Method for manufacturing gloves
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Solution Overview
Problem
Existing gloves made with aqueous urethane resin lack sufficient flexibility and grip properties due to insufficient formation of a coagulated coating film without processes like heating or foaming.
Innovation Solution
A method involving the use of an aqueous urethane resin composition thickened with a specific thickening agent, such as carboxymethyl cellulose, and coagulated with a metal salt to form a porous structure on fiber-knitted gloves without heating or foaming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a coating film based on aqueous urethane resin is formed on gloves, then environmental friendliness is improved, but grip property deteriorates
Solution Approach 1:
The patent applies porous materials by forming a coagulated coating film with a porous structure on the glove surface. The porous structure is achieved through coagulation of aqueous urethane resin using metal salt, creating numerous small holes that provide mechanical interlocking with objects, thereby improving grip property while maintaining environmental friendliness of the aqueous resin system
Solution Approach 2:
The patent applies parameter changes by modifying the physical and chemical parameters of the coating film formation process. Specifically, it changes from conventional solvent-based resins to aqueous urethane resin, and controls coagulation parameters (metal salt concentration, temperature, pH) to achieve optimal porous structure that balances environmental friendliness with enhanced grip property
2Device complexity
If a coagulated coating film is formed without heating or foaming processes, then manufacturing complexity is reduced, but coating film quality deteriorates
Solution Approach 1:
The patent applies mechanics substitution by replacing complex thermal and chemical processes (heating and foaming) with a simpler coagulation process using metal salt. The coagulation mechanism allows formation of a high-quality porous coating film through controlled precipitation of urethane resin, eliminating the need for heating equipment and foaming agents while maintaining or improving coating film quality
Solution Approach 2:
The patent applies intermediary by using metal salt as a mediating substance to induce coagulation of aqueous urethane resin. The metal salt acts as a coagulating agent that facilitates formation of the porous coating film structure without requiring heating or foaming processes, thereby simplifying manufacturing while ensuring coating film quality through controlled coagulation
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 method enables the formation of a coagulated coating film with a porous structure, resulting in gloves with enhanced flexibility and grip properties.
Implementation Method 1
adding a thickening agent (B) having an oxyethylene group content of 2×10 -2 to 5×10 -2 mol/g to the aqueous urethane resin composition (A)
Implementation Method 2
coagulated with a metal salt to form a porous structure on fiber-knitted gloves
Data Source
Figure 1~2
AI summary
The present invention provides a method for manufacturing gloves, including adding a thickening agent (B) having an oxyethylene group content of 2×10-2 mol/g or less to an aqueous urethane resin composition containing an aqueous urethane resin (A) having an acid value of 0.01 mgKOH/g or higher in a range of 0.01 to 30 parts by mass relative to 100 parts by mass of the aqueous urethane resin (A) to obtain a thickened liquid; and (i) immersing fiber-knitted gloves in the thickened liquid and subsequently performing coagulation in a coagulation bath (C) containing a metal salt (c-1) or (ii) immersing fiber-knitted gloves previously immersed in a coagulation bath (C) containing a metal salt (c-1) in the thickened liquid to perform coagulation. As the thickening agent (B), it is preferable to use one or more kinds of thickening agent that is selected from the group consisting of a cellulose thickening agent, an acryl thickening agent, and a urethane thickening agent. Furthermore, as the metal salt (c-1), it is preferable to use calcium nitrate.