10-50 G/D HIGH STRENGTH POLYETHYLENE FIBER AND PREPARATION METHOD THEREOF

• US 20100204427A1
• Filed: 07/14/2008
• Published: 08/12/2010
• Est. Priority Date: 02/26/2008
• Status: Active Grant

• Current Assignee: Shandong ICD High Performance Fibres Co. Ltd. (DSM-Firmenich AG)
• Original Assignee: Shandong ICD High Performance Fibres Co. Ltd. (DSM-Firmenich AG)
• Inventors: Ren, Yi
• Granted Patent: US 8,188,206 B2
• Time in Patent Office: Days
• US Class Current: 526/352
• CPC Class Codes: D01F 6/46 of polyolefins

Abstract

A 10-50 g/d high strength polyethylene fiber and preparation method thereof are provided, which are in the high molecular material field. Said fiber is obtained by cross blend melt spinning method, and its strength is 10-50 g/d, its modulus is 400-2000 g/d. The material used by said cross blend melt spinning method is obtained by mixing low density polyethylene with molecular weight of 2/5-500,000 and super molecule weight polyethylene with molecular weight of 120-7000,000 in the proportion of 2-10:1. Flow modifier or diluent is not additionally added in the present invention, raw material consumption is low, extra high pressure is avoided, energy consumption and cost of production are low, technological process is simple, single line capacity is easily raised, and large scale industrial production can be realized.

Claims

1. A high strength polyethylene (HS-PE) fiber, wherein said fiber is obtained by a blend melt spinning method, a tensile strength of said fiber ranges from 10 to 50 cN/dtex and a tensile elastic modulus of said fiber ranges from 400 to 2000 cN/dtex.

2. The high strength polyethylene fiber according to claim 1, wherein the tensile strength ranges from 10 to 20 cN/dtex.

3. The high strength polyethylene fiber according to claim 1, wherein the tensile strength ranges from 20 to 30 cN/dtex.

4. The high strength polyethylene fiber according to claim 1, wherein the tensile strength ranges from 30 to 40 cN/dtex.

5. The high strength polyethylene fiber according to claim 1, wherein the tensile strength ranges from 40 to 50 cN/dtex.

6. A method for preparing an HS-PE fiber with a tensile strength ranging from 10 to 50 cN/dtex, comprising:

using low density polyethylene (PE) and ultrahigh molecular weight polyethylene (UHMWPE) as raw materials at a weight ratio in a blend-melt-spinning method, wherein said weight ratio of the low density PE and UHMWPE is from 2;

1 to 10;

1, a weight molecular of the low density PE is between 25,000 and 200,000, and a weight molecular of the UHMWPE is from 1,200,000 to 7,000,000.

7. The method according to claim 6, further comprising:

mixing the low density PE and UHMWPE to obtain a mixture solution;

melting the mixture solution in a twin-screw extruder with a temperature between 150 and 300°

C. to obtain a polyethylene melt;

extruding the polyethylene melt from a spinning plate of a spinning box at a spray speed of about 3 to 5 m/min;

obtaining a new-born fiber through cooling molding of extruded filatures by a blast apparatus, wherein a cooling temperature is maintained between 0 and 35°

C. and a wind speed is about 5 to 8 m/s;

drawing the new-born fiber in a godet roller, wherein a draft multiple is 2 to 6 times;

transferring the new born fiber into two oil baths filled with glycol by the godet roller and stretching the new born fiber evenly, wherein a temperature of an oil bath is maintained between 50 and 150°

C., and a total draft multiple is 3 to 20 times;

washing the drafted fiber in a water bath containing heterogeneous alcohol surfactants with a temperature between 60 and 100°

C.; and

drying the washed fiber to remove water and winding the dried fiber onto a tube.

8. (canceled)

9. (canceled)

10. A method for preparing an HS-PE fiber with a tensile strength ranging from 10 to 50 cN/dtex, comprising:

using low density PE and UHMWPE as raw materials at a weight ratio from 2;

1 to 10;

1 in a blend-melt-spinning method.

11. The method of claim 10, further comprising:

mixing the low density PE and UHMWPE to obtain a mixture solution; and

melting the mixture solution to obtain a polyethylene melt.

12. The method of claim 11, wherein the mixture solution is melt in a twin-screw extruder with a temperature between 150 and 300°

C.

13. The method of claim 11, further comprising:

extruding the polyethylene melt.

14. The method of claim 13, wherein the polyethylene melt is extruded from a spinning plate of a spinning box at a spray speed of about 3 to 5 m/min.

15. The method of claim 13, further comprising:

obtaining a new-born fiber through cooling molding of extruded filatures.

16. The method of claim 15, wherein the cooling molding is done by a blast apparatus, wherein a cooling temperature is maintained between 0 and 35°

C.

17. The method of claim 15, further comprising:

drawing the new-born fiber.

18. The method of claim 17, wherein the new-born fiber is drawn in a godet roller, wherein a draft multiple is 2 to 6 times.

19. The method of claim 17, further comprising:

transferring the new born fiber into an oil bath.

20. The method of claim 19, wherein the oil bath is filled with glycol and wherein a temperature of the oil bath is maintained between 50 and 150°

C.