Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Pre-expanded polyamide beads, molded polyamide foam, and production method therefor

A foamed molded body and a manufacturing method technology, applied in the field of polyamide pre-expanded particles, can solve the problems of inability to use heat resistance, poor heat resistance, etc., and achieve the effects of improving fusion property and excellent mechanical strength

Pending Publication Date: 2021-02-19
ASAHI KASEI KOGYO KK
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these general-purpose resins are poor in heat resistance, so they cannot be used in parts requiring higher heat resistance, such as automotive parts, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pre-expanded polyamide beads, molded polyamide foam, and production method therefor
  • Pre-expanded polyamide beads, molded polyamide foam, and production method therefor
  • Pre-expanded polyamide beads, molded polyamide foam, and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0157] Embodiments of the present invention are described below by way of examples. However, the scope of the present invention is not limited by the Examples at all.

[0158] Evaluation methods used in Examples and Comparative Examples will be described below.

[0159] (1-1) Moisture content of polyamide pre-expanded particles

[0160] After weighing the amide pre-expanded particles (W0), the particles were spread on a dry fiber sheet (Kim Towel Nippon Paper), and other fiber sheets were used to remove surface-adhered water, followed by weighing (W1). After the polyamide pre-expanded particles were vacuum-dried at 80°C for 6 hours, weighed again (W2), calculated respectively water content (%)=(W1-W2) / W2×100 and surface attached water (%) =(W0-W1) / W2×100.

[0161] (1-2) Moisture content of polyamide pre-expanded particles having a hollow portion or a concave shape portion

[0162] After weighing the polyamide pre-expanded particles (W0), fill the polyamide pre-expanded par...

Embodiment 1

[0197]The polyamide pre-expanded particles of Production Example (A-1) were put into a water-permeable non-woven bag, and immersed in a constant temperature water tank heated to 50° C. for 30 minutes to obtain water-containing polyamide pre-expanded particles. The polyamide pre-expanded particles had a water content of 12%, a surface-attached water content of 7.0%, an average particle diameter (D1) of 2.3 mm, and an average diameter (D2) of independent cells of 0.15 mm.

[0198] The obtained polyamide pre-expanded particles were sealed in an autoclave, and compressed air was introduced for 1 hour until the pressure in the autoclave reached 0.4 MPa, and then the pressure was maintained at 0.4 MPa for 24 hours, thereby pre-expanding the polyamide. The pellets are subjected to pressure treatment.

[0199] Fill the pressure-treated polyamide pre-expanded particles into the cavity of the in-mold molding mold (the dimensions of the cavity are vertical: 300mm, horizontal: 300mm, and ...

Embodiment 2

[0202] The polyamide pre-expanded particles of Production Example (A-1) were packed into a water-permeable non-woven bag, immersed in a constant temperature water tank heated to 50°C for 5 minutes, and then carried out at 1000rpm / min by a dehydrator for 3 minutes. Dehydration treatment to obtain water-containing polyamide pre-expanded particles. The polyamide pre-expanded particles had a moisture content of 7.4%, a surface adhesion moisture content of 7.5%, an average particle diameter (D1) of 2.3 mm, and an average diameter (D2) of independent cells of 0.15 mm.

[0203] The obtained polyamide pre-expanded particles were sealed in an autoclave, and compressed air was introduced for 1 hour until the pressure in the autoclave reached 0.4 MPa, and then the pressure was maintained at 0.4 MPa for 24 hours, thereby pre-expanding the polyamide. The pellets are subjected to pressure treatment.

[0204] Fill the pressure-treated polyamide pre-expanded particles into the cavity of the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
The average particle sizeaaaaaaaaaa
Average diameteraaaaaaaaaa
Bending strengthaaaaaaaaaa
Login to View More

Abstract

The pre-expanded polyamide beads of the present invention are characterized by giving a DSC curve when heated with a differential scanning calorimeter from 30 DEG C to 280 DEG C under the conditions of a heating rate of 10 DEG C / min, the DSC curve having a maximum endothermic-peak temperature of 150-275 DEG C and a maximum endothermic-peak width of 30-80 DEG C, the maximum endothermic-peak width corresponding to the difference between an extrapolated melting initiation temperature, which is the temperature corresponding to the intersection of a baseline and a tangent to the curve at a lower-temperature-side inflection point in the maximum endothermic peak, and an extrapolated melting termination temperature, which is the temperature corresponding to the intersection of the baseline and a tangent to the curve at a higher-temperature-side inflection point in the maximum endothermic peak, the baseline being a straight line obtained by approximating the portion of the DSC curve which is located on the higher-temperature side of the maximum endothermic peak and which indicates that the melting has been completed.

Description

technical field [0001] The invention relates to polyamide pre-expanded particles, a polyamide foamed molded body and a manufacturing method thereof. Background technique [0002] Resin foam materials are used as structural materials for parts of automobiles or electronic equipment, and containers as substitutes for existing solid resin materials and metal materials. These resin foams have low density, high thermal insulation, and cushioning properties, and these properties are effectively utilized. [0003] General-purpose resins such as polyethylene, polystyrene, and polypropylene, which are excellent in lightness and impact resistance, are used in existing resin foam materials, and foamed molded products of these general-purpose resins are suitable for cushioning materials and the like. However, these general-purpose resins are poor in heat resistance, and thus cannot be used in parts requiring higher heat resistance, such as automotive parts and the like. [0004] On th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08J9/16
CPCC08J9/228C08J2377/00C08J9/16C08J2377/06C08J9/232C08J9/22C08J2201/034C08L77/06
Inventor 藤野能宜中山遼太河津泰幸
Owner ASAHI KASEI KOGYO KK
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com