Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Method for producing grafted polyolefin materials rapidly by photoirradiation

A polyolefin and photografting technology, applied in the field of fast photografting polyolefin materials, can solve the problems of difficult continuous implementation, low graft conversion efficiency, etc., achieve short photopolymerization time, improve hydrophilic performance, and significantly economical The effect of benefit and social benefit

Inactive Publication Date: 2005-11-09
SICHUAN UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, monomers are easy to polymerize into homopolymers, the conversion efficiency of grafting is low, and it is difficult to implement continuously
(3) Continuous liquid phase method: In 1986, B.Rnby et al. used a traction system to make the polymer film or fiber continuously soak through the reaction solution (monomer, photosensitizer solution) and then carry out graft polymerization under light, realizing the Continuous operation, but this method is limited to products that can be drawn continuously such as film or fiber, and is not suitable for powdery or granular polymer raw materials

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve 0.5 g of benzophenone in 9.5 g of acetone to prepare a 10% solution, then add 1 g of methacrylic acid and stir to mix evenly. After adding 100 grams of low-density polyethylene powder with an average particle size of 189 μm into a mixer with a stirrer and a thermometer, slowly add the above-mentioned solution, stir vigorously for 5 minutes, and then stand for 4 to 5 hours for later use. The above mixture was placed in the reaction chamber, and irradiated for 20 minutes at a temperature of 20-25° C., an ultraviolet lamp power of 1000 W, and a wavelength of 265 nm. The measured grafting rate was 0.51%. Compared with ungrafted low-density polyethylene, the bonding strength of grafted low-density polyethylene to polyethylene and steel is greatly enhanced, and the peel strength of the bonded sample is increased from 3.98N / cm of ungrafted sample to 29.56N / cm, increased by 7.6 times.

Embodiment 2

[0023] Dissolve 2.0 g of benzophenone in 8.0 g of acetone to prepare a 10% solution, then add 2.0 g of acrylic acid and stir to mix evenly. Add 100 grams of linear low-density polyethylene powder with an average particle size of 226 μm into a mixer with a stirrer and a thermometer, then slowly add the above-mentioned solution, stir vigorously for 8 minutes, and then put it into an oven at a temperature of 80°C After half an hour of treatment, the monomer and linear low-density polyethylene powder are fully infiltrated, and then stand for 4-5 hours for later use. The above mixture was moved into the reaction chamber, and irradiated for 5, 10, 15, 20 and 30 minutes at a temperature of 50 ° C, a UV lamp power of 500 W, and a wavelength of 365 nm. The measured grafting rate and bonding performance are shown in Table 1. .

Embodiment 3

[0025] 2 grams of benzoin dimethyl ether, 5 grams of acrylic acid and 20 grams of toluene were formulated into a solution, added to the same equipment as in Example 1, and after vigorously stirring with 100 grams of high-density polyethylene powder with a particle size of 257 μm for 10 minutes, placed in 105 Pretreat in an oven at ℃ for 1 hour, move it into the reaction chamber, and irradiate for 10 minutes at a temperature of 70°C with a Ga-I ultraviolet lamp power of 500W and a wavelength of 365nm to obtain high-density polyethylene grafted materials. Use grafted high-density polyethylene as a hot melt adhesive to coat the surface of the steel sheet at 180°C, and then bond it with the high-density polyethylene sheet at 180°C, and test the bonded samples according to GB 7124 and GB 2792 respectively The shear strength and peel strength are respectively: 1.7MPa and the high-density polyethylene body rupture, that is, the adhesive shear peel strength is higher than the high-dens...

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
peel strengthaaaaaaaaaa
peel strengthaaaaaaaaaa
peel strengthaaaaaaaaaa
Login to View More

Abstract

A method of optically grafting polyethylene quickly. It comprises: putting grafted monomers, photoinitiator, solvent, polyethylene powder with the average particle size of 50nm-0.5mm into a mixer containing stirrer and thermometer, stirring and mixing uniformly, standing for 1-6 hours; adding the mixture into a reactive chamber, irradiating with ultraviolet radiation at the wave length of 200-400nm for 2-120 mins, at the temperature of 20-120degree C, with the power of 5-200W / cm, then getting grafted polyethylene.

Description

1. Technical field [0001] The invention relates to a method for rapid photografting of polyolefin materials, which belongs to the field of polymer material modification. 2. Background technology [0002] Polyolefin materials have the advantages of large quantity, low price, and convenient molding and processing, and have been widely used as general-purpose polymer materials. However, due to its molecular structure without polar groups, its surface energy is low, its biocompatibility is poor, its bonding strength with adhesives or coatings is low, and its dyeability is poor. In order to overcome these shortcomings and expand its application fields, scholars at home and abroad have adopted a variety of methods to modify its surface. At present, the main methods are: surface oxidation methods such as flame, corona discharge, glow discharge or acid etching, surfactant method and surface graft polymerization. [0003] Among the above methods, surface grafting modification is 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
Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/00
Inventor 雷景新李启满高峻
Owner SICHUAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
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