good bonding performance with waterproof coiled materials and various substrates, its own cohesion is small, and the bonding performance index with different substrates deviates, which cannot meet the requirements for use, and its solid content is the highest. It can only reach 68%, and the heat resistance is deviated. The high temperature in summer will cause the product to flow, and the long-term water resistance still needs to be improved.

Therefore, it is necessary to provide an environmentally friendly, harmless, excellent water resistance, high solid content, excellent storage stability, fast drying speed, excellent construction performance, simple construction process, adapt to the diversity and complexity of materials at the joints of building components, and ensure that the product is suitable for use. High water resistance and environmental protection waterproof sealant products that can effectively and permanently seal and waterproof the joints of building components have become a top priority.

Contents of the invention

In order to overcome the problems of poor sealing effect of the existing waterproof sealant, swelling and shrinkage after soaking in water, peeling from the bonded surface, edge warping, brittle cracks, etc., the present invention provides a highly water-resistant and environmentally friendly waterproof sealant and its preparation method and application.

In order to achieve the above purpose, the technical solutions adopted are:

One aspect of the present invention provides a waterproof sealing paste, which includes emulsified asphalt, anionic polymer latex, super water-resistant additives, hydrophobic fillers and auxiliary agents; wherein, the added amount of the emulsified asphalt is 15% of the total mass of the waterproof sealing paste % to 35%; the addition of the anionic polymer latex is 20% to 45% of the total mass of the waterproof sealant paste; the addition of the super water-resistant additive is 1% to 10% of the total mass of the waterproof sealant %; the added amount of the hydrophobic filler is 20-45% of the total mass of the waterproof sealing paste; wherein, the super water-resistant additive is an anionic polymer emulsion.

Preferably, the solid content of the waterproof sealing paste is ≥70%.

Preferably, the super water-resistant additive is one or any of anionic polyethylene wax emulsion, anionic oxidized polyethylene wax emulsion, anionic polypropylene wax emulsion, anionic oxidized polypropylene wax emulsion or anionic polytetrafluoroethylene emulsion Two or more.

Preferably, the added amount of the super water-resistant additive is 3%-8% of the total mass of the waterproof sealing paste.

Preferably, the anionic polymer latex is one or any two or more selected from anionic neoprene latex, anionic styrene-butadiene latex, hydrophobically modified anionic acrylic latex or hydrophobically modified anionic styrene-acrylic latex.

Preferably, the added amount of the anionic polymer latex is 30%-40% of the total mass of the waterproof sealant.

Preferably, the hydrophobic filler is one or any two or more selected from hydrophobically modified nano-calcium carbonate, hydrophobically modified nano-talc powder, hydrophobically modified nano-silica or subnano polytetrafluoroethylene particles .

Preferably, the added amount of the hydrophobic filler is 30-40% of the total mass of the waterproof sealing paste.

Preferably, the emulsified asphalt includes asphalt, water, anionic emulsifier, nonionic emulsifier and stabilizer in a mass ratio of 10-30:8-25:1-3:0.5-1:0.1-0.3.

Further preferably, the mass ratio of the bitumen to the water is 15-20:8-15.

Further preferably, the asphalt is one or any two or more selected from 30# asphalt, 50# asphalt, 70# asphalt, 90# asphalt or 110# asphalt.

Further preferably, the water is one or any two or more selected from distilled water, deionized water, tap water, industrial water or river water.

Further preferably, the anionic emulsifier is one or any two or more selected from alkylbenzenesulfonate emulsifiers, alkylsulfonate emulsifiers or lignosulfonate emulsifiers .

Further preferably, the nonionic emulsifier is one or any two selected from long-chain fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, fatty acid polyoxyethylene ester or polyether emulsifier and above.

Further preferably, the stabilizer is one or any two or more selected from sodium carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose or polyvinyl alcohol.

Preferably, the auxiliary agent includes one or any two or more of defoamers, preservatives, and hydrophobically modified thickeners.

Further preferably, the mass ratio of the defoamer, the preservative, and the hydrophobically modified thickener is 0.1-0.3:0.1-0.3:0.1-2.5.

Further preferably, the defoamer is one or any two selected from mineral oil defoamers, silicone defoamers, polyether defoamers or polysiloxane defoamers and above.

Further preferably, the preservative is selected from one or any two of isothiazolinone preservatives, formaldehyde-releasing preservatives, benzisothiazoline preservatives or s-triazine preservatives and above.

Further preferably, the hydrophobically modified thickener is selected from a hydrophobically modified alkali-swellable thickener, a hydrophobically modified alkali-swellable associative thickener or a hydrophobically modified polyurethane thickener species or any two or more.

The second aspect of the present invention provides a kind of preparation method of described waterproof sealing paste, first make described hydrophobic filler and described anionic polymer latex mix uniformly, then mix with described emulsified asphalt, described super-waterproof additive , and finally add the auxiliary agent and mix evenly to obtain the waterproof sealing paste.

Preferably, the temperature of the mixing process is controlled to be 10-50°C.

Preferably, the emulsified asphalt is prepared through the following steps:

(1) Mix anionic emulsifier, nonionic emulsifier, stabilizer and water evenly to prepare soap, and adjust the pH of the soap to 10-12;

(2) Heat the asphalt to 130-140°C and stir for 0.5-1 hour;

(3) controlling the temperature of the soap solution to be 30 to 80°C, controlling the temperature of the asphalt treated in step (2) to be 100 to 150°C, then mixing and grinding the soap solution and the asphalt for 1 to 3 minutes, and The discharge temperature of the emulsified asphalt is controlled to be 50-95° C., and the emulsified asphalt is obtained by cooling naturally.

The third aspect of the present invention is to provide an application of the waterproof sealant in building waterproof caulking.

Due to the use of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

Through the synergistic effect of the components and proportions of the waterproof sealing paste, the present invention makes the waterproof sealing paste environmentally friendly, high solid content, excellent water resistance, excellent storage stability, fast drying speed, excellent construction performance, simple construction process, Adapt to the diversity and complexity of materials at the joints of building components, and ensure that the product can effectively and permanently seal and waterproof the various materials at the joints of building components.

Detailed ways

Specific embodiments of the present invention will be described below.

The invention provides a waterproof sealing paste, which includes emulsified asphalt, anionic polymer latex, super water-resistant additives, hydrophobic fillers and auxiliary agents; wherein, the added amount of the emulsified asphalt is 15% of the total mass of the waterproof sealing paste ~35%; the addition of the anionic polymer latex is 20% to 45% of the total mass of the waterproof sealant; the addition of the super water-resistant additive is 1% to 10% of the total mass of the waterproof sealant ; The added amount of the hydrophobic filler is 20-45% of the total mass of the waterproof sealing paste; wherein, the super water-resistant additive is an anionic polymer emulsion.

The waterproof sealing paste of the present application is a water-based product, which uses water as a solvent, and is a one-component formula, does not volatilize harmful substances, and is more friendly to the environment and construction personnel. Moreover, the solid content of the waterproof sealing paste can reach 70% or more, such as 70%-80%, and the waterproof sealing paste still has excellent storage stability under high solid content. Because the solid content of the waterproof sealing paste is high, the drying speed is fast, and the waterproof sealing paste can be constructed at normal temperature, thereby saving construction cost. In addition, the waterproof sealant can adapt to the diversity and complexity of materials at the joints of building components, and ensure that the product can effectively and permanently seal and waterproof all kinds of materials at the joints of building components.

According to some embodiments, the super water-resistant additive is preferably made of a polymer with excellent high temperature performance and water resistance, properties close to wax, and a contact angle with water greater than 135°. On the one hand, the super water-resistant additive can be polymerized with asphalt, anion The phenomenon that the molecular chains cross each other through physical blending, etc., makes the waterproof sealant more stable, so that the solid content of the waterproof sealant can be increased as much as possible under the condition of ensuring storage stability; on the other hand, in During the drying process of the waterproof sealant, the resin component in the super water-resistant additive will partially migrate to the surface of the coating, so that the surface of the coating will show a certain lotus leaf effect, so that the coating will be protected from water intrusion, and the waterproof seal will be further improved. Water resistance of paste. According to some preferred embodiments, the super water-resistant additive is one selected from anionic polyethylene wax emulsion, anionic oxidized polyethylene wax emulsion, anionic polypropylene wax emulsion, anionic oxidized polypropylene wax emulsion or anionic polytetrafluoroethylene emulsion. species or any two or more.

Further, the added amount of the super water-resistant additive is 3% to 8% of the total mass of the waterproof sealant, such as 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7% , 7.5%. If the added amount of the super water-resistant additive is too low, the water resistance of the waterproof sealing paste will be insufficient; if the added amount is too high, the bonding performance and low-temperature performance of the waterproof sealing paste and the base material will be affected.

According to some embodiments, the anionic polymer latex is preferably flexible, has good low-temperature performance and rebound performance, excellent water resistance, and a polymer whose properties are closer to rubber. According to some specific and preferred embodiments, the anionic polymer latex is one or any of anionic neoprene latex, anionic styrene-butadiene latex, hydrophobically modified anionic acrylic latex or hydrophobically modified anionic styrene-acrylic latex Two or more.

Further, the amount of the anionic polymer latex added is 30% to 40% of the total mass of the waterproof sealant, such as 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38% %, 39%. If the amount of anionic polymer latex is too low, the low-temperature performance of the waterproof sealant at -10°C is difficult to meet the standard, and the bonding performance with various substrates is also insufficient; if the amount added is too high, it will significantly increase the product’s cost.

According to some embodiments, the hydrophobic filler is one or any two selected from hydrophobically modified nano-calcium carbonate, hydrophobically modified nano-talc powder, hydrophobically modified nano-silica, or subnano polytetrafluoroethylene particles. and above. The preferred hydrophobic filler helps to improve the water resistance and storage stability of the waterproof sealant.

Further, the added amount of the hydrophobic filler is 30-40% of the total mass of the waterproof sealing paste, such as 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39% %. If the amount of hydrophobic filler is too low, the solid content of the waterproof sealant will be low, resulting in prolonged construction time; if the amount of hydrophobic filler is too high, the storage stability of the waterproof sealant will be poor, and various performances of the product will be significantly reduced.

According to some embodiments, the emulsified asphalt is self-configured slow-cracking and slow-setting anionic emulsified asphalt. Preferably, the emulsified asphalt includes asphalt, water, slow-cracking and slow-setting anionic emulsifier, non-ionic emulsifier and stabilizing agent. Further preferably, the mass ratio of the bitumen to the water is 15-20:8-15, more preferably 15-20:8-10.

Among them, the asphalt can be selected according to the specific needs, the convenience of obtaining materials, and the composition of the asphalt. Preferably, the asphalt is one or any two or more selected from 30# asphalt, 50# asphalt, 70# asphalt, 90# asphalt or 110# asphalt.

Further preferably, the anionic emulsifier is a slow-cracking and slow-setting anionic emulsifier with excellent stability and water resistance to metal ions such as Ca ²⁺ and Mg ²⁺ . For example, the anionic emulsifier is one or any two or more selected from alkylbenzenesulfonate emulsifiers, alkylsulfonate emulsifiers or lignosulfonate emulsifiers.

Further preferably, the stabilizer is one or any two or more selected from sodium carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose or polyvinyl alcohol. By using these preferred types of stabilizers, the storage stability of the anionic emulsified asphalt and waterproof sealant can be further improved.

Preferably, the auxiliary agent includes one or any two or more of defoamers, preservatives, and hydrophobically modified thickeners. Further preferably, the mass ratio of the defoamer, the preservative, and the hydrophobically modified thickener is 0.1-0.3:0.1-0.3:0.1-2.5.

Further preferably, the defoamer is one or any two selected from mineral oil defoamers, silicone defoamers, polyether defoamers or polysiloxane defoamers and above. By using these preferred types of defoamers, they can be better coordinated with other components in the formula to further improve the defoaming effect.

Further preferably, the preservative is selected from one or any two of isothiazolinone preservatives, formaldehyde-releasing preservatives, benzisothiazoline preservatives or s-triazine preservatives and above. The preferred type of preservative is better coordinated with other components in the formula to make the preservative effect better.

Further preferably, the hydrophobically modified thickener is selected from a hydrophobically modified alkali-swellable thickener, a hydrophobically modified alkali-swellable associative thickener or a hydrophobically modified polyurethane thickener species or any two or more. The preferred hydrophobically modified thickener adjusts the viscosity and water resistance of the waterproof sealant, and is low in cost.

The preparation method of waterproof sealing paste of the present invention comprises the following steps:

1) Weigh each raw material respectively according to the weight and number ratio, then add anionic emulsifier, nonionic emulsifier and stabilizer into water and mix well, and prepare soap liquid, then adjust the pH value of the soap liquid to 10- 12, standby;

2) Heat the asphalt to 130-140°C, stir for 0.5-1 hour, and set aside;

3) Mix and grind the soap solution obtained in step 1) and the asphalt obtained in step 2) through a colloid mill for 1-3 minutes, and cool down to room temperature naturally to obtain emulsified asphalt;

4) Slowly add the super water-resistant filler into the anionic polymer latex, mix the two evenly, and obtain the modified anionic polymer latex;

5) Slowly add the emulsified asphalt prepared in step 3) to the modified anionic polymer latex prepared in step 4), and add super water-resistant additives, mix well; then add defoamer and preservative to it, mix well; then slowly Add a hydrophobic modified thickener and mix evenly to obtain a highly water-resistant and environmentally friendly waterproof sealant.

Preferably, in step (1), the pH value of the soap solution is preferably adjusted with an aqueous NaOH solution with a mass concentration percentage of 8-12%.

Preferably, in step 3), the temperature of the soap liquid is 30-80° C. before being mixed and ground by the colloid mill by heating, and the temperature of the modified asphalt is 100-150° C. before being mixed and ground by the colloid mill ; During the mixing and grinding process of the colloid mill, the discharge temperature of the emulsified asphalt is controlled to be 50-95°C.

Preferably, in step 4) and step 5), the temperature of the mixing process is respectively controlled between 10-50°C.

The preferred temperature parameters make the performance of the waterproof sealing paste more excellent.

The preparation procedure of the waterproof sealing paste of the present invention is simple and convenient, and takes less time. Among them, the optimized process parameters ensure the full interaction of the various components of the waterproof coating and ensure the excellent performance of the waterproof sealing paste.

Compared with the prior art, the waterproof sealing paste of the present invention has the following advantages:

(1) The high water resistance and environmental protection waterproof sealing paste of the present application is a new type of water-based environmental protection building waterproof sealing product, which can be applied by scraping at room temperature, has excellent anti-sag performance and storage stability, and has excellent adhesion to different substrates. knot performance, fast drying performance and excellent water resistance;

(2) The high water resistance and environmental protection waterproof sealing paste has high solid content, fast water volatilization speed, and short drying time. It has excellent bonding performance with asphalt-based waterproof membranes and various substrates such as cement, aluminum plates, and plastics, and is especially suitable for construction. Waterproof caulking construction; and the construction process is simple, environmentally friendly, non-toxic and non-polluting, it is a "seven-point product, three-point construction" product;

(3) The highly water-resistant and environmentally friendly waterproof sealing paste uses water as a solvent and does not contain harmful organic volatile solvents such as benzene, toluene, and xylene. The product is green, environmentally friendly, and pollution-free, and has no health hazards to construction workers.

The technical solutions of the present invention will be described in detail below in conjunction with specific examples, so that those skilled in the art can better understand and implement the technical solutions of the present invention, but the present invention is not therefore limited to the scope of the examples.

The raw materials in the following examples can be obtained commercially, and the solid content of latex, emulsion and other raw materials can be selected according to the needs, as long as the solid content of the waterproof sealant can reach 70% or more.

comparative example

A highly water-resistant and environmentally friendly waterproof sealing paste in this example is mainly prepared from the following components according to the following weight and part ratios:

The preparation method of the highly water-resistant environmental protection waterproof sealant comprises the following steps carried out in sequence:

1) Weigh each raw material respectively according to the weight and number ratio, then add carboxylate emulsifier, long-chain fatty alcohol polyoxyethylene ether and carboxymethyl cellulose sodium into distilled water and mix well, and prepare soap liquid, Then adjust the pH value of the soap solution to 11;

2) Heat 70# asphalt to 135°C, stir for 0.8 hours, and set aside;

3) Mix and grind the soap liquid obtained in step 1) and the asphalt obtained in step 2) through a colloid mill for 1 min, and cool down to room temperature naturally to obtain emulsified asphalt;

4) Calcium carbonate is slowly added in the anionic acrylic latex, and the two are mixed uniformly to obtain the modified anionic polymer latex;

5) Slowly add the emulsified asphalt prepared in step 3) to the modified anionic polymer latex prepared in step 4), and mix uniformly; then add mineral oil defoamer and isothiazolinone preservative to it, and mix uniformly; Then slowly add polyacrylic acid thickener and mix evenly to obtain waterproof sealing paste.

In step 3), the temperature of the soap liquid before being mixed and ground by the colloid mill is 60° C. by heating, and the temperature of the modified asphalt is 120° C. before being mixed and ground by the colloid mill; The discharge temperature of the emulsified asphalt is controlled to be 80° C.; the temperature of the mixing process is respectively controlled between 30° C. in step 4) and step 5).

Example 1

A highly water-resistant and environmentally friendly waterproof sealing paste according to the present invention is mainly prepared from the following components according to the following weight and part ratios:

1) Weigh each raw material according to the weight and number ratio, and then add alkylbenzene sulfonate emulsifier, long-chain fatty alcohol polyoxyethylene ether and sodium carboxymethyl cellulose into distilled water and mix evenly to prepare Soap, after which the pH of the soap is adjusted to 11;

2) Heat 30# asphalt to 135°C, stir for 0.8 hours, and set aside;

3) Mix and grind the soap liquid obtained in step 1) and the asphalt obtained in step 2) through a colloid mill for 2 minutes, and cool down to room temperature naturally to obtain emulsified asphalt;

4) slowly adding hydrophobically modified nano-calcium carbonate into the anionic neoprene latex, mixing the two evenly, and adding anionic polyethylene wax emulsion, stirring evenly to obtain a modified anionic polymer latex;

5) Slowly add the emulsified asphalt prepared in step 3) to the modified anionic polymer latex prepared in step 4), and mix uniformly; then add mineral oil defoamer and isothiazolinone preservative to it, and mix uniformly; Then slowly add the hydrophobically modified alkali-swellable thickener and mix evenly to obtain a highly water-resistant and environmentally friendly waterproof sealant.

Example 2

1) Weigh each raw material according to the weight and part ratio, then add alkylsulfonate emulsifier, alkylphenol polyoxyethylene ether and hydroxyethyl cellulose into deionized water and mix well, and prepare soap solution , and then adjust the pH value of the soap solution to 10;

2) Heat 50# asphalt to 140°C, stir for 0.5 hours, and set aside;

3) Mix and grind the soap solution obtained in step 1) and the asphalt obtained in step 2) through a colloid mill for 3 minutes, and cool down to room temperature naturally to obtain emulsified asphalt;

4) slowly adding hydrophobically modified nano-talc powder into the anionic styrene-butadiene latex, mixing the two evenly, and adding an anionic polypropylene wax emulsion, stirring evenly to obtain a modified anionic polymer latex;

5) Slowly add the emulsified asphalt prepared in step 3) to the modified anionic polymer latex prepared in step 4), and mix evenly; then add a silicone defoamer and a formaldehyde-releasing preservative to it, mix evenly; then slowly Add hydrophobically modified alkali-swellable associative thickener and mix evenly to obtain a highly water-resistant and environmentally friendly waterproof sealant.

In step 3), the temperature of the soap liquid before passing through the colloid mill for mixing and grinding is 30°C by heating, and the temperature of the modified asphalt before passing through the colloid mill for mixing and grinding is 150°C; during the mixing and grinding process of the colloid mill The discharge temperature of the emulsified asphalt is controlled to be 50° C.; the temperature of the mixing process is respectively controlled between 50° C. in step 4) and step 5).

Example 3

1) Weigh each raw material respectively according to the weight and number ratio, then add lignosulfonate emulsifier, polyoxyethylene fatty acid ester and hydroxypropyl methylcellulose into tap water and mix well, and prepare soap liquid, Then adjust the pH value of the soap solution to 12;

2) Heat 70# asphalt to 130-140°C, stir for 1 hour, and set aside;

4) slowly adding hydrophobically modified nano-silica to hydrophobically modified anionic acrylic latex, mixing the two evenly, adding anionic polytetrafluoroethylene emulsion, and stirring evenly to obtain modified anionic polymer latex;

5) Slowly add the emulsified asphalt prepared in step 3) to the modified anionic polymer latex prepared in step 4), and mix evenly; then add polyether defoamer and benzisothiazoline preservative to it, and mix evenly ; Slowly add the hydrophobically modified polyurethane thickener and mix evenly to obtain a highly water-resistant and environmentally friendly waterproof sealant.

In step 3), the temperature of the soap liquid before being mixed and ground by the colloid mill is 80° C. by heating, and the temperature of the modified asphalt is 100° C. before being mixed and ground by the colloid mill; The discharge temperature of the emulsified asphalt is controlled to be 95° C.; the temperature of the mixing process is controlled between 10° C. in step 4) and step 5).

Example 4

A high water resistance and environmental protection waterproof sealing paste according to the present invention is mainly prepared from the following components according to the following ratios by weight and number:

1) Weigh each raw material respectively according to the ratio of parts by weight, then add alkylbenzenesulfonate emulsifier, polyether emulsifier and polyvinyl alcohol into industrial water and mix evenly, and prepare soap liquid, then put The pH value of the soap is adjusted to 10;

2) Heat 90# asphalt to 130°C, stir for 1 hour, and set aside;

3) Mix and grind the soap solution obtained in step 1) and the modified asphalt obtained in step 2) through a colloid mill for 2 minutes, and cool down to room temperature naturally to obtain emulsified asphalt;

4) Slowly add subnanometer polytetrafluoroethylene particles into the hydrophobically modified anionic styrene-acrylic latex, mix the two evenly, add anionic polyethylene wax emulsion, and stir evenly to obtain a modified anionic polymer latex;

5) Slowly add the emulsified asphalt prepared in step 3) to the modified anionic polymer latex prepared in step 4), and mix uniformly; then add polysiloxane defoamer and s-triazine preservative to it, and mix uniformly ; Then slowly add hydrophobically modified alkali-swellable thickener and mix evenly to obtain a highly water-resistant and environmentally friendly waterproof sealant.

In step 3), the temperature of the soap liquid before being mixed and ground by the colloid mill is 80° C. by heating, and the temperature of the modified asphalt is 100° C. before being mixed and ground by the colloid mill; The discharge temperature of the emulsified asphalt is controlled to be 50° C.; the temperature of the mixing process is respectively controlled between 50° C. in step 4) and step 5).

Example 5

1) Weigh each raw material according to the weight and part ratio, and then add alkyl sulfonate emulsifier, long-chain fatty alcohol polyoxyethylene ether, and hydroxyethyl cellulose into river water and mix evenly, and prepare soap liquid , and then adjust the pH value of the soap to 12;

2) Heat 110# asphalt to 130°C, stir for 1 hour, and set aside;

3) The soap solution obtained in step 1) is mixed with the asphalt obtained in step 2) for 1 min through a colloid mill, and the temperature is naturally cooled to room temperature to obtain emulsified asphalt;

4) Slowly add hydrophobically modified nano-silica to hydrophobically modified anionic acrylic latex, mix the two evenly, add anionic polyethylene wax emulsion, stir evenly, and obtain modified anionic polymer latex;

5) Slowly add the emulsified asphalt prepared in step 3) to the modified anionic polymer latex prepared in step 4), and mix evenly; then add a silicone defoamer and an isothiazolinone preservative to it, and mix evenly; Then slowly add the hydrophobically modified alkali-swellable associative thickener and mix evenly to obtain a highly water-resistant and environmentally friendly waterproof sealant.

Performance test experimental data:

1. Performance test of high water resistance, environmental protection and waterproof sealant

1) According to the detection method in the standard JGT 501-2016 "Waterproof sealant for joints of building components", GBT 16777-2008 "Test method for building waterproof coatings" and JC1066-2008 "Limits of harmful substances in building waterproof coatings", each embodiment The high water-resistant environmental protection waterproof sealant was tested for relevant indicators, and the test results are shown in Table 1:

Table 1 Performance test results of high water resistance and environmental protection waterproof sealant

From the test results of the bonding performance parameters in Table 1, it can be seen that the high water resistance and environmental protection waterproof sealant in this case has excellent bonding performance with various construction bases (base surfaces).

2) In addition, the highly water-resistant, environmentally-friendly and waterproof sealing pastes of each embodiment were stored in airtight storage at room temperature for 6 months, without demulsification, gelation, caking and other adverse phenomena, and their storage stability was excellent.

2. High water resistance and environmental protection waterproof sealing paste water resistance performance test

Select the comparison ratio and the product performance of Examples 1-5 to compare, wherein the water absorption performance index is tested according to the method of 6.15 in GBT19250-2013 "Polyurethane Waterproof Coating", and the bond strength retention performance index is according to JGT501-2016 "Building Components The sample prepared according to the method in 6.8.1.1 of "Joint Waterproof Sealant" is immersed in water at a temperature of 23±2°C. After standing for a specified time, the sample is taken out of the water and dried, and placed at a temperature of 23±2°C for 4 hours. Then perform a performance test. It can be seen from Table 2 that the product of the present application has excellent water resistance, and the water resistance can basically reach the standard of oily polyurethane products.

Table 2 Water resistance performance test results of high water resistance and environmental protection waterproof sealant

3. Product harmful substance limit test

Table 3 Test results of product harmful substances limit

It can be seen from Table 3 that the volatile harmful substances in the product in this case are extremely small, and it is absolutely safe and environmentally friendly.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Neither the endpoints nor any values of the ranges disclosed herein are limited to such precise ranges or values, and these ranges or values are understood to include values approaching these ranges or values. For numerical ranges, between the endpoints of each range, between the endpoints of each range and individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges, these values Ranges should be considered as specifically disclosed herein.

Claims

A waterproof sealing paste, characterized in that: it includes emulsified asphalt, anionic polymer latex, super water-resistant additives, hydrophobic fillers and auxiliary agents; wherein, the added amount of the emulsified asphalt is 15% of the total mass of the waterproof sealing paste ~35%; the addition of the anionic polymer latex is 20% to 45% of the total mass of the waterproof sealant; the addition of the super water-resistant additive is 1% to 10% of the total mass of the waterproof sealant ; The added amount of the hydrophobic filler is 20-45% of the total mass of the waterproof sealing paste; wherein, the super water-resistant additive is an anionic polymer emulsion.
The waterproof sealing paste according to claim 1, characterized in that: the solid content of the waterproof sealing paste is ≥70%.
The waterproof sealing paste according to claim 1, characterized in that: the super water-resistant additive is selected from anionic polyethylene wax emulsion, anionic oxidized polyethylene wax emulsion, anionic polypropylene wax emulsion, anionic oxidized polypropylene wax emulsion or anionic One or any two or more of the polytetrafluoroethylene emulsions; and/or, the added amount of the super water-resistant additive is 3% to 8% of the total mass of the waterproof sealing paste.
The waterproof sealing paste according to claim 1, characterized in that: the anionic polymer latex is selected from anionic chloroprene latex, anionic styrene-butadiene latex, hydrophobically modified anionic acrylic latex or hydrophobically modified anionic styrene-acrylic latex One or any two or more of them; and/or, the added amount of the anionic polymer latex is 30% to 40% of the total mass of the waterproof sealant.
The waterproof sealing paste according to claim 1, characterized in that: the hydrophobic filler is selected from hydrophobic modified nano calcium carbonate, hydrophobic modified nano talcum powder, hydrophobic modified nano silicon dioxide or subnano polytetrafluoroethylene One or any two or more of the particles; and/or, the added amount of the hydrophobic filler is 30-40% of the total mass of the waterproof sealant.
The waterproof sealing paste according to claim 1, characterized in that: the emulsified asphalt comprises asphalt, water, and anionic emulsifier in a mass ratio of 10-30:8-25:1-3:0.5-1:0.1-0.3 , Nonionic emulsifier and stabilizer.
The waterproof sealing paste according to claim 6, characterized in that: the mass ratio of the asphalt to the water is 15-20:8-15.
The waterproof sealing paste according to claim 6 or 7, characterized in that: the asphalt is one or any two selected from 30# asphalt, 50# asphalt, 70# asphalt, 90# asphalt or 110# asphalt and above; and/or,

The water is one or any two or more selected from distilled water, deionized water, tap water, industrial water or river water; and/or,

The anionic emulsifier is one or any two or more selected from alkylbenzenesulfonate emulsifiers, alkylsulfonate emulsifiers or lignosulfonate emulsifiers; and/or ,

The nonionic emulsifier is one or any two or more selected from long-chain fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, fatty acid polyoxyethylene ester or polyether emulsifier; and /or,

The stabilizer is one or any two or more selected from sodium carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose or polyvinyl alcohol.
The waterproof sealing paste according to claim 1, wherein the auxiliary agent includes one or any two or more of defoamers, preservatives, and hydrophobically modified thickeners.
The waterproof sealing paste according to claim 9, characterized in that: the mass ratio of the defoamer, the preservative, and the hydrophobically modified thickener is 0.1-0.3:0.1-0.3:0.1-2.5 ;and / or,

The defoamer is one or any two or more selected from mineral oil defoamers, silicone defoamers, polyether defoamers or polysiloxane defoamers; and /or,

The preservative is one or any two or more selected from isothiazolinone preservatives, formaldehyde-releasing preservatives, benzisothiazoline preservatives or s-triazine preservatives; and/ or,

The hydrophobically modified thickener is selected from one or any two of hydrophobically modified alkali-swellable thickeners, hydrophobically modified alkali-swellable associative thickeners or hydrophobically modified polyurethane thickeners. species and above.
A kind of preparation method as described in any one of claims 1 to 10 waterproof sealing paste, it is characterized in that: first make described hydrophobic filler and described anionic polymer latex mix homogeneously, then mix with described emulsified asphalt, The super water-resistant additive is mixed uniformly, and finally the auxiliary agent is added and mixed uniformly to obtain the waterproof sealing paste.
The preparation method according to claim 11, characterized in that: the temperature of the mixing process is controlled to be 10-50°C.
The preparation method according to claim 11, characterized in that: the emulsified asphalt is prepared through the following steps:

(1) Mix anionic emulsifier, nonionic emulsifier, stabilizer and water evenly to prepare soap, and adjust the pH of the soap to 10-12;

(2) Heat the asphalt to 130-140°C and stir for 0.5-1 hour;

(3) controlling the temperature of the soap solution to be 30 to 80°C, controlling the temperature of the asphalt treated in step (2) to be 100 to 150°C, then mixing and grinding the soap solution and the asphalt for 1 to 3 minutes, and The discharge temperature of the emulsified asphalt is controlled to be 50-95° C., and the emulsified asphalt is obtained by cooling naturally.
An application of the waterproof sealing paste according to any one of claims 1 to 10 in building waterproof caulking.