Water-based self-healing non-curing rubber asphalt waterproof coating and preparation method thereof

Abstract

The invention discloses a water-based self-healing type non-curing rubber asphalt waterproof coating and a preparation method thereof, and belongs to the technical field of building waterproof materials. The invention discloses a non-cured waterproof coating which comprises the following components in parts by weight: 3300-3500 parts of anionic emulsified asphalt, 450-550 parts of anionic neoprene latex (511A type), 950-1050 parts of acrylate emulsion (515 type), 110-130 parts of a self-healing functional aid group, 4-8 parts of caustic soda No.3 and 3-7 parts of a wetting agent. The non-cured waterproof coating has the advantages of low VOC emission, good low-temperature toughness and strong compatibility with coiled materials, and solves the problems that the existing non-cured waterproof coating has excessive VOC and is not easy to crack, and the service life of the non-cured waterproof coating is prolonged. The problems that indoor air quality and human health are affected, low-temperature toughness is poor, application in cold regions is limited, compatibility with coiled materials is insufficient, and water is prone to permeating and flowing on an interface to form water channeling are solved.

Description

Technical Field

[0001] This invention belongs to the field of building waterproofing materials technology, and particularly relates to water-based self-healing non-curing rubber asphalt waterproof coating and its preparation method. Background Technology

[0002] Non-curing waterproof coatings are a special type of waterproof material. They are paste-like and never harden. Unlike traditional curing waterproof coatings, non-curing waterproof coatings do not harden or become brittle over time. They have excellent self-healing capabilities. When the coating is damaged by external forces and cracks or breaks, it can automatically repair itself by its own adhesion and fluidity, maintaining its waterproof effect. Its strong adhesion allows it to firmly adhere to various substrate surfaces, such as concrete and brick, forming a seamless waterproof membrane. Whether it is waterproofing projects for buildings such as roofs, basements, and tunnels, or waterproofing infrastructure such as bridges and subways, non-curing waterproof coatings play an important role in waterproofing due to their unique properties.

[0003] Existing non-curing waterproof coatings generally have the following problems: 1. Solvent-based products have excessive VOC levels, which affects indoor air quality and human health, and also pollutes the atmospheric environment, limiting their application in places with high environmental protection requirements.

[0004] 2. Water-based products have poor low-temperature toughness and are prone to cracking at -5℃. This is because water freezes and expands at low temperatures, damaging the coating structure and reducing the flexibility of the film-forming material, which limits their application in cold regions.

[0005] 3. Insufficient compatibility with the roll material leads to water seepage. With a peel strength ≤0.8MPa, water can easily penetrate and flow at the interface, reducing the waterproofing effect, corroding the building structure, and increasing the difficulty of maintenance. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention provides a water-based self-healing non-curing rubber asphalt waterproof coating and its preparation method. It has the advantages of low VOC emissions, good low-temperature toughness, and strong compatibility with roofing membranes. It solves the problems of existing non-curing waterproof coatings, such as excessive VOCs affecting indoor air quality and human health, poor low-temperature toughness limiting its application in cold regions, and insufficient compatibility with roofing membranes, which makes it easy for water to penetrate and flow at the interface, causing water seepage.

[0007] This invention is achieved as follows: a water-based self-healing non-curing rubber asphalt waterproof coating and its preparation method, comprising the following components by weight: Anionic emulsified asphalt 3300-3500 parts, anionic chloroprene latex (type 511A) 450-550 parts, acrylic emulsion (type 515) 950-1050 parts, self-healing functional additive group 110-130 parts, caustic soda No. 3 4-8 parts, wetting agent 3-7 parts.

[0008] As a preferred embodiment of the present invention, the self-healing functional aid group comprises the following components: Water-based No. 4 feed: 45-55 parts; Water-based No. 5 feed (Type 206): 42-50 parts; Water-based No. 2 feed (Type 104): 2-3 parts; Water-based No. 1 feed: 8-12 parts.

[0009] As a preferred embodiment of the present invention, the water-based No. 4 material is a tackifying resin, the water-based No. 5 material (type 206) is an oxidation inhibitor, the water-based No. 2 material (type 104) is an anionic stabilizer, and the water-based No. 1 material is a curing delay agent.

[0010] As a preferred embodiment of the present invention, the glass transition temperature Tg of the anionic chloroprene latex (type 511A) is -45°C, the glass transition temperature Tg of the acrylate emulsion (type 515) is 10°C, and the weight ratio of the anionic chloroprene latex (type 511A) to the acrylate emulsion (type 515) is 3:2.

[0011] A method for preparing a water-based self-healing non-curing rubber asphalt waterproof coating includes the following steps: Step S1: Heat the anionic emulsified asphalt to 48-52℃, keep it warm and stir until the system is homogeneous; Step S2: Add anionic chloroprene latex (type 511A) and acrylate emulsion (type 515) to the anionic emulsified asphalt, and stir at a low speed of 280-320 rpm for 15-20 minutes to form a latex-asphalt composite base material. Step S3: Mix the tackifying resin, oxidation inhibitor, anionic stabilizer and curing delay agent to form a self-healing functional additive group; Step S4: Add the self-healing functional additive component to the latex-asphalt composite base in three batches, with an interval of 8-12 minutes between each addition. After each addition, stir at 280-320 rpm for 5-8 minutes. Step S5: Add wetting agent and stir for 5-10 minutes; Step S6: Add caustic soda No. 3, adjust the pH value to 10.5±0.5, and continue stirring for 10-15 minutes to obtain the waterproof coating.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention breaks through the bottleneck of low-temperature embrittlement of water-based non-curing coatings by compounding low-Tg anionic chloroprene latex (-45℃) and medium-Tg acrylic emulsion (10℃) in a 3:2 ratio.

[0013] 2. This invention utilizes the anionic response characteristics of water-based No. 2 material (Mair 104 type) and the activation effect of caustic soda No. 3 to achieve automatic crack sealing, and its technical features are different from existing light or heat-triggered repair mechanisms.

[0014] 3. The present invention uses a wetting agent to make the contact angle of the coating on the surface of the roll material ≤15°, forming a molecular-level interpenetrating network of "asphalt-latex-roll material". Detailed Implementation

[0015] To further understand the invention's content, features, and effects, the following embodiments are provided.

[0016] The water-based self-healing non-curing rubber asphalt waterproof coating and its preparation method provided in this invention comprise the following components by weight: 3300-3500 parts of anionic emulsified asphalt, used as a base material, with a solid content ≥60%; Anionic chloroprene latex (type 511A) 450-550 parts and acrylic emulsion (type 515) 950-1050 parts, through the synergistic toughening of the two latexes, achieve complementary glass transition temperatures; The self-healing functional additive group consists of 110-130 parts, with a quaternary composite design to achieve a self-healing system. 4-8 parts of caustic soda No. 3 are used as a pH adjuster to control the pH of the system to 10-11 and activate the anion activity. Add 3-7 parts of wetting agent to enhance interfacial penetration and reduce the interfacial tension of the roll material to ≤25mN / m.

[0017] Furthermore, the self-healing functional aid group comprises the following components: Water-based No. 4 feed: 45-55 parts; Water-based No. 5 feed (Type 206): 42-50 parts; Water-based No. 2 feed (Type 104): 2-3 parts; Water-based No. 1 feed: 8-12 parts.

[0018] Furthermore, the water-based No. 4 material is a tackifying resin, the water-based No. 5 material (type 206) is an oxidation inhibitor, the water-based No. 2 material (type 104) is an anionic stabilizer, and the water-based No. 1 material is a curing delay agent.

[0019] Furthermore, the glass transition temperature Tg of the anionic chloroprene latex (type 511A) is -45°C (providing low-temperature flexibility), the glass transition temperature Tg of the acrylate emulsion (type 515) is 10°C (imparting cohesive strength), and the weight ratio of the anionic chloroprene latex (type 511A) to the acrylate emulsion (type 515) is 3:2.

[0020] Double latex phase change synergistic technology A unique 3:2 blending ratio of anionic chloroprene latex (type 511A) to acrylic emulsion (type 515): In the low-temperature zone (-20℃), the molecular chain segment movement of anionic chloroprene latex (type 511A) prevents brittleness; In the high-temperature zone (60℃), the acrylic emulsion (type 515) forms a physical cross-linking network to resist flow. Compared to single latex systems, the elastic recovery rate is increased to 98%.

[0021] Anionic self-healing system Anion stabilizers and caustic soda No. 3 are used to construct a "dynamic anion channel": When exposed to water, it releases negatively charged groups (-COO⁻) that attract calcium ions (Ca). 2 ⁺); Automatically fills cracks ≤0.3mm (self-healing efficiency ≥85%).

[0022] The tackifying resin and oxidation inhibitor form an "oxidation-tackifying" balanced layer: It slows down the aging rate of asphalt by 300% (mass loss ≤1.5% after 3000h of UV aging).

[0023] Example 1: Preparation of Waterproof Coating Raw material preparation (by weight kg): 3400 kg of anionic emulsified asphalt, 500 kg of anionic chloroprene latex (type 511A), 1000 kg of acrylic emulsion (type 515), 123.5 kg of self-healing functional additive group (50 kg of tackifying resin, 46 kg of oxidation inhibitor, 2.5 kg of anionic stabilizer, 10 kg of curing delay agent), 6 kg of caustic soda No. 3, and 5 kg of wetting agent.

[0024] Preparation steps: Step S1: Add 3400 kg of anionic emulsified asphalt to the reactor, heat to 50°C, and stir at 180 rpm for 5 min. Step S2: Add 500 kg of anionic chloroprene latex (type 511A) and 1000 kg of acrylic emulsion (type 515) to the anionic emulsified asphalt, and stir at a low speed of 300 rpm for 15 min to form a latex-asphalt composite base material. Step S3: Mix 50kg of tackifying resin, 46kg of oxidation inhibitor, 2.5kg of anionic stabilizer and 10kg of curing delay agent to form a self-healing functional aid group; Step S4: Add 123.5 kg of self-healing functional additive components to the latex-asphalt composite base in three batches, with a 10-minute interval between each addition. After each addition, stir at 300 rpm for 8 minutes. Step S5: Add 5 kg of wetting agent and stir at 300 rpm for 5 minutes; Step S6: Add 6 kg of caustic soda No. 3, adjust the pH value to 10.5, and continue stirring for 10 minutes to obtain the waterproof coating.

[0025] Technical effect comparison: It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water-based self-healing non-curing rubber asphalt waterproof coating, characterized in that, By weight, it contains the following components: Anionic emulsified asphalt 3300-3500 parts, anionic chloroprene latex (type 511A) 450-550 parts, acrylic emulsion (type 515) 950-1050 parts, self-healing functional additive group 110-130 parts, caustic soda No. 3 4-8 parts, wetting agent 3-7 parts.

2. The water-based self-healing non-curing rubber asphalt waterproof coating as described in claim 1, characterized in that, The self-healing functional adjuvant group comprises the following components: Water-based No. 4 feed: 45-55 parts; Water-based No. 5 feed (Type 206): 42-50 parts; Water-based No. 2 feed (Type 104): 2-3 parts; Water-based No. 1 feed: 8-12 parts.

3. The water-based self-healing non-curing rubber asphalt waterproof coating as described in claim 2, characterized in that: The water-based No. 4 material is a tackifying resin, the water-based No. 5 material (type 206) is an oxidation inhibitor, the water-based No. 2 material (type 104) is an anionic stabilizer, and the water-based No. 1 material is a curing delay agent.

4. The water-based self-healing non-curing rubber asphalt waterproof coating as described in claim 1, characterized in that: The glass transition temperature (Tg) of the anionic chloroprene latex (type 511A) is -45℃, the glass transition temperature (Tg) of the acrylate emulsion (type 515) is 10℃, and the weight ratio of the anionic chloroprene latex (type 511A) to the acrylate emulsion (type 515) is 3:

2.

5. The preparation method of the water-based self-healing non-curing rubber asphalt waterproof coating according to any one of claims 1-4, characterized in that, Includes the following steps: Step S1: Heat the anionic emulsified asphalt to 48-52℃, keep it warm and stir until the system is homogeneous; Step S2: Add anionic chloroprene latex (type 511A) and acrylate emulsion (type 515) to the anionic emulsified asphalt, and stir at a low speed of 280-320 rpm for 15-20 minutes to form a latex-asphalt composite base material. Step S3: Mix the tackifying resin, oxidation inhibitor, anionic stabilizer and curing delay agent to form a self-healing functional additive group; Step S4: Add the self-healing functional additive component to the latex-asphalt composite base in three batches, with an interval of 8-12 minutes between each addition. After each addition, stir at 280-320 rpm for 5-8 minutes. Step S5: Add wetting agent and stir for 5-10 minutes; Step S6: Add caustic soda No. 3, adjust the pH value to 10.5±0.5, and continue stirring for 10-15 minutes to obtain the waterproof coating.

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