Material, method for producing the material, partially welded material, composite material, and method of producing molded product

Patent metadata

Field	Value
Publication number	US-2020002484-A1
Application number	US-201816493521-A
Country	US
Kind code	A1
Filing date	Mar 1, 2018
Priority date	Mar 15, 2017
Publication date	Jan 2, 2020
Grant date	—

Abstract

A material including: a first region, a fiber region, and a second region continuously in a thickness direction; the first region and the second region being each independently a resin layer including from 20 to 100 mass % of a thermoplastic resin component and from 80 to 0 mass % of reinforcing fibers; the fiber region including from 20 to 100 mass % of thermoplastic resin fibers and from 80 to 0 mass % of reinforcing fibers; the thermoplastic resin component included in the first region and the thermoplastic resin component included in the second region each independently having a crystallization energy during temperature increase of 2 J/g or greater, measured by differential scanning calorimetry; and the thermoplastic resin fibers included in the fiber region having a crystallization energy during temperature increase of less than 1 J/g, measured by differential scanning calorimetry; wherein the crystallization energy during temperature increase is a value measured by using a differential scanning calorimeter (DSC) in a nitrogen stream while heating is performed from 25° C. to a temperature that is 20° C. higher than a melting point of the thermoplastic resin component or the thermoplastic resin fibers at a temperature increase rate of 10° C./min.

First claim

1 . A material comprising:
a first region, a fiber region, and a second region continuously in a thickness direction; the first region and the second region being each independently a resin layer including from 20 to 100 mass % of a thermoplastic resin component and from 80 to 0 mass % of reinforcing fibers; the fiber region including from 20 to 100 mass % of thermoplastic resin fibers and from 80 to 0 mass % of reinforcing fibers; the thermoplastic resin component included in the first region and the thermoplastic resin component included in the second region each independently having a crystallization energy during temperature increase of 2 J/g or greater, measured by differential scanning calorimetry; and the thermoplastic resin fibers included in the fiber region having a crystallization energy during temperature increase of less than 1 J/g, measured by differential scanning calorimetry; wherein the crystallization energy during temperature increase is a value measured by using a differential scanning calorimeter (DSC) in a nitrogen stream while heating is performed from 25° C. to a temperature that is 20° C. higher than a melting point of the thermoplastic resin component or the thermoplastic resin fibers at a temperature increase rate of 10° C./min.

2 . The material according to claim 1 , wherein 80 mass % or greater of compositions of the thermoplastic resin component included in the first region, the thermoplastic resin component included in the second region, and the thermoplastic resin fibers included in the fiber region are identical to each other.

3 . The material according to claim 1 , wherein the thermoplastic resin component included in the first region, the thermoplastic resin component included in the second region, and the thermoplastic resin fibers included in the fiber region each independently include a polyamide resin.

4 . The material according to claim 1 , wherein the thermoplastic resin component included in the first region, the thermoplastic resin component included in the second region, and the thermoplastic resin fibers included in the fiber region each independently include a polyamide resin including a constituent unit derived from diamine and a constituent unit derived from dicarboxylic acid, and 50 mol % or greater of the constituent unit derived from diamine is derived from xylylenediamine.

5 . The material according to claim 1 , wherein the fiber region includes from 25 to 80 mass % of thermoplastic resin fibers and from 75 to 20 mass % of reinforcing fibers.

6 . The material according to claim 1 , wherein the first region, the second region, and the fiber region each independently include from 25 to 80 mass % of a thermoplastic resin component and from 75 to 20 mass % of reinforcing fibers.

7 . The material according to claim 6 , wherein a difference in mass portion among the reinforcing fibers included in the first region, the second region, and the fiber region is 5 mass % or less.

8 . The material according to claim 5 , wherein the reinforcing fibers include at least one selected from the group consisting of carbon fibers and glass fibers.

9 . The material according to claim 5 , wherein the reinforcing fibers are continuous reinforcing fibers.

10 . The material according to claim 9 , wherein the fiber region includes commingled yarn including the continuous reinforcing fibers and the thermoplastic resin fibers.

11 . The material according to claim 9 , wherein the first region and the second region are formed from commingled yarn including the continuous reinforcing fibers and the thermoplastic resin fibers.

12 . The material according to claim 1 , wherein a difference between the crystallization energy during temperature increase of the thermoplastic resin component included in the first region and the crystallization energy during temperature increase of the thermoplastic resin fibers included in the fiber region and a difference between the crystallization energy during temperature increase of the thermoplastic resin component included in the second region and the crystallization energy during temperature increase of the thermoplastic resin fibers included in the fiber region are each independently 3 J/g or greater.

13 . The material according to claim 1 , wherein a thickness of the fiber region relative to a total thickness of the material is 20% or greater.

14 . The material according to claim 1 , wherein the material is a material for light forming or a material for microwave forming.

15 . The material according to claim 1 , wherein a deformation resistance load is 1 N or less,
the deformation resistance load being a load applied to the material to pull the material up at a rate of 300 mm/min through a guide that changes a traveling direction of the material by 90 degrees.

16 . The material according to claim 1 , wherein a thermal shrinkage ratio after heating is performed at a temperature that is 5° C. higher than the melting point of the thermoplastic resin fibers for 1 minute is 1% or less.

17 . The material according to claim 1 , wherein the material is in a tape shape.

18 . A partially welded material in which at least two materials described in claim 1 are partially welded.

19 . A method for producing the material described in claim 1 , the method comprising applying ultrasonic vibration on a surface of fibers arranged in at least one direction, the fibers including from 20 to 100 mass % of thermoplastic resin fibers and from 80 to 0 mass % of reinforcing fibers.

20 . A composite material comprising:
the material described in claim 1 , and second thermoplastic resin fibers that retain a shape of the material or the partially welded material; wherein the second thermoplastic resin fibers have a melting point that is at least 15° C. higher than a melting point of thermoplastic resin fibers included in the material or the partially welded material.

21 . A method for producing a molded product, the method comprising subjecting the material described in claim 1 to light forming or microwave forming.

Assignees

• Mitsubishi Gas Chemical Co

Inventors

• Nakai Asami
• Kaji Masataka
• Takagi Mitsuro
• Matsumoto Nobuhiko

Classifications

• C08G69/28

  Preparatory processes · CPC title

• B29K2309/08

  Glass · CPC title

• D10B2101/06

  Glass · CPC title

• D10B2331/021

  aromatic polyamides, e.g. aramides · CPC title

• B32B5/12

  characterised by the relative arrangement of fibres or filaments of {different layers, e.g. the fibres or filaments being parallel or perpendicular to each other} · CPC title