In the process of PVC processing, 1% to 5% of processing aids of PVC resin should be added. ACR is the most widely used processing aid. It is used in the main processing methods of PVC such as extrusion, injection molding, blow molding, suction molding and calendering. has been widely used. Regarding the mechanism

Mixing personnel, work requirements ① All kinds of raw materials must be listed, orderly, clearly marked, and neatly stacked. ② Operate strictly according to the mixing procedure and discharge temperature. It is strictly forbidden to violate the procedure of feeding and discharging at low temperature or over temperature

Due to the asymmetric structure of plastic profiles and low thermal conductivity, heating and cooling are difficult. , the corresponding internal stress will inevitably be generated. Its internal stress has a great influence on the strength of the profile. Although it is impossible to completely eliminate it, it is still possible to reduce the effect

1. Insufficient melt strength will lead to large cells in the foam sheet and long longitudinal section bubbles. Judgment method: go to the back of the three rollers and press the sheet wrapped on the middle roller with your fingers, the melt strength is good and you can feel the elasticity when pressing. If it is difficult to bounce after

The principle of hot mixing technology Mixing can be divided into hot mixing and cold mixing parts. Hot mixing is by no means as most people understand it, it is just a simple mixing and stirring process of materials. Hot mixing is that different components and dosage materials in the formula, driven by high-speed rotating

01 The role of cold mixing and hot mixing equipment The working principles of cold mixing and hot mixing are different. Hot mixing is generally not equipped with external heating, mainly relying on high-speed rotating blade pulp to drive the material to collide with each other, friction and shear with the barrel, and generate

Physical properties 1) Relative density Among the commonly used white pigments, titanium dioxide has the smallest relative density. Among the white pigments of the same quality, titanium dioxide has the largest surface area and the highest pigment volume. 2) Melting point and boiling point Since the anatase type will transform

Iron oxide is an inorganic substance with the chemical formula Fe2O3, which is a red or dark red amorphous powder. The relative density is 5~5.25, and the melting point is 1565°C (decomposition at the same time). Insoluble in water, soluble in hydrochloric acid and sulfuric acid, slightly soluble in nitric acid. The hiding power

Brighteners are a class of organic compounds that can improve the whiteness of fabrics and paper. Also known as optical brightener, fluorescent whitening agent. Fabrics, etc. are often yellow due to the inclusion of colored impurities. In the past, chemical bleaching was used to decolorize them, and whitening agents were added

MBS additives are commonly known as MBS materials. As one of the most important impact modifiers for PVC, MBS material can maintain the transparency of PVC to the greatest extent while toughening, and at the same time, compared with other impact modifiers, under the same dosage It can greatly improve the toughness