New developped PVC extrusion profile for power socket rail
others
PVC/ACR blending modification
by：CSSSLD
2021-02-03
Judge PVC plasticizing degree method has the following: 1.
To observe the condition of material: from extruder vent with macroscopic observation machine the material inside the cylinder, if material evenly coated in the spiral groove surface, and no uneven phenomenon, can be seen as good plasticizing.
2.
Watch products injection molding processing surface: surface luster, no dark, no bump, cavity inside and outside the wall smooth feel to good plasticizing.
3.
Stretching method: when the plasticizing degree is low or high, low elongation at break.
A high degree of plasticizing was 70%, the elongation at break.
When the profiles elongation at break 140%
150% when the plasticizing degree of its products is good, good low temperature impact performance.
4.
Solvent method: under the condition of 15 ℃ for 15 min, without the plasticization of PVC resin can be dissolved by the methylene chloride, and low degree of plasticizing PVC profiles, because did not form a three-dimensional network structure, crystallization solvent molecules can penetrate into the network chain segment, make the products surface has floc, can appear the phenomenon such as surface loose.
And plasticizing of zero, only swelling, no delaminating and cracking phenomenon.
core-shell particles can be evenly dispersed in PVC matrix, and PVC phase effect, promote the plasticization of PVC and gelation, has the very good processing performance. Plasticizing time is short, forming small temperature influence on the notched impact strength, bending modulus drop less, welding performance and aging resistance performance is good. ACR join there is a side effect, can make the tensile strength and hardness of hard PVC and the heat resistance decreased, should be pay attention to in the production practice.
because ACR and PVC with good intermiscibility, the particles can fill the gap and spread to PVC multiple particle, island structure formation, in the process of blending produce larger inner friction, promote PVC multiple particle breakage and melting, can shorten plasticizing time. To promote the effect of gelation, molecular weight of the ACR products has distinct effect on the performance. Small molecular weight, good for promote gelation and plasticizing, but affects the impact strength of PVC; Molecular weight is too big, and the ACR molten decomposition is difficult, for the promotion of PVC gelation, plasticizing capacity is reduced. So as a processing modifier ACR, its molecular weight in the 30 - It is advisable to 600000, then both the ideal and promote gelation effect, and shall not affect the impact resistance of PVC products. At the same time due to the plasticizing effect is good, make injection molding products processing uniformity is improved.
the addition of ACR will cause swelling effect - Barus effect, that is, the melt in the machining process, once the pressure relief, it shows that is stronger than the ordinary PVC melt rebound phenomenon. He joined increases with an increase in the number of as. Time effect may be due to the height between ACR and PVC molecular entanglement, relaxation has slowed.
in type insect-resistant ACR, he is a kind of copolymer with core-shell structure, its nucleus is c bean acid ester elastomer, shell for methyl methacrylate, consistent with the solubility parameters of PVC, both can be completely dissolved. As a stress concentration centre, in force, easy to induce large amounts of silver lines or shear section, consume large amounts of energy, improve the blending of PVC/ACR system shock resistance.
as a rigid PVC resin modifier, impact modifiers for AVR can be divided into processing aid and type two kinds big. ACR processing aid dosage forms are the main varieties of methyl acrylic acid - Ethyl acrylate copolymer emulsion method, in the hard PVC plastic injection products processing formula to add a small amount of this kind of ACR, can make the material gelation is accelerated, plasticizing time in advance, and increase the melt viscosity.
in some cases, excessive barus effect will have an unfavorable influence on the processing of material, but on the other hand. Appropriate this effect but also has advantages. Melt from the die swell, logistics fan rather than smooth bar into the cavity, piled up against the cold, hot material, reduce the cold spot and silver lines; On the other hand, the viscosity of PVC/ACR blend is larger, caused by the shear heat near the mouth fever, makes the melt viscosity declined, make the material can be smoothly into the cavity. Can eliminate the edge cracks, burrs and spot mark, improve the quality of products.
more excellent articles: rigid PVC modifier, click directly.
http://www。 csssld。 cn//html/2016/Trade_0924/351。 HTML
nantong on suye's official website: http://www. csssld。 cn//
core-shell particles can be evenly dispersed in PVC matrix, and PVC phase effect, promote the plasticization of PVC and gelation, has the very good processing performance. Plasticizing time is short, forming small temperature influence on the notched impact strength, bending modulus drop less, welding performance and aging resistance performance is good. ACR join there is a side effect, can make the tensile strength and hardness of hard PVC and the heat resistance decreased, should be pay attention to in the production practice.
because ACR and PVC with good intermiscibility, the particles can fill the gap and spread to PVC multiple particle, island structure formation, in the process of blending produce larger inner friction, promote PVC multiple particle breakage and melting, can shorten plasticizing time. To promote the effect of gelation, molecular weight of the ACR products has distinct effect on the performance. Small molecular weight, good for promote gelation and plasticizing, but affects the impact strength of PVC; Molecular weight is too big, and the ACR molten decomposition is difficult, for the promotion of PVC gelation, plasticizing capacity is reduced. So as a processing modifier ACR, its molecular weight in the 30 - It is advisable to 600000, then both the ideal and promote gelation effect, and shall not affect the impact resistance of PVC products. At the same time due to the plasticizing effect is good, make injection molding products processing uniformity is improved.
the addition of ACR will cause swelling effect - Barus effect, that is, the melt in the machining process, once the pressure relief, it shows that is stronger than the ordinary PVC melt rebound phenomenon. He joined increases with an increase in the number of as. Time effect may be due to the height between ACR and PVC molecular entanglement, relaxation has slowed.
in type insect-resistant ACR, he is a kind of copolymer with core-shell structure, its nucleus is c bean acid ester elastomer, shell for methyl methacrylate, consistent with the solubility parameters of PVC, both can be completely dissolved. As a stress concentration centre, in force, easy to induce large amounts of silver lines or shear section, consume large amounts of energy, improve the blending of PVC/ACR system shock resistance.
as a rigid PVC resin modifier, impact modifiers for AVR can be divided into processing aid and type two kinds big. ACR processing aid dosage forms are the main varieties of methyl acrylic acid - Ethyl acrylate copolymer emulsion method, in the hard PVC plastic injection products processing formula to add a small amount of this kind of ACR, can make the material gelation is accelerated, plasticizing time in advance, and increase the melt viscosity.
in some cases, excessive barus effect will have an unfavorable influence on the processing of material, but on the other hand. Appropriate this effect but also has advantages. Melt from the die swell, logistics fan rather than smooth bar into the cavity, piled up against the cold, hot material, reduce the cold spot and silver lines; On the other hand, the viscosity of PVC/ACR blend is larger, caused by the shear heat near the mouth fever, makes the melt viscosity declined, make the material can be smoothly into the cavity. Can eliminate the edge cracks, burrs and spot mark, improve the quality of products.
more excellent articles: rigid PVC modifier, click directly.
http://www。 csssld。 cn//html/2016/Trade_0924/351。 HTML
nantong on suye's official website: http://www. csssld。 cn//
Custom message
Related Products
