Long glass fiber manufacturing method, and long glass fiber

Patent metadata

Field	Value
Publication number	US-12110249-B2
Application number	US-202218692530-A
Country	US
Kind code	B2
Filing date	Oct 4, 2022
Priority date	Dec 27, 2021
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

A method for manufacturing glass long fiber using recovered glass fiber, capable of manufacturing glass long fiber in which a recycle rate is increased, increase of a liquid phase temperature of molten glass and narrowing of an operating temperature range of the molten glass are suppressed, and a spinning temperature is low. The method includes a glass melting step of melting a glass raw material containing glass fiber recovered from a glass fiber-reinforced resin molded product, and a glass fiber mineral material to obtain molten glass; and a spinning step of spinning the molten glass to obtain glass long fiber, and a content of the recovered glass fiber in the glass raw material is in the range of 11 to 75% by mass, and differences in the contents of SiO 2 , Al 2 O 3 , B 2 O 3 , and CaO between the glass fiber mineral material and the recovered glass fiber satisfy a prescribed relationship.

First claim

The invention claimed is:

1. A method for manufacturing glass long fiber, comprising:
a glass melting step of melting a glass raw material containing glass fiber recovered from a glass fiber-reinforced resin molded product, and a glass fiber mineral material to obtain molten glass; and
a spinning step of spinning the molten glass to obtain glass long fiber,
wherein a content of the glass fiber recovered from the glass fiber-reinforced resin molded product in the glass raw material is in a range of 11 to 75% by mass, the glass long fiber is spun in such a manner as to contain, with respect to a total amount of the glass long fiber, SiO 2 in a range of 48.00 to 62.00% by mass, Al 2 O 3 in a range of 12.00 to 21.40% by mass, B 2 O 3 in a range of 0.10 to 15.00% by mass, CaO in a range of 10.00 to 22.50% by mass, MgO in a range of 1.30 to 10.00% by mass, and P 2 O 5 , TiO 2 , and ZnO in a range of 0.01 to 10.00% by mass in total, and
following expression (1) is satisfied:
5.2≤ S+A−B−C≤ 46.9  (1)

wherein S, A, B, and C are defined as follow:
S=[a content (% by mass) of SiO 2 with respect to a total amount of the glass fiber mineral material]−[a content (% by mass) of SiO 2 with respect to a total amount of the glass fiber recovered from the glass fiber-reinforced resin molded product];
A=[a content (% by mass) of Al 2 O 3 with respect to the total amount of the glass fiber mineral material]−[a content (% by mass) of Al 2 O 3 with respect to the total amount of the glass fiber recovered from the glass fiber-reinforced resin molded product];
B=[a content (% by mass) of B 2 O 3 with respect to the total amount of the glass fiber mineral material]−[a content (% by mass) of B 2 O 3 with respect to the total amount of the glass fiber recovered from the glass fiber-reinforced resin molded product]; and
C=[a content (% by mass) of CaO with respect to the total amount of the glass fiber mineral material]−[a content (% by mass) of CaO with respect to the total amount of the glass fiber recovered from the glass fiber-reinforced resin molded product].

2. The method for manufacturing glass long fiber according to claim 1 , wherein following expression (2) is satisfied:
10.8≤ S+A−B−C≤ 34.3  (2)

wherein S, A, B, and C are defined the same as above.

3. The method for manufacturing glass long fiber according to claim 1 , wherein the content of the glass fiber recovered from the glass fiber-reinforced resin molded product in the glass raw material is in a range of 15 to 60% by mass.

4. The method for manufacturing glass long fiber according to claim 1 , wherein following expression (3) is satisfied:
14.9≤ S+A−B−C≤ 32.4  (3)

wherein S, A, B, and C are defined the same as above.

5. The method for manufacturing glass long fiber according to claim 4 , wherein following expression (4) is satisfied:
21.9≤ S+A−B−C≤ 30.4  (4)

wherein S, A, B, and C are defined the same as above.

Assignees

• Nitto Boseki Co Ltd

Inventors

• Nukui Yosuke

Classifications

• B09B3/29

  involving a melting or softening step · CPC title

• C03B37/02

  by drawing or extruding, {e.g. direct drawing of molten glass from nozzles; Cooling fins therefor (C03B37/04 takes precedence; sizing of the fibres C03C25/00)} · CPC title

• C03C13/06

  Mineral fibres, e.g. slag wool, mineral wool, rock wool · CPC title

• C03C1/002

  Use of waste materials, e.g. slags · CPC title

• C03B5/005

  of glass-forming waste materials (disposal or transformation of solid waste in general B09B; treatment of radioactive waste G21F9/00) · CPC title