Halogen free flame-retardant materials and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-11840656-B2
Application number	US-202117519587-A
Country	US
Kind code	B2
Filing date	Nov 5, 2021
Priority date	Nov 5, 2021
Publication date	Dec 12, 2023
Grant date	Dec 12, 2023

Abstract

The disclosure provides a forming method of a halogen-free flame-retardant material. The method includes the followings. A twin-screw extruder including a first zone and a second zone is used. A mixture in the first zone is mixed, melted and heated to form a molten mixture. The mixture includes a halogen-free flame retardant, a wear-resistant modifier, a thermoplastic elastomer, and an antioxidant. In addition, a silane-modified nano-silica aqueous suspension is introduced into the second zone to mix the silane-modified nano-silica aqueous suspension with the molten mixture from the first zone. The first zone and the second zone are continuously connected regions.

First claim

What is claimed is:

1. A forming method of a halogen-free flame-retardant material, comprising:
providing, a twin-screw extruder comprising a first zone and a second zone;
mixing, melting and heating a mixture in the first zone to form a molten mixture, wherein the mixture comprises a halogen-free flame retardant, a wear-resistant modifier, a thermoplastic elastomer, and an antioxidant; and
introducing a silane-modified nano-silica aqueous suspension into the second zone to mix the silane-modified nano-silica aqueous suspension with the molten mixture from the first zone,
wherein the first zone and the second zone are continuously connected regions, and
a pump pressure for introducing the silane-modified nano-silica aqueous suspension into the second zone is 20 to 50 bars.

2. The forming method of a halogen-free flame-retardant material as described in claim 1 , wherein the silane-modified nano-silica aqueous suspension comprises silane, nano-silica powder, and water, and based on 100 parts by weight of the total weight of the mixture, a content of the nano-silica powder is 0.5 to 12 parts by weight.

3. The forming method of a halogen-free flame-retardant material as described in claim 1 , wherein the mixture further comprises a volume resistivity enhancer modified elastomer.

4. The forming method of a halogen-free flame-retardant material as described in claim 3 , wherein the volume resistivity enhancer modified elastomer comprises a styrene-ethylene/butylene-styrene copolymer thermoplastic elastomer or a polyolefin elastomer.

5. The forming method of a halogen-free flame-retardant material as described in claim 3 , wherein based on 100 parts by weight of the total weight of the mixture, a content of the volume resistivity enhancer modified elastomer is 5 to 30 parts by weight.

6. The forming method of a halogen-free flame-retardant material as described in claim 1 , wherein the halogen-free flame retardant comprises a phosphorus nitrogen flame retardant, aluminum phenylphosphinate, aluminum hypophosphite, melamine cyanurate, a phosphate amine salt, or a phosphate ester.

7. The forming method of a halogen-free flame-retardant material as described in claim 1 , wherein the wear-resistant modifier comprises a siloxane polymer, vinyl polydimethylsiloxane, or a methicone silsesquioxane crosspolymer.

8. The forming method of a halogen-free flame-retardant material as described in claim 1 , wherein the thermoplastic elastomer comprises polyether thermoplastic polyurethane, polyester thermoplastic polyurethane, a polyether thermoplastic polyester elastomer, or a polyester thermoplastic polyester elastomer.

9. The forming method of a halogen-free flame-retardant material as described in claim 1 , wherein the antioxidant comprises bis[3-(1,1-dimethylethyl)-4-hydroxy-5-methylbenzenepropionic acid] tripolyethylene glycol or a hindered phenolic antioxidant.

10. The forming method of a halogen-free flame-retardant material as described in claim 1 , wherein based on 100 parts by weight of the total weight of the mixture, a content of the halogen-free flame retardant is 15 to 45 parts by weight.

11. The forming method of a halogen-free flame-retardant material as described in claim 1 , wherein based on 100 parts by weight of a weight of the thermoplastic elastomer, a content of the wear-resistant modifier is 1 to 10 parts by weight.

12. The forming method of a halogen-free flame-retardant material as described in claim 1 , wherein based on 100 parts by weight of a weight of the thermoplastic elastomer, a content of the antioxidant is 0.2 to 1.5 parts by weight.

13. The forming method of a halogen-free flame-retardant material as described in claim 1 , wherein the first zone of the twin-screw extruder has a temperature of 120° C. to 200° C.

14. The forming method of a halogen-free flame-retardant material as described in claim 1 , wherein the second zone of the twin-screw extruder has a temperature of 120° C. to 200° C.

15. The forming method of a halogen-free flame-retardant material as described in claim 1 , wherein a screw rotation speed in the first zone and the second zone of the twin-screw extruder is 60 rpm to 300 rpm.

Assignees

• Ind Tech Res Inst

Inventors

• Liang Wen-Chung
• Wu Chi-Lang
• Huang Chen-Yu

Classifications

• C09K21/14 Primary

  Macromolecular materials · CPC title

• C08L83/06

  containing silicon bound to oxygen-containing groups (C08L83/12 takes precedence) · CPC title

• C09K21/02 Primary

  Inorganic materials · CPC title

• C08L2201/02

  Flame or fire retardant/resistant · CPC title

• C09K2003/1078

  Fire-resistant, heat-resistant materials · CPC title