News Details
Coating polyolefins crosslinking agent
2017-5-22 23:51:46
Coating polyolefins crosslinking agent
The polyolefin, which can be recycled, can improve its tensile properties, heat resistance, environmental resistance, dimensional stability, abrasion resistance and chemical resistance.
There are three types of crosslinking: radiation crosslinking, chemical crosslinking, organic silicon crosslinking.
The crosslinking degree of the polymer can be controlled by the amount of crosslinking agent or irradiation time. The crosslinking degree is different and its mechanical properties are different. Light crosslinked polyolefin can be thermoplastic and easy to process; Crosslinked polymers, which form a three-dimensional network structure, become thermosetting materials.
Therefore, the modification processing method has two kinds: (1) on polymer softening point, to join the crosslinking agent, mixing, under the condition of below the decomposition temperature cross-linking agent for granulation, finally forming and crosslinking reaction step is complete; It is formed when the temperature is lower than the crosslinking agent and then completes the crosslinking at higher than the cross-linked temperature.
The more advanced technology is the use of reactive extrusion technology, polymer and crosslinking agent mixed in twin screw extruder and crosslinking reaction, and directly into products, such as the pipe.
Polyethylene cross linking modification. It is called crosslinked polyethylene (polyethylene) for the high density polyethylene and low density polyethylene. There are three types of crosslinked polyethylene.
(1) when the radiation crosslinked polyethylene is formed into a cable, film, or other parts, it is cross-linked with high energy ray irradiation, such as electron, alpha ray, beta ray, gamma ray, etc.
(2) chemical crosslinking polyethylene and organic peroxide and other additives are combined with mixed and formed granules, and then processed into products and then processed by heat treatment.
(3) organosilicon crosslinking polyethylene with organic peroxide and organic silicon blending graft, granulation, with 5% of the total of organotin catalyst polyethylene mixing, molding processing into products, and finally by the heat treatment of crosslinking. This method is also a chemical crosslinking.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
If mild crosslinking is adopted, the mechanical properties can be improved moderately while maintaining thermoplastic condition, and can be reused after abandonment. If it is fully cross-linked, it is characterized by a network structure that is hot and solid, with outstanding abrasion resistance and stress cracking, non-toxic, odorless and non-absorbent. Low temperature flexibility, softening point 200 ℃, can be long-term use under 140 ℃; The impact strength, tensile strength, creep resistance and rigidity are all over HDPE, and the elastic modulus is five times higher than HDPE. Electrical insulation and chemical stability are excellent, the thin film is transparent and sufficient water vapor permeability. But it can not be formed again, can be machined again.
Thin film used for food packaging, heat shrinkable film, construction and agricultural use, cable insulation and sheath, pipes and containers, all kinds of heat resistant, resistant to corrosion medium rockets, missiles, mechanical and electrical products and high voltage, high frequency dielectric materials.
For example, the chemical crosslinking of polyethylene is modified. Under the proper temperature, with dicumyl peroxide (DCP) as crosslinking agent, the DCP with screw extruder and recycled PE blending and crosslinking, control the temperature of 170 ~ 180 ℃, screw length to diameter ratio with 35 advisable. The polyethylene can be used for thermoplastic processing and improves the performance of polyethylene.
Polyvinyl chloride cross-linked modification. PVC (PVC) is one of the earliest and most widely used plastic varieties in China. Because the PVC has of reactants, the advantages of low cost, good formability, its products are widely used in building decoration, agricultural film, the automotive industry, wire and cable, daily necessities and other fields.
But PVC is heat-sensitive material, there are poor heat resistance, aging resistance and deformation resistance, abrasion resistance, electric breakdown resistance and poor mechanical strength of faults, seriously restrict the further application of PVC. The crosslinking method can overcome these shortcomings and improve the class of PVC products.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The polyolefin, which can be recycled, can improve its tensile properties, heat resistance, environmental resistance, dimensional stability, abrasion resistance and chemical resistance.
There are three types of crosslinking: radiation crosslinking, chemical crosslinking, organic silicon crosslinking.
The crosslinking degree of the polymer can be controlled by the amount of crosslinking agent or irradiation time. The crosslinking degree is different and its mechanical properties are different. Light crosslinked polyolefin can be thermoplastic and easy to process; Crosslinked polymers, which form a three-dimensional network structure, become thermosetting materials.
Therefore, the modification processing method has two kinds: (1) on polymer softening point, to join the crosslinking agent, mixing, under the condition of below the decomposition temperature cross-linking agent for granulation, finally forming and crosslinking reaction step is complete; It is formed when the temperature is lower than the crosslinking agent and then completes the crosslinking at higher than the cross-linked temperature.
The more advanced technology is the use of reactive extrusion technology, polymer and crosslinking agent mixed in twin screw extruder and crosslinking reaction, and directly into products, such as the pipe.
Polyethylene cross linking modification. It is called crosslinked polyethylene (polyethylene) for the high density polyethylene and low density polyethylene. There are three types of crosslinked polyethylene.
(1) when the radiation crosslinked polyethylene is formed into a cable, film, or other parts, it is cross-linked with high energy ray irradiation, such as electron, alpha ray, beta ray, gamma ray, etc.
(2) chemical crosslinking polyethylene and organic peroxide and other additives are combined with mixed and formed granules, and then processed into products and then processed by heat treatment.
(3) organosilicon crosslinking polyethylene with organic peroxide and organic silicon blending graft, granulation, with 5% of the total of organotin catalyst polyethylene mixing, molding processing into products, and finally by the heat treatment of crosslinking. This method is also a chemical crosslinking.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
If mild crosslinking is adopted, the mechanical properties can be improved moderately while maintaining thermoplastic condition, and can be reused after abandonment. If it is fully cross-linked, it is characterized by a network structure that is hot and solid, with outstanding abrasion resistance and stress cracking, non-toxic, odorless and non-absorbent. Low temperature flexibility, softening point 200 ℃, can be long-term use under 140 ℃; The impact strength, tensile strength, creep resistance and rigidity are all over HDPE, and the elastic modulus is five times higher than HDPE. Electrical insulation and chemical stability are excellent, the thin film is transparent and sufficient water vapor permeability. But it can not be formed again, can be machined again.
Thin film used for food packaging, heat shrinkable film, construction and agricultural use, cable insulation and sheath, pipes and containers, all kinds of heat resistant, resistant to corrosion medium rockets, missiles, mechanical and electrical products and high voltage, high frequency dielectric materials.
For example, the chemical crosslinking of polyethylene is modified. Under the proper temperature, with dicumyl peroxide (DCP) as crosslinking agent, the DCP with screw extruder and recycled PE blending and crosslinking, control the temperature of 170 ~ 180 ℃, screw length to diameter ratio with 35 advisable. The polyethylene can be used for thermoplastic processing and improves the performance of polyethylene.
Polyvinyl chloride cross-linked modification. PVC (PVC) is one of the earliest and most widely used plastic varieties in China. Because the PVC has of reactants, the advantages of low cost, good formability, its products are widely used in building decoration, agricultural film, the automotive industry, wire and cable, daily necessities and other fields.
But PVC is heat-sensitive material, there are poor heat resistance, aging resistance and deformation resistance, abrasion resistance, electric breakdown resistance and poor mechanical strength of faults, seriously restrict the further application of PVC. The crosslinking method can overcome these shortcomings and improve the class of PVC products.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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