I. Introduction
In the polyethylene production process, will produce a small amount of oligomers that is low molecular weight polyethylene, also known as polymer wax referred to as polyethylene wax. Because of its excellent cold resistance, heat resistance, chemical resistance and wear resistance and should be widely used. In normal production, this part of the wax as an additive can be directly added to the polyolefin processing, it can increase the product of the optical translation and processing performance. Polymeric wax is a good anti-allergic agent, but also for plastic, pigment dispersion lubricants, corrugated moisture-proof agent, hot melt adhesives and wax, automotive beauty wax and so on.
Second, the chemical nature
Polyethylene wax R- (CH2-CH2) n-CH3, molecular weight 1000-5000, is a white, odorless, odorless inert substance that can be melted at 104-130 ° C or dissolved in solvent and resin at high temperatures But it will precipitate during cooling, and its fineness is related to the cooling rate: slow cooling to obtain coarse particles (5-10u), rapid cooling to precipitate finer particles (1.5-3u). During the film formation process of the powder coating, when the coating film is cooled, the polyethylene wax is precipitated from the coating liquid to form fine particles, floats on the surface of the coating film, acts as a texture, extinction, smooth, abrasion resistance; Choose fine powder and paint system to get a variety of patterns.
Third, technological development
Micro-powder technology is developed in the past 10 years, a high-tech, generally less than 0.5μm particle size particles called ultra-fine particles below 20μm called micro-particles, ultra-fine particles of the collection known as ultra-fine powder.
There are three main ways to prepare macromolecule particles:
First, starting from the coarse particles, with mechanical crushing method, evaporation condensation method and melting method and other physical methods;
Second, the use of the role of chemical reagents, so that the formation of a variety of dispersed state molecules gradually grow into the desired size of the particles can be divided into two kinds of dispersion and emulsification method;
Third, direct adjustment polymerization or degradation preparation. Such as PMMA powder, controlled molecular weight PP, dispersion polymerization preparation of PS particles, thermal cracking into radiation cracking PTFE powder. We first in the country to prepare PE wax powder, the Shanghai powder engineering pilot base to achieve the advanced level of similar foreign products. The main process is physical. (A) PE Wax powder application
1, paint with polyethylene wax can be prepared high-gloss solvent-based paint water-based paint, powder coating, canned paint, UV curing, metal decorative coatings, can also be used as cardboard and other daily moisture-proof coating.
2, ink, overprint varnish, print ink. PEWax can be used to prepare relief printing water-based ink, solvent gravure ink, lithography / offset printing, ink, cover printing varnish.
3, cosmetics, personal care products. PEWax can be used as a powder, antiperspirant / deodorant raw material.
4, the membrane with powder wax. Coil wax has two requirements: that is, to improve the coating surface slip and hardness, can not affect the paint leveling and sensitivity to water.
5, hot melt adhesive. PEWax powder can be used to prepare hot stamping hot melt adhesive.
In the polyethylene production process, will produce a small amount of oligomers that is low molecular weight polyethylene, also known as polymer wax referred to as polyethylene wax. Because of its excellent cold resistance, heat resistance, chemical resistance and wear resistance and should be widely used. In normal production, this part of the wax as an additive can be directly added to the polyolefin processing, it can increase the product of the optical translation and processing performance. Polymeric wax is a good anti-allergic agent, but also for plastic, pigment dispersion lubricants, corrugated moisture-proof agent, hot melt adhesives and wax, automotive beauty wax and so on.
Second, the chemical nature
Polyethylene wax R- (CH2-CH2) n-CH3, molecular weight 1000-5000, is a white, odorless, odorless inert substance that can be melted at 104-130 ° C or dissolved in solvent and resin at high temperatures But it will precipitate during cooling, and its fineness is related to the cooling rate: slow cooling to obtain coarse particles (5-10u), rapid cooling to precipitate finer particles (1.5-3u). During the film formation process of the powder coating, when the coating film is cooled, the polyethylene wax is precipitated from the coating liquid to form fine particles, floats on the surface of the coating film, acts as a texture, extinction, smooth, abrasion resistance; Choose fine powder and paint system to get a variety of patterns.
Third, technological development
Micro-powder technology is developed in the past 10 years, a high-tech, generally less than 0.5μm particle size particles called ultra-fine particles below 20μm called micro-particles, ultra-fine particles of the collection known as ultra-fine powder.
There are three main ways to prepare macromolecule particles:
First, starting from the coarse particles, with mechanical crushing method, evaporation condensation method and melting method and other physical methods;
Second, the use of the role of chemical reagents, so that the formation of a variety of dispersed state molecules gradually grow into the desired size of the particles can be divided into two kinds of dispersion and emulsification method;
Third, direct adjustment polymerization or degradation preparation. Such as PMMA powder, controlled molecular weight PP, dispersion polymerization preparation of PS particles, thermal cracking into radiation cracking PTFE powder. We first in the country to prepare PE wax powder, the Shanghai powder engineering pilot base to achieve the advanced level of similar foreign products. The main process is physical. (A) PE Wax powder application
1, paint with polyethylene wax can be prepared high-gloss solvent-based paint water-based paint, powder coating, canned paint, UV curing, metal decorative coatings, can also be used as cardboard and other daily moisture-proof coating.
2, ink, overprint varnish, print ink. PEWax can be used to prepare relief printing water-based ink, solvent gravure ink, lithography / offset printing, ink, cover printing varnish.
3, cosmetics, personal care products. PEWax can be used as a powder, antiperspirant / deodorant raw material.
4, the membrane with powder wax. Coil wax has two requirements: that is, to improve the coating surface slip and hardness, can not affect the paint leveling and sensitivity to water.
5, hot melt adhesive. PEWax powder can be used to prepare hot stamping hot melt adhesive.
