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

Open-cell polyurethane negative poisson ratio foam material and preparation method thereof

A technology of polyurethane foam and negative Poisson's ratio, applied in coating and other directions, can solve problems such as uneven structure of inner and outer layers, and achieve the effect of avoiding uneven structure of inner and outer layers of materials, broad market prospects and excellent mechanical properties.

Active Publication Date: 2022-01-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
View PDF11 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is limited by the inhomogeneity of the inner and outer layers caused by the size of the polymer and the temperature gradient.

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
  • Open-cell polyurethane negative poisson ratio foam material and preparation method thereof
  • Open-cell polyurethane negative poisson ratio foam material and preparation method thereof
  • Open-cell polyurethane negative poisson ratio foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The invention provides a method for preparing an open-cell polyurethane negative Poisson's ratio foam material, comprising the following steps:

[0027] The open-cell polyurethane foam is sequentially compressed, pressurized saturated water vapor is heated and cooled to shape, and the open-cell polyurethane negative Poisson's ratio foam material is obtained.

[0028] In the preparation method provided by the present invention, as long as the open-cell polyurethane foam satisfies that the cells have an open-cell structure and Poisson's ratio ≥ 0, there is no special limitation; the open-cell polyurethane foam can be polyether polyurethane foam , can also be a polyester polyurethane foam, preferably a polyether polyurethane foam; the open cell structure of the open cell polyurethane foam can be a full open cell structure, and can also be a semi open cell structure; the open cell polyurethane foam The density is preferably 10-300kg / m 3 , more preferably 20-120kg / m 3 , sp...

Embodiment 1

[0054] Set the density to 10kg / m 3 The open-cell polyurethane foam (self-made, formula shown in Table 1, Poisson’s ratio is 0.5, size is 16cm×10cm×7cm) is subjected to triaxial compression treatment, the compression ratio is 5.0 times, and the size after compression is 9.37cm×5.85cm×4.09 cm, put the compressed foam together with the compression mold in the water vapor penetrating heating device, use 170°C high-pressure saturated steam to heat through one side for 5 seconds, and then take it out together with the compression mold and cool it to room temperature. After testing, the Poisson's ratio of the surface layer and the core layer of the foam material is uniform, and the Poisson's ratio is -1.0.

[0055] figure 2 It is a scanning electron microscope image of the foam material provided by Example 1 of the present invention, Figure a is a scanning electron microscope image of a foam core layer, and Figure b is a scanning electron microscope image of a foam surface layer. ...

Embodiment 2

[0061] Set the density to 23kg / m 3 The open-cell polyurethane foam (Dongguan Hengying Sponge Products Co., Ltd., Poisson’s ratio is 0.4, the size is 16cm×10cm×7cm) is subjected to triaxial compression treatment, the compression ratio is 3.4 times, and the compressed size is 10.65cm×6.65cm ×4.65cm, put the compressed foam together with the compression mold in the steam penetrating heating device, and use 165°C high-pressure saturated water vapor to repeatedly penetrate and heat both sides for 60s (specifically: after the left side penetrates for 30s, switch to the right Side penetration 30s), and then take out together with the compression mold and cool to room temperature. After testing, the Poisson's ratio of the surface layer and the core layer of the foam material is uniform, and the Poisson's ratio is -0.7.

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
Densityaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of functional polymer foam materials, and particularly relates to an open-cell polyurethane negative poisson ratio foam material and a preparation method thereof. The open-cell polyurethane negative poisson ratio foam material provided by the invention is prepared from open-cell polyurethane foam through compression, pressurized saturated steam penetration heating and cooling shaping in sequence, wherein the poisson ratio of the open-cell polyurethane foam is greater than or equal to 0, the pressurized saturated steam penetration heating temperature is 130-200 DEG C, and the time is 5-300 seconds. According to the technical scheme provided by the invention, an open-cellpolyurethane foam base material is subjected to compression and pressurized saturated steam penetration heating treatment, so that the negative poisson ratio foam material with uniform internal and external structures and excellent mechanical properties can be obtained; and the technical problems that an existing negative poisson ratio polymer foam material preparation technology is low in production efficiency and not beneficial to large-scale production are effectively solved while the phenomenon that internal and external structures of the material are not uniform due to temperature gradient is effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of functional polymer foam materials, and in particular relates to an open-cell polyurethane negative Poisson's ratio foam material and a preparation method thereof. Background technique [0002] Poisson's ratio refers to the ratio of transverse shrinkage strain to longitudinal tensile strain when a material is subjected to unidirectional tension or compression. In almost all materials, Poisson's ratio is usually positive, such as: aluminum is 0.33, copper is 0.27, and typical polymer foam is 0.11 to 0.14. The negative Poisson's ratio material means that it expands laterally when stretched and shrinks laterally when compressed, which is mainly due to its special internal structure. Negative Poisson's ratio materials have unique advantages, such as high notch resistance, fracture resistance, high shear modulus, high resilience toughness and high energy absorption performance, etc., in cushioning materials, s...

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): C08J9/36C08L75/08C08L75/06
CPCC08J9/36C08J2375/06C08J2375/08
Inventor 李明罡李聂鑫姜治伟樊东蕾唐涛
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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