Powder Adhesive with Aromatic Particles for Paper Bonding
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Solution Overview
Problem
Conventional powder adhesives fail to achieve satisfactory adhesive strength across different types of paper media, particularly with glossy paper and paper types having large surface unevenness.
Innovation Solution
A powder adhesive comprising a thermoplastic resin and aromatic compound particles with specific ester group concentration, nitrogen atom concentration, and particle diameter ranges, which enhances adhesive strength by creating regions with varying polarity to interact effectively with both hydrophilic and hydrophobic paper surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional powder adhesives are used, then adhesive strength is satisfactory for plain paper, but adhesive strength deteriorates for glossy paper and paper with large surface unevenness
Solution Approach 1:
The adhesive particles are designed with a core-shell structure where the core contains a thermoplastic resin and the shell contains a polymerizable monomer. This local differentiation allows the core to provide adhesive strength through thermoplastic bonding while the shell enables secondary polymerization bonding, creating different functional zones within the same particle that address diverse paper surface requirements
Solution Approach 2:
The invention uses a composite particle structure combining thermoplastic resin (providing thermal bonding capability) with polymerizable monomer (providing chemical bonding capability). This composite approach allows the adhesive to simultaneously exhibit thermoplastic adhesive properties and polymerization bonding properties, enabling effective bonding across different paper types including glossy and uneven surfaces
2Strength
If powder adhesive with high adhesive strength is used, then bonding strength is improved, but the adhesive fails to provide satisfactory adhesion to both hydrophilic and hydrophobic paper surfaces
Solution Approach 1:
The adhesive particles undergo a parameter change from a dormant state (at room temperature) to an activated state (under heat and light). The thermoplastic resin softens at elevated temperature to enable penetration and initial bonding, while the polymerizable monomer remains inactive until exposed to light, then polymerizes to form strong chemical bonds. This parameter change allows the adhesive to adapt its bonding mechanism to different paper surface properties
Solution Approach 2:
The polymerizable monomer shell acts as an intermediary between the thermoplastic resin core and the paper surface. It provides a flexible interface that can interact with both hydrophilic and hydrophobic surfaces, while the thermoplastic core provides the primary bonding force. This intermediary structure enables the adhesive to bridge different paper types with contrasting surface properties
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 solution provides a high adhesive strength regardless of the paper type, ensuring strong bonding across various paper media, including glossy and uneven surfaces.
Implementation Method 1
a powder adhesive, which is provided by the particulation of an adhesive comprising thermoplastic resin, is coated on a paper medium and adherence is immediately obtained by the application of heat
Implementation Method 2
it has a polymerizable monomer shell; the polymerizable monomer shell forms a polymerization bond with the paper through polymerization
Data Source
AI summary
The powder adhesive comprises a thermoplastic resin and particles of an aromatic compound, wherein the particles of an aromatic compound are particles of a compound that has an aromatic ring and an azo bond bonded to the aromatic ring, or are particles of a compound comprising a heteroaromatic ring comprising nitrogen atom; the thermoplastic resin comprises an ester group; and, designating Es (mmol/g) as an ester group concentration in the thermoplastic resin, M (mass %) as a content of the aromatic compound particles in the powder adhesive, and N (mmol/g) as a nitrogen atom concentration in the aromatic compound particles, Es is from 1.0 mmol/g to 4.5 mmol/g, M is from 1.0×10−4 mass % to 1.0×100 mass %, and N is from 5.0 mmol/g to 15.0 mmol/g.