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Abstract: This sealant is made of pure acrylic acid lotion with high flexibility, high stability and excellent weather resistance as the core film forming base material, together with functional additives and inorganic filling system. It is different from traditional styrene acrylic lotion sealant, and has outstanding advantages such as high film flexibility, strong base adhesion, secondary coating, air permeability without bulge, and wide construction adaptability. The article comprehensively analyzes the tensile elasticity, interface bonding strength, aging stability, temperature adaptability, and coating performance of CB type acrylic sealant through systematic performance testing and engineering comparison experiments. It focuses on the sealing adaptation mechanism of CB type acrylic sealant on porous building substrate surfaces, summarizes the application advantages of this type of sealant in wall crack repair, door and window perimeter sealing, interior wall joint treatment, lightweight board joint filling and other scenarios. At the same time, it objectively points out the inherent displacement ability of water-based acrylic system is limited, long-term immersion stability is weak, and low-temperature elasticity is inferior to modified silicone and polyurethane sealant. The application boundary and engineering selection principles of CB type acrylic sealant are clarified, providing green sealing construction for non structural low displacement joints of building interior and exterior walls. Authoritative theoretical basis and engineering reference.

1. Research background

In modern building envelope construction and existing building repair projects, wall joints, door and window closures, panel splicing gaps, and subtle cracks in walls are key weak points for building waterproofing, sound insulation, and thermal sealing. Traditional sealing materials generally have compatibility limitations: silicone sealant has excellent weather resistance but cannot be coated with topcoat, and later wall renovation coating is prone to paint film peeling, color difference and delamination problems; Polyurethane sealant has high elasticity and strong displacement ability, but it has high cost, complex construction process, relatively high VOC content, and is not suitable for thin layer sealing of porous substrates; Ordinary styrene acrylic sealant has high hardness, insufficient flexibility, and poor resistance to yellowing. It is prone to powdering, cracking, and debonding failure during long-term indoor and outdoor service.

In view of the industry pain points of conventional building sealing materials, such as “poor coating performance, weak adaptation of porous base materials, unbalanced cost performance, and large construction limitations”, CB water-based pure acrylic building sealant has become the preferred material for non structural building joint sealing by virtue of the excellent film forming flexibility, substrate wettability, and environmental protection characteristics of pure acrylic lotion. This core journal article is based on practical engineering applications, systematically analyzing the material characteristics, performance advantages, and applicable scenarios of CB type acrylic sealant, clarifying its performance differences from traditional sealing materials, and identifying its engineering application scope and technical shortcomings, providing important support for the selection of fine sealing materials and standardized construction of buildings.

Formula system and film-forming characteristics of CB type acrylic sealant

The study clearly pointed out that CB type building sealant uses high-purity pure acrylic acid lotion as the only film forming connection main body, abandons the styrene hard monomer component, and greatly improves the flexibility, yellowing resistance and air permeability of the adhesive film compared with traditional styrene acrylic sealant. Pure acrylic lotion has regular molecular chain structure, uniform distribution of polar groups, soft and compact film after film formation, low internal stress, which can effectively adapt to the micro expansion and deformation of building substrate; At the same time, the hydrophilic and hydrophobic structure of the lotion system is balanced reasonably, and the film-forming has excellent unidirectional permeability. The moisture of the base layer can diffuse outward, and the external rainwater cannot penetrate inward, effectively solving the common problems of bulge, delamination and falling off of porous substrate seals.

In terms of formula system design, CB type sealant is compounded with ultrafine inorganic fillers, wetting and dispersing agents, rheological control agents, and anti mold stabilizers. The solid content of the system is moderate, and the construction rheological properties are excellent. Scratching and extrusion construction are smooth and smooth, and the molding is full and uniform. Compared to modified silicone and polyurethane sealants, this system uses water as the dispersing medium, with no organic solvent volatilization, green, low VOC, non-toxic, odorless, and safe construction. It meets modern building green construction standards and is suitable for harsh environmental protection scenarios such as indoor enclosed spaces, home decoration and repair, and detailed sealing of public buildings.

Core performance advantages of CB type acrylic sealant

3.1 Excellent adaptability and interfacial adhesion performance of porous substrates

The research and experimental results show that CB type acrylic sealant has strong wetting, penetration, and bonding abilities for porous building substrates such as cement mortar, concrete, gypsum board, calcium silicate board, and aerated brick. Pure acrylic lotion has rich polarity and moderate surface tension. During construction, it can quickly penetrate into the micro pores of the base material, and form a mechanical occlusive bonding structure after curing. The interface bonding is tight and firm, effectively avoiding the common defects of virtual adhesion, hollowing and water seepage of porous base material seals. At the same time, it also has good adhesive adaptability to metal, glass, and plastic door and window substrates, which can achieve integrated sealing of multi material joints around doors and windows and wall panels. The comprehensive substrate adaptability is significantly better than that of single functional sealant.

3.2 Unique Coating Performance, Suitable for Later Renovation Coating

The article highlights the core differentiation advantage of CB type acrylic sealant: complete topcoat coverage. Traditional silicone sealant has extremely low surface energy and strong hydrophobicity, making it difficult for latex paint and exterior wall coatings to adhere. The sealing area is prone to problems such as glue exposure, color difference, and paint film peeling, which seriously affect the appearance and overall coating effect of building facades. CB type pure acrylic sealant has extremely high compatibility with water-based latex paint, exterior wall real stone paint, texture coating and other coating material systems. After the sealant is cured, it can be directly applied as a topcoat. The paint film has excellent adhesion, no shrinkage, no peeling, and no color difference, and can be perfectly integrated into the overall building finish. It is suitable for integrated coating construction after building decoration, exterior wall renovation, and crack repair, and is the exclusive preferred material for coating and sealing scenes.

3.3 Good weather stability and breathable waterproof characteristics

Through artificial accelerated aging and natural exposure tests, CB type acrylic sealant has been verified to have no obvious yellowing, powdering, or cracking, and excellent dimensional stability. The pure acrylic lotion has no benzene ring structure, and its UV aging resistance is far better than that of the styrene acrylic system. Long term outdoor service can maintain good elasticity and integrity; At the same time, the adhesive film has the functional feature of “breathable and impermeable”. Water vapor inside the base layer can be released outward through the micro pores of the adhesive film, avoiding the accumulation of water vapor and causing the adhesive layer to bulge and peel off. External liquid water cannot penetrate into the joint, balancing the dual functions of moisture-proof and breathable wall and joint waterproof sealing. It is particularly suitable for the sealing construction of thin plastering systems and breathable enclosure structures on exterior walls.

3.4 Outstanding Construction Performance and Engineering Economy

CB type acrylic sealant can be applied at room temperature without special curing conditions. It has a moderate surface drying speed, no sagging, and good formability. It is suitable for various construction methods such as manual scraping and glue gun extrusion, with high construction tolerance and simple post maintenance. Compared with polyurethane and silicone modified sealants, the raw material cost is low and the cost-effectiveness is excellent. It is suitable for large-scale, multi node building conventional joint sealing projects and has high industrial promotion value.

4. Inherent Defects of Materials and Engineering Applicable Boundaries

This study objectively elucidates the performance shortcomings and application limitations of CB type acrylic building sealant, and clarifies its engineering applicability boundary. Firstly, this sealant belongs to the water-based film-forming sealing material, which relies on the physical evaporation of water to form a film. It has no chemical cross-linking network structure and has limited displacement adaptability. It is only suitable for conventional building joints with low displacement and slight deformation, and cannot adapt to harsh outdoor conditions such as large deformation structural expansion joints, seismic joints, and high temperature and high humidity alternation; Secondly, compared to cross-linked sealant, its long-term water immersion resistance is weaker, and long-term immersion is prone to slight softening and decreased cohesive strength, making it unsuitable for sealing areas with accumulated water in basements, pools, kitchens, and bathrooms that have been immersed for a long time; Finally, the elasticity of the adhesive film slightly decreases in extreme low-temperature environments, and its ultra-low temperature crack resistance is weaker than that of silicone fluorine modified and polyurethane sealing systems.

The article clearly states that the core positioning of CB type acrylic sealant is a conventional non structural, low displacement, and paintable building sealing material, which cannot replace high elasticity structural sealant. In engineering applications, it is necessary to strictly distinguish working conditions and select materials reasonably.

Summary of 5 Engineering Application Scenarios

Based on extensive engineering practice verification, this literature summarizes the optimal adaptation scenarios for CB type acrylic sealant, including low displacement, secondary coating required, and porous substrate sealing scenarios such as splicing gaps in building interior wall panels, repairing minor cracks in walls, sealing edges around door and window openings, dividing joints in exterior wall plastering layers, lightweight partition wall joints, ceiling sealing, pre sealing treatment for painting and renovation of old buildings. This material, with its comprehensive advantages of being coated, highly breathable, weather resistant, stable, environmentally friendly, and cost-effective, perfectly solves the engineering problem of conventional sealing materials being unable to balance sealing and coating. It is the core material for refined sealing construction in civil buildings.

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