Formula for toe cap of safety shoe
By using modified polyurethane resin and specific additives in the formula of safety shoe toe, the existing plastic toe has solved the problems of low toughness and pollution of the environment, and achieved green and environmentally friendly, low VOC and high toughness safety shoe toe, improving the performance of the toe.
Patent Information
- Application Number
- CN202411924093.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-02-25
AI Technical Summary
Existing plastic toe are low in toughness and have problems of polluting the environment.
Modified polyurethane resin composed of isocyanate components and polyol components is used as the raw material for safety shoe toe. The specific formula is 10-50% isocyanate components and 50-90% polyol components, and carbodiimine carbodisulfone imine modified MDI, quartz sand and trimethylol propane are added to the formula.
It has achieved a green and environmentally friendly, low VOC and high toughness safety shoe toe, which has improved the mechanical properties, flame retardant properties and mechanical strength of the toe, and is in line with the national requirements for production safety and environmentally friendly.
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of safety shoes, and in particular to a formula for a toe cap of a safety shoe. Background Art
[0002] Safety shoes are special shoes designed to protect the wearer's feet from injury in the working environment. The toe of the safety shoe is the part of the safety shoe that covers the toes and has the characteristics of impact resistance and crushing resistance. The toe material is divided into plastic toe, steel toe, and alloy toe according to the working environment and protection needs. Among them, plastic toe is mostly made of materials such as polyamide and polyurethane. However, the existing plastic toe has the problems of low toughness and environmental pollution. For this reason, it is necessary to develop a modified polyurethane resin for safety shoes. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a safety shoe toe formula that is green, environmentally friendly and has high toughness in view of the deficiencies of the above-mentioned prior art.
[0004] To achieve the above object, the present invention provides the following technical solution: a safety shoe toe formula, composed of an isocyanate component and a polyol component, wherein the mass percentage of the isocyanate component and the polyol component is: 10%-50% of the isocyanate component, 50%-90% of the polyol component, and the total is 100%; In terms of mass percentage, the formula of the isocyanate component is: Diphenylmethane-4,4' diisocyanate 40%-55%; 2,4'-diphenylmethane diisocyanate 20%-30%; Carbodiimide-uretonimine modified MDI 15%-40%; In terms of mass percentage, the formula of the polyol component is: Polyether polyol 40%-60%; Polyester polyol 20%-30%; Chain extender 1%-10%; Trimethylolpropane 1%-10%; Quartz sand 1%-5%; Catalyst 0.01%-0.5% A further configuration of the present invention is that the chain extender is dipropylene glycol.
[0005] A further configuration of the present invention is that the catalyst is dibutyltin dilaurate.
[0006] The present invention with the above characteristics: the modified polyurethane resin prepared by the above formula is used as the raw material of the toe of the safety shoe, which has the advantages of being green, environmentally friendly, low in VOC, and high in toughness, and meets the current national requirements for production safety and environmental friendliness; by adding carbodiimide-uretonimine modified MDI to the formula of the toe of the safety shoe, the toe of the safety shoe can be given good mechanical properties, such as tensile strength, tear strength, etc., and the flame retardant property of the toe of the safety shoe is improved, thereby improving its safety; by adding quartz sand to the formula of the toe of the safety shoe, the mechanical strength of the toe can be improved, including Tensile strength, compressive strength, impact resistance, etc. Quartz sand forms a "skeleton" effect in the modified polyurethane resin, which increases the tensile properties of the polyurethane resin, reduces the risk of cracks and ruptures in the material during use, and improves the tensile strength, compressive strength and impact resistance of the toe cap; by adding trimethylolpropane to the formula of the toe cap of safety shoes, the cross-linking effect of trimethylolpropane can improve the stability of the modified polyurethane resin, and can resist the erosion of external factors such as ultraviolet rays, oxidation and aging, which helps to prevent the appearance and performance of the manufactured toe cap from changing significantly over a long period of time.
[0007] The present invention is further described in detail below in conjunction with embodiments. DETAILED DESCRIPTION
[0008] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.
[0009] The present invention provides an embodiment: a safety shoe toe formula, which is composed of an isocyanate component and a polyol component, wherein the mass percentage of the isocyanate component and the polyol component is: 30% of the isocyanate component and 70% of the polyol component; In terms of mass percentage, the formula of the isocyanate component is: Diphenylmethane-4,4' diisocyanate 45%; 2,4'-diphenylmethane diisocyanate 25%; Carbodiimide-uretonimine modified MDI 30%; In terms of mass percentage, the formula of the polyol component is: Polyether polyol 55.5%; Polyester polyol 25%; Dipropylene glycol 8%; Trimethylolpropane 8%; Quartz sand 3%; Dibutyltin dilaurate 0.5%.
Claims
1. A safety shoe toe formula, characterized by: It is composed of an isocyanate component and a polyol component, wherein the mass percentage of the isocyanate component and the polyol component is as follows: 10%-50% of the isocyanate component, 50%-90% of the polyol component, and the total is 100%; In terms of mass percentage, the formula of the isocyanate component is: Diphenylmethane-4,4' diisocyanate 40%-55%; 2,4'-diphenylmethane diisocyanate 20%-30%; Carbodiimide-uretonimine modified MDI 15%-40%; In terms of mass percentage, the formula of the polyol component is: Polyether polyol 40%-60%; Polyester polyol 20%-30%; Chain extender 1%-10%; Trimethylolpropane 1%-10%; Quartz sand 1%-5%; Catalyst 0.01%-0.5%.
2. The safety shoe toe formula according to claim 1, characterized in that: The chain extender is dipropylene glycol.
3. The safety shoe toe formula according to claim 1, characterized in that: The catalyst is dibutyltin dilaurate.