CN-122011999-A - Environment-friendly sealing glue for water supply network threading connector and preparation process thereof

Abstract

The invention discloses environment-friendly sealing glue for a water supply network threading connector and a preparation process thereof. The aqueous isocyanate environment-friendly curing agent is prepared by taking aqueous polyurethane resin as an environment-friendly base material, matching nano silicon dioxide and talcum powder with a mass ratio of 2-5:1, compounding modified filler, plant extract modified bio-based tackifier, and the balance of deionized water, wherein the preparation process comprises the steps of modified filler drying, base material dispersing, component gradient rotating speed mixing, curing optimization and viscosity control, standing and soaking removal, and the aqueous isocyanate environment-friendly curing agent is low in VOCs content, environment-friendly, free of pungent smell, excellent in sealing durability, low in interface leakage rate, capable of being constructed under a micro-wetting working condition, simple in preparation and application process, free of special equipment, low in comprehensive construction cost, suitable for sealing mantle fiber joints of multi-material pipelines and newly-built water supply pipes in old communities, capable of effectively improving stability of a water supply system, and reducing later operation and maintenance costs.

Inventors

• SONG QIANG
• YANG LU
• LIANG PAN
• CHEN XIAODONG
• WANG YI
• ZHANG CHENGFA
• WU WEIMING
• HE WEI
• LI ZHIJUN
• LUAN XIAOTIAN
• LUO YIZHOU

Assignees

• 中交广州航道局有限公司
• 中交广航局第三工程有限公司

Dates

Publication Date

20260512

Application Date

20260318

Claims (10)

1. 1. The environment-friendly sealing glue for the water supply pipe network threading connector is characterized by comprising, by mass, 40% -50% of an environment-friendly base material, 20% -30% of a modified filler, 5% -10% of a bio-based tackifier, 3% -8% of an environment-friendly curing agent, 2% -5% of a functional auxiliary agent and the balance deionized water, wherein the environment-friendly base material is water-based polyurethane resin, the modified filler is a compound of nano silicon dioxide and talcum powder, the bio-based tackifier is formed by modifying a plant extract, and the environment-friendly curing agent is water-based isocyanate.
2. 2. The environment-friendly sealing glue for the water supply network threading connector of claim 1, wherein the particle size of the modified filler is less than or equal to 50nm, and the functional auxiliary agent is compounded by a food-grade preservative, an anti-aging agent and a defoaming agent.
3. 3. The environment-friendly sealing glue for the water supply network threading connector according to claim 1 or 2, wherein the mass ratio of nano silicon dioxide to talcum powder is 2-5:1.
4. 4. The environment-friendly sealing glue for the water supply network threading connector according to claim 1 or 2, wherein the bio-based tackifier is one or more of maleic anhydride modified rosin ester, hydrogenated rosin polyethylene glycol ester, hydroxypropyl methyl cellulose ether, propylene oxide modified lignin and acetylated modified acacia.
5. 5. The environment-friendly sealing glue for the water supply network threading connector of claim 2 is characterized in that the food-grade preservative is one or more of sodium benzoate, calcium benzoate, potassium sorbate and sodium sorbate, the anti-aging agent is one or more of antioxidant 264 (BHT), antioxidant 1010, antioxidant 1076, thiodipropionate and phosphite esters, and the antifoaming agent is one or more of silicone emulsion, polydimethylsiloxane, polyoxypropylene glycerol ether, polyoxypropylene ethylene oxide glycerol ether and DSA-5.
6. 6. A process for preparing environment-friendly sealing glue for a water supply network threading joint according to any one of claims 1-5 is characterized by comprising the following steps of S1, pretreatment, S2, base material dispersion, S3, component mixing, S4, curing and optimizing, wherein the modified filler and the biological base tackifier are sequentially added into the dispersion system, stirring is carried out at a rotating speed, the filler is uniformly dispersed, the environment-friendly curing agent and the functional auxiliary agent are added, the rotating speed is regulated, stirring is carried out, and standing and defoaming are carried out, so that the finished sealing glue is obtained.
7. 7. The preparation process according to claim 6, wherein the rotation speed of the high-speed disperser in the step S2 is 600-900r/min, the stirring time is 10-30 min, the rotation speed of the high-speed disperser in the step S3 is raised to 1000-1500r/min, the stirring time is 20-50 min, the rotation speed of the high-speed disperser in the step S4 is regulated to 400-800r/min, and the stirring time is 10-30 min.
8. 8. The preparation process according to claim 6, wherein the temperature of the drying treatment in the step S1 is 50-100 ℃, the drying time is 1-5 hours, the viscosity of the finished sealing glue is controlled to be 5000-8000 mPa.s after stirring in the step S4, and the standing and defoaming time is 5-30 minutes.
9. 9. An application process of environment-friendly sealing glue for a water supply network threading connector according to any one of claims 1-5 is characterized by comprising the following steps of S1, interface pretreatment, S2, gluing, namely uniformly smearing the sealing glue on the inner wall of the threading connector and the outer surface of the pipeline interface, controlling the gluing thickness, S3, connection and solidification, namely inserting a pipeline into the threading connector, screwing and fixing, standing at room temperature to finish primary solidification, and standing until complete solidification, S4, quality detection, namely carrying out a hydraulic test on the solidified connector, and judging whether the sealing is qualified.
10. 10. The application process according to claim 9, wherein the standing time at room temperature in the step S3 is 15-30 minutes to complete the primary curing, the standing time for complete curing is 24 hours, the test pressure of the water pressure test in the step S4 is 1.6MPa, the dwell time is 30 minutes, and no leakage is the seal is qualified.

Description

Environment-friendly sealing glue for water supply network threading connector and preparation process thereof Technical Field The invention relates to the technical field of municipal water supply engineering, in particular to environment-friendly sealing glue for a water supply network threading connector and a preparation process thereof, which are particularly suitable for environment-friendly sealing construction of threading connectors of multi-material pipeline connection scenes such as plastic-lined steel pipes, PE pipes and the like in old communities, and can also be applied to threading connector sealing of newly-built water supply network engineering. Background In the engineering of upgrading and reforming the water supply network of old and old communities in towns, the mantle fiber connector is a core component for pipeline connection, and the sealing performance of the mantle fiber connector directly determines the operation stability of a water supply system. The traditional threading joint sealing glue used in the current engineering has a plurality of technical defects exposed in practical application, and can not meet the development requirements of environmental protection and quality long-acting of the modern water supply engineering construction. The traditional sealing glue has the primary problems of insufficient environmental protection, contains a large amount of Volatile Organic Compounds (VOCs), releases pungent odor in the construction process, causes harm to the physical health of constructors, pollutes the construction site and the surrounding environment, is easy to infiltrate into soil after being abandoned to cause soil pollution, has poor multi-material adaptability, is easy to cause leakage problem at interfaces due to uneven adhesion force to different material pipelines such as plastic-lined steel pipes and PE pipes which are common in old communities, influences the sealing performance of a water supply system, has poor sealing durability, has high attenuation speed of sealing performance under the continuous effects of long-term humid environment, environmental temperature change and water pressure of the water supply pipeline, greatly shortens the whole service life of the pipeline, has unreasonable design of the curing speed of the traditional glue, is easy to cause cracks after being cured, has extremely slow curing, seriously influences the construction efficiency and prolongs the construction period. Taking the engineering of upgrading and reforming the water supply of the Rodins market as an example, the engineering relates to 36 communities and 3 thousands of residents, and the comprehensive requirements of environmental protection, multi-material adaptation, high sealing reliability and high construction efficiency are provided for the seal of the threading connector, so that the conventional sealing glue cannot adapt to the construction requirements of the engineering. Therefore, the threading joint sealing glue which is excellent in environmental protection performance, is suitable for pipelines with multiple materials, is stable in sealing and convenient to construct is developed, the problems of large pollution, poor adaptation and easy leakage of the traditional products are solved, and the urgent need in the municipal water supply engineering field is met. Disclosure of Invention Aiming at the defects of the prior art, the invention provides the environment-friendly sealing glue for the water supply pipe threading joint and the preparation process thereof, and the core aim is to realize the following technical aims of green and environment-friendly glue components, reduced VOCs content, no pungent smell, no release of toxic and harmful substances after solidification, meeting the construction environment-friendly requirement of urban sensitive areas, improving the multi-material adaptability of the glue, realizing the tight sealing of threading joints with different materials, reducing the difficulty of construction material selection, enhancing the sealing durability of the glue, prolonging the service life of the water supply pipe network, optimizing the construction performance of the glue, constructing in a humid environment, avoiding complex interface pretreatment, guaranteeing the engineering construction efficiency and reducing the comprehensive construction cost. The invention provides environment-friendly sealing glue for a water supply network threading connector, which comprises, by mass, 40% -50% of an environment-friendly base material, 20% -30% of a modified filler, 5% -10% of a bio-based tackifier, 3% -8% of an environment-friendly curing agent, 2% -5% of a functional auxiliary agent and the balance deionized water, wherein the environment-friendly base material is water-based polyurethane resin, the modified filler is a complex of nano silicon dioxide and talcum powder, the bio-based tackifier is a plant extract modified, and the environ