Hot Melt Weld Bead Composition for Flooring Adhesion
Solution Overview
Problem
Conventional hot melt weld beads for floor coverings face challenges in balancing ease of installation with maintenance requirements, particularly in adhering to varnished surfaces while resisting mechanical attack and dirt, and maintaining appearance over time.
Innovation Solution
A hot melt weld bead composition incorporating polymers based on acrylic acid, methacrylic acid, or maleic anhydride, partially or entirely neutralized to form an ionomer, combined with waxes like carnauba or paraffin, and optionally copolyamides, to achieve strong adhesion, resistance to scratches and dirt, and ease of cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high proportions of tackifiers are used to increase adhesion to varnished surfaces, then adhesion is improved, but mechanical strength and resistance to dirt deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters by using acrylic acid copolymers with controlled acid levels (10-20%) instead of traditional high-proportion tackifiers. This parameter change achieves strong adhesion to varnished surfaces while maintaining mechanical strength and dirt resistance, resolving the contradiction between adhesion and reliability.
Solution Approach 2:
The invention uses a composite material system consisting of acrylic acid copolymer, polyethylene, and optional ionomer or copolyamide components. This composite approach provides both the adhesion properties needed for varnished surfaces and the mechanical strength required for durability, eliminating the need to rely on high proportions of tackifiers.
2Strength
If the weld bead is made very sticky to bond varnished surfaces, then adhesion is improved, but ease of operation deteriorates due to difficulty in shaving and increased sensitivity to clogging
Solution Approach 1:
The invention modifies the viscosity and stickiness parameters by using acrylic acid copolymers with controlled molecular weight and acid content. This creates a weld bead that is sticky enough for adhesion but not so sticky as to be difficult to shave or prone to clogging, thereby improving ease of operation while maintaining strong bonding.
Solution Approach 2:
The invention creates local quality differences within the weld bead composition, with the acrylic acid copolymer providing targeted adhesion to varnished surfaces while the polyethylene and optional ionomer/copolyamide components maintain overall processability and resistance to clogging. This localized functional distribution resolves the contradiction between adhesion and ease of operation.
3Strength
If the weld bead composition is made highly polar to increase stickiness, then adhesion is improved, but resistance to dirt and mechanical attack deteriorates
Solution Approach 1:
The invention precisely controls the polarity parameter by using acrylic acid copolymers with acid levels between 10-20%, rather than highly polar compositions. This moderate polarity provides sufficient adhesion to varnished surfaces while maintaining resistance to dirt and mechanical attack, resolving the contradiction between adhesion strength and resistance to harmful factors.
Solution Approach 2:
The composite material system combines acrylic acid copolymer (providing controlled polarity and adhesion) with polyethylene and optional ionomer or copolyamide (providing mechanical strength and dirt resistance). This composite approach balances polarity to achieve both good adhesion and resistance to harmful factors simultaneously.
4Strength
If the weld bead is made highly sticky for strong adhesion, then adhesion is improved, but ease of manufacture deteriorates due to adherence to extrusion device
Solution Approach 1:
The invention adjusts the viscosity and stickiness parameters by selecting acrylic acid copolymers with appropriate molecular weight and acid content. This creates a composition that is sticky enough for strong adhesion but has sufficient flow characteristics to extrude easily without adhering to the extrusion device, thereby improving ease of manufacture while maintaining adhesion strength.
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 proposed composition demonstrates improved adhesion, resistance to tar, dirt, and scratches, with enhanced cleaning capabilities, maintaining appearance and performance over time without relying on tackifiers that degrade mechanical strength.
Implementation Method 1
incorporating polymers based on acrylic acid, methacrylic acid, or maleic anhydride, partially or entirely neutralized to form an ionomer
Implementation Method 2
the hot melt weld bead, which is generally a cylindrical bead, is introduced into the welding nozzle of a hot air torch which heats the weld bead and allows it to penetrate into the gap formed by coating elements
Implementation Method 3
Once cooled, the excess cord is then shaved off using a quarter-moon knife
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The invention relates to a heat-fusible weld seam for joining ground coating members, comprising a copolymer selected from the group of polymers containing acrylic acid, methacrylic acid or maleic anhydride, a polyethylene and a copolyamide.