Wuhan Hyundai.PVDC blown film raw material preparation
DATE：2020/4/6 8:55:14 / READ： / SOURCE：This station
Wuhan Hyundai.PVDC blown film raw material preparation
Generally speaking, the gas permeation phenomenon is composed of the dissolution of gas molecules → diffusion-desorption process, the molecular part causes the phenomenon of dissolution and diffusion, PVDC is a crystalline polymer, the crystal part is 30% -45%, part is 55% to 70%, the non-crystalline part has high electronegative chlorine atom content and tight molecular structure, so the gas solubility is low and the diffusion rate is slow, so the PVDC gas permeability is low. In addition, the molecular structure of PVDC does not have permanently polar groups. Unlike PA and PVA resins with hydrophilic groups, moisture does not affect gas permeability at all. It is composed of vinylidene chloride and vinyl chloride or alkyl acrylic acid. The copolymer of the copolymer is poor in thermal stability. The best volume of plasticizer and thermal stabilizer, but the addition of plasticizer, the barrier property is reduced, so it should be added less, and even the development of www.handern .com breathable membrane equipment
(1) Plasticizers for PVDC Due to the difficulty of processing PVDC, plasticizers need to be added. There are three types of plasticizers that can be used, namely adipic acid esters, including dibutyl ester and dioctyl ester; b decane Acid esters, including dibutyl ester and dioctyl ester; c citrate esters, including acetyl trioctyl, acetyl tributyl ester. These plasticizers can act alone or in combination, www.handern.com breathable membrane equipment
The used amount is 0.5% -10% (mass fraction) of the total monomer amount. Below this usage level, it is difficult to remove residual monomers, resulting in processing difficulties. Above the above usage level, monomers are easily removed and processability is improved, but the gas barrier properties of the product are reduced. In order to remove monomers while maintaining high gas For barrier property, the amount of plasticizer is preferably 1.0% -5% (mass fraction). The method of addition can be to dissolve the monomer during polymerization and then polymerize, or blend after polymerization. The former is more effective. www.handern.com Breathable membrane equipment
(2) The stabilization of DC copolymers by PVDC heat stabilizers shows that the acid-absorbing heat stabilizers are known as: a alkaline earth or heavy metal oxides or weak acid salts, such as barium, cadmium or aluminum fatty acid salt b ring Oxides, such as epoxy soybean oil, epoxy esters and ethers, organic tin compounds, such as organic sulfur tin www.handern.com breathable membrane equipment
Light stabilizers, commercially available are hydrated acid series, m-dihydroxybenzoic acid series, benzophenone series, benzotriazole series, examples of used dienoic acid are maleic anhydride and aluminum dibasic maleate . www.handern.com Breathable membrane equipment
3) Antioxidants usually have two types: phosphites, EDA, citric acid and esters that terminate free-radical chain reaction and reduce peroxide, can be chelated with metals. In order to achieve the best stability effect, they are commonly used in practical applications Compound stabilizer to achieve the purpose of stability and synergy. He esters can be integrated with metals. In order to achieve the best stabilizing effect, compound stabilizers are commonly used in practical applications to achieve the purpose of stability and synergy.
www.handern.com Breathable membrane design
(4) Vinylidene chloride-acrylate copolymers without plasticizer films generally have poor thermal stability when extruded and plasticized. Plasticizers need to be added, but barrier properties are reduced. Japan Asahi Kasei Industries Co. Combined with extrusion molding conditions, the thermal stability is improved, plasticizer-free films can be processed, and composite properties with excellent properties can be obtained.
204. PVDC blown film variety specifications-CPVDC blown film has the following main types:
1) Good cooking performance. M, imYi0 bottle screen www.handern.com breathable film equipment
2) Good adhesion to the substrate. 3) Good separation from the substrate. www.handern.com Breathable membrane equipment
Generally speaking, the gas permeation phenomenon is composed of the dissolution of gas molecules → diffusion-desorption process, the molecular part causes the phenomenon of dissolution and diffusion, PVDC is a crystalline polymer, the crystal part is 30% -45%, part is 55% to 70%, the non-crystalline part has high electronegative chlorine atom content and tight molecular structure, so the gas solubility is low and the diffusion rate is slow, so the PVDC gas permeability is low. In addition, the molecular structure of PVDC does not have permanently polar groups. Unlike PA and PVA resins with hydrophilic groups, moisture does not affect gas permeability at all. It is composed of vinylidene chloride and vinyl chloride or alkyl acrylic acid. The copolymer of the copolymer is poor in thermal stability. The best volume of plasticizer and thermal stabilizer, but the addition of plasticizer, the barrier property is reduced, so it should be added less, and even the development of www.handern .com breathable membrane equipment
(1) Plasticizers for PVDC Due to the difficulty of processing PVDC, plasticizers need to be added. There are three types of plasticizers that can be used, namely adipic acid esters, including dibutyl ester and dioctyl ester; b decane Acid esters, including dibutyl ester and dioctyl ester; c citrate esters, including acetyl trioctyl, acetyl tributyl ester. These plasticizers can act alone or in combination, www.handern.com breathable membrane equipment
The used amount is 0.5% -10% (mass fraction) of the total monomer amount. Below this usage level, it is difficult to remove residual monomers, resulting in processing difficulties. Above the above usage level, monomers are easily removed and processability is improved, but the gas barrier properties of the product are reduced. In order to remove monomers while maintaining high gas For barrier property, the amount of plasticizer is preferably 1.0% -5% (mass fraction). The method of addition can be to dissolve the monomer during polymerization and then polymerize, or blend after polymerization. The former is more effective. www.handern.com Breathable membrane equipment
(2) The stabilization of DC copolymers by PVDC heat stabilizers shows that the acid-absorbing heat stabilizers are known as: a alkaline earth or heavy metal oxides or weak acid salts, such as barium, cadmium or aluminum fatty acid salt b ring Oxides, such as epoxy soybean oil, epoxy esters and ethers, organic tin compounds, such as organic sulfur tin www.handern.com breathable membrane equipment
Light stabilizers, commercially available are hydrated acid series, m-dihydroxybenzoic acid series, benzophenone series, benzotriazole series, examples of used dienoic acid are maleic anhydride and aluminum dibasic maleate . www.handern.com Breathable membrane equipment
3) Antioxidants usually have two types: phosphites, EDA, citric acid and esters that terminate free-radical chain reaction and reduce peroxide, can be chelated with metals. In order to achieve the best stability effect, they are commonly used in practical applications Compound stabilizer to achieve the purpose of stability and synergy. He esters can be integrated with metals. In order to achieve the best stabilizing effect, compound stabilizers are commonly used in practical applications to achieve the purpose of stability and synergy.
www.handern.com Breathable membrane design
(4) Vinylidene chloride-acrylate copolymers without plasticizer films generally have poor thermal stability when extruded and plasticized. Plasticizers need to be added, but barrier properties are reduced. Japan Asahi Kasei Industries Co. Combined with extrusion molding conditions, the thermal stability is improved, plasticizer-free films can be processed, and composite properties with excellent properties can be obtained.
204. PVDC blown film variety specifications-CPVDC blown film has the following main types:
1) Good cooking performance. M, imYi0 bottle screen www.handern.com breathable film equipment
2) Good adhesion to the substrate. 3) Good separation from the substrate. www.handern.com Breathable membrane equipment
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