The Function of PVC Foaming Regulator (ACR530 PVC Foaming Regulator) in PVC Foaming Panel
PVC Foaming regulator, is the methyl acrylic acid ester and acrylic ester raw materials via special copolymer prepared by emulsion polymerization process, can also be called ACR or Foaming regulator.
For foaming adjusting-agent, viscosity is an important indicator, it represents the high and low molecular weight of foaming adjusting-agent, in order to adapt to the demand of PVC product market "calcium" (calcium powder added in large amount of foaming product), viscosity from the initial <10.0, to 10.0-11.0, until the present >=12.0. After market feedback Hengshui Homart Technology Co.,Ltd thick foaming board with foaming regulator viscosity even reached 13.0 above, stable performance, relatively small dosage.
Downstream of the current situation, industry competition intensifies, many clients in order to improve the price competitive advantage, especially the foaming wood plastic products, often added in the foaming PVC formulations using a large number of small pipe material, plastic materials, such as secondary materials can greatly speed up the whole of the plasticizing plasticizing, so in order to obtain good foaming effect, we suggest appropriate lower the temperature in the cylinder 1, 2 area, Or use a slowly plasticizing melt strength of the foaming regulator. This can not only make the foaming effect better, but also save part of the foaming agent, PVC foaming products will be better quality. Of course, choosing the right manufacturer is also a priority.
The detailed role of PVC foaming regulator is introduced below:
1. Characteristics of foaming regulator:
In PVC foaming products, the purpose of adding ultra-high molecular weight polymer: one is to promote PVC plasticization; Two is in order to improve the melt strength of PVC foaming materials, prevent the merger of bubbles, in order to get uniform foaming products; Three is to ensure that the melt has good fluidity, in order to get good appearance of products. Since DIFFERENT FOAMING PRODUCTS manufacturers have different products, the equipment, technology, raw materials and lubrication system used are different, so we have developed foaming regulators with different properties to meet the different needs of users.
2. Classification of foaming sheet material
According to the different foaming rate, can be divided into high foaming and low foaming, according to the soft and hard degree of bubble constitution, can be divided into hard, semi-hard, soft foam. According to the bubble structure can be divided into closed cell foam and open cell foam. Generally common PVC foam sheet material belongs to hard closed low foam sheet material.
3. The application of PVC foam sheet material
PVC foam sheet material has the advantages of chemical corrosion resistance, weather resistance, flame retardant and so on. It is widely used in many aspects, including display panel, mark, billboard, partition, building board, furniture board and so on.
4. The key factors to evaluate the quality of foaming sheet
For foamed material, the size and uniformity of the foam hole are the key factors affecting the quality of the sheet. For low foaming sheet material, the bubble hole is small and uniform, and the foaming sheet material has good toughness, high strength and good surface quality. From the aspect of reducing the density of foam sheet, only the small and uniform bubble hole can further reduce the possibility of density, and it is difficult to further reduce the density when the bubble is large and scattered.
5. Key points of PVC foaming process control
Plastic foaming is divided into three processes: formation of bubble core, expansion of bubble core and solidification of bubble body. For PVC foam sheet with chemical foaming agent added, the expansion of bubble core has a decisive impact on the quality of foam sheet. PVC belongs to the straight chain molecule, the molecular chain is short, the melt strength is low, in the bubble core expansion into the bubble process, the melt is not enough to cover the bubble, the gas is easy to overflow and merge into a bubble, reduce the product quality of the foam sheet.
The key factor to improve the quality of PVC foam sheet is to improve the melt strength of PVC. From the analysis of polymer material processing characteristics, there are many ways to improve the strength of PVC melt, but the most effective way is to add additives to improve the strength of the melt and reduce the processing temperature. PVC is an amorphous material, the melt strength decreases with the increase of melt temperature, on the contrary, the melt strength increases with the decrease of melt temperature, but the cooling effect is limited and only plays an auxiliary role. ACR processing agents have the effect of improving melt strength, and foaming regulator is the most effective. The melt strength increased with the increase of foaming regulator content. Generally speaking, as long as the screw has enough dispersive mixing ability, the effect of adding high viscosity foaming regulator to improve the melt strength is more obvious.
6 processing additives in PVC foam sheet material
ACR processing additives can promote the melting of PVC, improve the surface finish, improve the elasticity of melt, and enhance the elongation and strength of melt. It is helpful to cover the bubble and prevent the collapse of the bubble hole. The molecular weight and dosage of foaming regulator have a great influence on the density of foaming sheet: with the increase of molecular weight, PVC melt strength, the density of foaming sheet can be lower, and improve the dosage of regulator has the same effect. However, this effect is not linear. Increasing the molecular weight or increasing the dosage will not significantly reduce the density, and the density will tend to be constant.
Important relationship between foam regulator and foaming agent, the density of foamed sheet with foaming regulator is a balance point, in this balance, density of foamed sheet is not affected by the influence of foaming agent content, are held constant, is also increase dosage of foaming agent can't reduce the density, the cause of this phenomenon is under a certain amount of foam regulator dosage, The melt strength of PVC is limited, and excess gas causes bubble holes to collapse or merge.
Choose the correct and most appropriate foaming regulator can be the best quality of foaming board, Hengshui Homart Technology Co., Ltd company's ACR530 PVC Foaming Regulator Processing Aid and CM - 90 PVC Processing Aid Foaming Regulator is suitable for foaming board and WPC board and other different products, our company in the PVC auxiliary industry has 22 years of production experience and accumulated rich technical experience, the service of many manufacturers of foaming board customers, stable quality and excellent
The Function of PVC Foaming Regulator (ACR530 PVC Foaming Regulator) in PVC plastic Foaming Panel
2022 10/22