High-elasticity polyurethane material

• US 10,442,157 B2
• Filed: 03/27/2017
• Issued: 10/15/2019
• Est. Priority Date: 03/27/2017
• Status: Active Grant

• Current Assignee: Chenwen Li, Mingang Li, Shitu Zhao
• Original Assignee: Chenwen Li, Mingang Li, Shitu Zhao
• Inventors: Li, Chenwen, Zhao, Shitu, Li, Mingang
• Primary Examiner(s): Cooney, John M
• Application Number:
  US15/470,183
• Publication Number:
  US 20180271191A1
• Time in Patent Office: 932 Days
• CPC Class Codes: A41D 19/0058 Three-dimensional gloves
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/244 tin salts of carboxylic acids
• CPC Class Codes: C08G 18/3206 aliphatic
• CPC Class Codes: C08G 18/3228 acyclic
• CPC Class Codes: C08G 18/348 Hydroxycarboxylic acids
• CPC Class Codes: C08G 18/48 Polyethers
• CPC Class Codes: C08G 18/4812 Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups
• CPC Class Codes: C08G 18/4825 Polyethers containing two hydroxy groups C08G18/4833 - C08G18/5096 take precedence
• CPC Class Codes: C08G 18/4829 Polyethers containing at least three hydroxy groups C08G18/4833 - C08G18/5096 take precedence
• CPC Class Codes: C08G 18/6692 with compounds of group C08G18/34
• CPC Class Codes: C08G 18/722 Combination of two or more aliphatic and/or cycloaliphatic polyisocyanates
• CPC Class Codes: C08G 18/73 acyclic
• CPC Class Codes: C08G 18/755 and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate

Abstract

A method and composition for preparation of a high-elasticity polyurethane glove material and glove. The method for practicing the invention generally includes the steps of preparing an ultra-high molecular weight polyol, preparing a high-elasticity polyurethane glove material, and preparing a glove by dipping and forming. A high molecular weight polyether polyol is used in conjunction with polyurethane to increase resilience to a degree comparable with rubber material. Conventional polyurethane materials lack flexibility and do not allow for significant elongation or rebound. The material of the present disclosure may be used for medical applications and modifies polyurethane material to achieve properties similar to rubber materials. The polyurethane material resulting from the method according to the present disclosure has excellent biocompatibility and may be widely used in the medical field. The overall performance of the glove of the present disclosure improved over natural latex gloves or nitrile gloves.

Claims

1. A method of producing a polyurethane material comprising:

combining a polyether diol and a polyisocyanate;

causing an addition polymerization reaction to occur, thereby generating a macromolecular polyurethane pre-polymer;

terminating the addition polymerization reaction;

end capping the polymerization reaction product, thereby forming a functional ultra-high molecular weight polyol;

combining the functional ultra-high molecular weight polyol with a hydrophilic group-containing polyether diol;

adding a chain extender; and

generating a high-elasticity polyurethane glove material.

2. The method of claim 1, further comprising adding a catalyst to the polyether diol and the polyisocyanate.

3. The method of claim 2, wherein the catalyst is stannous octoate.

4. The method of claim 1, wherein an average molecular weight of the functional ultra-high molecular weight polyol is between 35,000 and 100,000.

5. The method of claim 1, wherein terminal hydroxyl groups of the functional ultra-high molecular weight polyol have an average hydroxyl functionality of not less than 4.

6. The method of claim 1, wherein terminating the addition polymerization reaction is achieved by adding a blocking agent, wherein said blocking agent is a hard polyether polyol.

7. The method of claim 1, wherein end capping is achieved by addition of a high-functionality polyether polyol.

8. The method of claim 1, wherein the polyether diol and the functional ultra-high molecular weight polyol are mixed in a ratio of between 10 to 0 and 5 to 5, respectively.

9. The method of claim 1, wherein a hydrophilic group-containing diol is added in an amount of between 0.5 and 20%.

10. The method of claim 1, wherein the chain extender is comprised of diamines added in a range of between 1 and 10%.

11. The method of claim 1, wherein a diisocyanate is added in an amount of between 3 and 8%.

12. A method for manufacturing a polyurethane glove emulsion, comprising:

combining a polyether diol and a polyisocyanate;

adding a catalyst to promote an addition polymerization reaction, thereby generating a macromolecular polyurethane pre-polymer;

terminating the addition polymerization reaction;

end capping a polymerization reaction product, thereby forming a functional ultra-high molecular weight polyol;

combining the functional ultra-high molecular weight polyol with a hydrophilic group-containing polyether diol;

adding a chain extender; and

allowing a reaction to occur in order to generate a high-elasticity polyurethane material;

combining the high elasticity polyurethane material with a surfactant; and

adding water to generate an operative high elasticity polyurethane emulsion.

13. The method of claim 12, further comprising combining the high elasticity polyurethane material in a range of between 10 and 40 parts with the surfactant in a range of between 10 and 40 parts;

adding water in a range of between 20 and 80 parts to generate an operative high elasticity polyurethane emulsion.

14. The method of claim 12, wherein the surfactant is selected from a group consisting of a sulfate of an anionic emulsifier, a sulfonate of an anionic emulsifier, and non-ionic emulsifiers, or a mixture thereof.

15. The method of claim 14, wherein a ratio of the anionic emulsifier to the non-ionic emulsifier is in a range of between 9 to 1 and 1 to 9, respectively.

16. The method of claim 12, further comprising the steps of thoroughly mixing the high elasticity polyurethane material and the surfactant at a temperature of between 40°

C. and 80°

C.;

followed by gradually adding deionized water at a rate of 0.04 to 0.2 per minute, such that a process of adding the deionized water takes between 2 to 4 hours to complete, whereupon the reaction is allowed to occur at between 60 and 80°

C. for an insulation mixture for between 2 and 3 hours to generate a milky white emulsion.

17. The method of claim 12, wherein a stress relaxation of a glove is between 60 and 70%, a 300% modulus is less than 3 MPa, a tensile strength is more than 50 MPa and an elongation at break is greater than 700%.

18. A method for manufacturing a polyurethane glove emulsion, comprising:

combining a polyether diol and a polyisocyanate;

adding a catalyst to promote an addition polymerization reaction, thereby generating a macromolecular polyurethane pre-polymer;

terminating the addition polymerization reaction;

end capping the polymerization reaction product, thereby forming a functional ultra-high molecular weight polyol;

combining the functional ultra-high molecular weight polyol with a hydrophilic group-containing polyether diol;

adding a chain extender; and

allowing a reaction to occur in order to generate a high-elasticity polyurethane glove material;

combining the high elasticity polyurethane material with a surfactant; and

adding water to generate an operative high elasticity polyurethane emulsion;

drying a glove mold impregnated with a coagulating agent;

immersing the glove mold in the operative high elasticity polyurethane emulsion;

removing the glove mold from the operative high elasticity polyurethane emulsion to obtain a coated glove mold;

drying the coated glove mold; and

curling and stripping to produce a glove.

19. The method of claim 18, further comprising immersing the glove mold in the operative high elasticity polyurethane emulsion for between 30 and 60 seconds when a temperature of the operative high elasticity polyurethane emulsion is between 30-50°

C. and drying the coated glove mold in an oven for between 10 and 30 minutes at between 80°

C. and 110°

C.