# US 10,865,268 B1 · Method for preparing wear-resistant-hybrid

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- Number: US 10,865,268 B1
- Document ID: US10865268B1
- Status: Granted
- Kind: B1
- Application number: 16/600,573
- Filed: 2019-10-14
- Published: 2020-12-03
- Granted: 2020-12-15
- Earliest claimed: 2019-05-28
- Assignees: National Chung Shan Institute of Science and Technology
- Applicants: National Chung-Shan Institute of Science and Technology
- Inventors: Chang-Lun Lee; Bei-Huw Shen; Chih-Chia Chen; Wen-Yen Hsieh; Chin-Lung Chiang
- Web page: https://patentgrep.com/patent/US10865268B1

## CPC

- C08G 18/3893: {containing silicon}
- C08G 18/10: Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G 18/289: {containing silicon}
- C08G 18/3895: {Inorganic compounds, e.g. aqueous alkalimetalsilicate solutions; Organic derivatives thereof containing no direct silicon-carbon bonds}
- C08G 18/4825: {Polyethers containing two hydroxy groups (C08G18/4833 - C08G18/5096 take precedence)}
- 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}
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A method for preparing a wear-resistant hybrid, includes (A) providing nano-silica with hydroxyl groups on its surface to react with an isocyanate-based silane to form silica with silyl groups; (B) subjecting the silica with silyl groups to a hydrolytic condensation reaction by using a sol-gel technology to form highly bifurcated Si-HB nanoparticles with hydroxyl groups; (C) providing a diisocyanate to react with a polyol to form a urethane pre-polymer; and (D) subjecting the Si-HB nanoparticles with hydroxyl groups to an addition reaction with the urethane pre-polymer and with a chain-extending reagent to form a hybrid of Si-polyurethane (PU/Si-HB), whereby a wear-resistant hybrid of Si-polyurethane is prepared.

## Claims

### Claim 1

A method for preparing a wear-resistant hybrid, comprising:
(A) providing nano-silica with hydroxyl groups on its surface to react with an isocyanate-based silane to form silica with silyl groups;
(B) subjecting the silica with silyl groups to a hydrolytic condensation reaction by using sol-gel technology to form highly bifurcated Si-HB nanoparticles with hydroxyl groups;
(C) providing a diisocyanate to react with a polyol to form a urethane pre-polymer;
(D) subjecting the Si-HB nanoparticles with hydroxyl groups to an addition reaction with the urethane pre-polymer and with a chain-extending reagent to form a hybrid of Si-polyurethane (PU/Si-HB).

### Claim 2 (depends on 1)

The method for preparing a wear-resistant hybrid according to claim 1, wherein the isocyanate-based silane in the step (A) is 3-isocyanatopropyltriethoxysilane (IPTS).

### Claim 3 (depends on 1)

The method for preparing a wear-resistant hybrid according to claim 1, wherein the silica with silyl groups in the step (A) or in the step (B) is triethoxysilylated silica.

### Claim 4 (depends on 1)

The method for preparing a wear-resistant hybrid according to claim 1, wherein the diisocyanate in the step (C) is selected from a group consisting of aliphatic isocyanates and aromatic isocyanates.

### Claim 5 (depends on 1)

The method for preparing a wear-resistant hybrid according to claim 1, wherein the diisocyanate in the step (C) is isophoronediisocyanate (IPDI).

### Claim 6 (depends on 1)

The method for preparing a wear-resistant hybrid according to claim 1, wherein the polyol in the step (C) is selected from a group consisting of polyether polyols and polyester polyols.

### Claim 7 (depends on 1)

The method for preparing a wear-resistant hybrid according to claim 1, wherein a molar equivalent ratio of the diisocyanate to the polyol in the step (C) is 2:1.

### Claim 8 (depends on 1)

The method for preparing a wear-resistant hybrid according to claim 1, wherein the chain-extending reagent in the step (D) is 1,4-butanediol.

### Claim 9 (depends on 1)

The method for preparing a wear-resistant hybrid according to claim 1, wherein a weight of the Si-HB nanoparticles in the step (D) is 1% to 3% of a total weight of the hybrid of Si-polyurethane (PU/Si-HB).

### Claim 10 (depends on 1)

The method for preparing a wear-resistant hybrid according to claim 1, wherein a reaction temperature of the step (C) or of the step (D) is between 70° C. and 90° C.