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

Method for testing crosslinking degree of crosslinked polyethylene

A technology of cross-linked polyethylene and testing methods, applied in the direction of applying stable tension/pressure to test material strength, measuring devices, strength characteristics, etc., can solve the problems of toxic test time, long (8h, etc.), and achieve difficult decomposition, The effect of chemical stability

Pending Publication Date: 2020-07-03
威海联桥新材料科技股份有限公司
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cross-linked polyethylene (PEX) is now widely used in various pipes. The degree of cross-linking of PEX is one of the criteria to characterize the quality of the product. The higher the degree of cross-linking, the better the performance of the product. Now the degree of cross-linking of PEX is usually measured by Gel content to determine the degree of cross-linking is to extract the sample in a selected solvent (xylene, etc.) for a period of time (about 8h), and weigh the mass before and after extraction to calculate the gel content. The advantages of this method are The test result is accurate, but the disadvantage is that it needs to use toxic xylene and the test time is long (8h). In the actual production process, a convenient and fast cross-linking degree test method suitable for the production line is needed that can quickly detect the cross-linking degree of the product.

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
  • Method for testing crosslinking degree of crosslinked polyethylene
  • Method for testing crosslinking degree of crosslinked polyethylene
  • Method for testing crosslinking degree of crosslinked polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Select a pipe with a cross-linking degree range of 0-10%, an outer diameter of 1.5±0.05cm, and an inner diameter of 1.0±0.05cm, and heat the middle of the pipe with a heating zone width of 2cm and a heating temperature of 200℃ , Set blocks at both ends of the heating area to ensure that the outside of the heating area is not heated.

[0032] (2) Use a universal tensile testing machine to break the heated pipe in step (1) at a rate of 500mm / min. After the pipe is completely cooled, take a picture of the fracture surface, such as figure 1 The length of the heating zone after fracture, the radial size after the heating zone is broken, and the morphological characteristics of the fracture are recorded.

Embodiment 2

[0034] Select a pipe with a cross-linking degree range of 10-20%, an outer diameter of 1.5±0.05 cm, and an inner diameter of 1.0±0.05 cm. The heating area, heating temperature and breaking method of the pipe are the same as those in Example 1. The radial direction generated when the pipe is heated The shape of expansion and axial contraction is like image 3 Shown. After the pipe is completely cooled, take a picture of its fracture surface, such as figure 2 As shown, and record the length of the heated area after fracture, the radial size of the heated area after fracture, and the morphological characteristics of the fracture.

Embodiment 3

[0036] Select a pipe with a cross-linking degree of 20-30%, an outer diameter of 1.5±0.05cm, and an inner diameter of 1.0±0.05cm. The heating area, heating temperature and breaking method of the pipe are the same as those in Example 1. After the pipe is completely cooled, Take pictures of its fracture topography, such as Figure 4 As shown, the length of the heated area after fracture, the radial size of the heated area after fracture, and the morphological characteristics of the fracture are recorded.

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
temperatureaaaaaaaaaa
lengthaaaaaaaaaa
sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for testing the crosslinking degree of crosslinked polyethylene. The technical problem that an existing cross-linking degree testing method is tedious and inaccuratein step is solved. The method comprises the following steps: (1) establishing a database, namely heating, snapping or manually tearing crosslinked polyethylene samples with different crosslinking degrees, photographing the fracture morphology after snapping or tearing, recording a corresponding heating area and radial deformation, summarizing test data parameters and arranging the test data parameters into the database; (2) detection of a to-be-detected sample: heating the to-be-detected sample, arranging baffles on the two sides of a heating area to control the size of the heating area, and pulling apart or pulling apart the to-be-detected sample according to the mode in the step (1); and (3) observation and matching: observing and measuring the macroscopic morphology and parameters of the heating area and fracture of the sample to be tested in the step (2), matching the macroscopic morphology and parameters with database parameters to obtain the crosslinking degree range of the sample to be tested, and further obtaining the specific crosslinking degree. The method can be widely applied to the technical field of cross-linking degree testing methods.

Description

Technical field [0001] The invention relates to the field of material detection, in particular to a method for testing the degree of crosslinking of crosslinked polyethylene. Background technique [0002] Polyethylene (PE) cross-linking technology is one of the important means to improve its material properties. The cross-linked modified PE can greatly improve its performance, which not only significantly improves the mechanical properties, environmental stress cracking resistance, chemical corrosion resistance, creep resistance and electrical properties of PE, but also The temperature resistance level is significantly improved, and the heat resistance temperature of PE can be increased from 70°C to above 100°C, which greatly broadens the application fields of PE. Cross-linked polyethylene (PEX) is now widely used in all kinds of pipes. The degree of cross-linking of PEX is one of the criteria for characterizing the quality of the product. The higher the degree of cross-linking,...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/18G01N3/06
CPCG01N3/08G01N3/18G01N3/068G01N2203/0017G01N2203/0226G01N2203/0641
Inventor 刘福平姜鹏刘春波薛刚刘涛
Owner 威海联桥新材料科技股份有限公司
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