One-Pack Aqueous Adhesive Latex Composition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing one-pack aqueous adhesives face challenges in achieving a balance between initial adhesive strength, storage stability, and spray coating properties, particularly when used with soft materials like furniture and foams, and often result in unstable mixing ratios and clogging issues during spraying.
Innovation Solution
A latex composition is developed by combining a chloroprene polymer latex with an acrylic polymer latex and a pH adjustor, specifically boric acid or amino acids, to create a one-pack aqueous adhesive that maintains high initial adhesive strength and soft adhesive layer properties while ensuring storage stability and spray coating efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a two-pack adhesive is used to improve initial adhesive strength, then adhesive strength is improved, but device complexity increases and ease of operation deteriorates due to unstable mixing ratios and clogging issues
Solution Approach 1:
The patent combines the main adhesive components (chloroprene polymer latex, acrylic polymer latex, and surfactant) into a single one-pack formulation, eliminating the need for separate curing agent mixing. This merging of components resolves the technical contradiction by maintaining high initial adhesive strength while dramatically improving ease of operation, as users no longer need to precisely mix two separate packages and deal with mixing ratio instability or clogging issues.
Solution Approach 2:
The patent optimizes the composition parameters within the one-pack system, specifically using chloroprene polymer latex with 20-40% solid content, acrylic polymer latex with specific glass transition temperature (-40 to -10°C), and controlled amounts of surfactant (0.1-5 parts by mass). These parameter changes enable the single-package system to achieve adhesive strength comparable to two-pack systems while eliminating mixing complexities.
2Strength
If solvent-based adhesive is used to achieve high adhesive strength, then adhesive strength is improved, but harmful factors increase due to fire risk and VOC emissions
Solution Approach 1:
The patent fundamentally changes the solvent parameter from organic solvents to water as the continuous phase, creating an aqueous adhesive system. This parameter change eliminates fire risks and VOC emissions associated with solvent-based adhesives while maintaining high adhesive strength through the optimized chloroprene-acrylic polymer latex composition and controlled crystallization process.
Solution Approach 2:
The patent converts the traditionally harmful aspect of chloroprene polymer (requiring organic solvents for adequate performance) into a benefit by developing a water-based formulation that leverages the crystallization behavior of chloroprene polymer latex. The controlled crystallization provides strong bonding while the aqueous base eliminates fire and health hazards.
3Object-generated harmful factors
If aqueous adhesive containing chloroprene polymer latex is used to eliminate solvents, then harmful factors are reduced, but adhesive strength deteriorates
Solution Approach 1:
The patent creates a composite adhesive system combining chloroprene polymer latex and acrylic polymer latex in specific proportions (chloroprene: 20-40% solid content, acrylic with Tg of -40 to -10°C). This composite material approach allows the aqueous adhesive to achieve high initial adhesive strength through synergistic effects: chloroprene provides rapid crystallization-based bonding while acrylic contributes flexibility and adhesion, overcoming the traditional weakness of aqueous chloroprene adhesives.
Solution Approach 2:
The patent optimizes critical parameters including the glass transition temperature of acrylic polymer (-40 to -10°C), surfactant concentration (0.1-5 parts by mass), and polymer latex ratios to maximize initial adhesive strength. These parameter changes enable the aqueous system to achieve bonding strength comparable to solvent-based systems while maintaining the environmental benefits of water-based formulation.
4Ease of operation
If one-pack aqueous adhesive is used to simplify operation, then ease of operation is improved, but adhesive strength and storage stability deteriorate
Solution Approach 1:
The patent carefully controls the pH of the aqueous adhesive system and selects specific polymer compositions (chloroprene with controlled molecular weight and acrylic with specific Tg) to prevent premature crystallization during storage while ensuring rapid bonding during application. This parameter control allows the one-pack system to maintain both high adhesive strength and storage stability without requiring complex mixing procedures.
Solution Approach 2:
The patent uses surfactants as intermediary substances to stabilize the aqueous dispersion of polymer latexes, preventing aggregation and maintaining uniform distribution of components during storage. The surfactant (0.1-5 parts by mass) acts as a mediator that keeps the system stable in the one-pack formulation while allowing the chloroprene-acrylic composite to deliver high adhesive strength when applied.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The latex composition achieves a high crystallization speed and improved adhesive properties without compromising storage stability or spray coating performance, making it suitable for bonding soft materials like furniture and foams with lumber or leather.
Implementation Method 1
maintains high initial adhesive strength and soft adhesive layer properties while ensuring storage stability and spray coating efficiency
Data Source
AI summary
Provided are a latex composition suitable for use in a one-pack aqueous adhesive that has an excellent balance of excellent initial adhesive strength, storage stability, and spray coating properties and gives a soft adhesive layer after drying and a one-pack aqueous adhesive including the latex composition. A latex composition includes 100 parts by mass of a latex mixture including 50 to 85% by mass of a chloroprene polymer latex in terms of solid content, containing a chloroprene polymer and including 15 to 50% by mass of an acrylic polymer latex in terms of solid content, containing an acrylic polymer having a glass transition temperature of -40 to -10°C and includes 3 to 6 parts by mass of a 5% aqueous boric acid solution or a pH adjustor selected from amino acids having an isoelectric point of 5.5 to 6.5, in terms of solid content. The chloroprene polymer is preferably a chloroprene homopolymer, a copolymer of chloroprene and 2,3-dichloro-1,3-butadiene, or a mixture of them.