Heat stabilizer Anti-aging performance
The anti-aging properties of PVC stabilizers are expressed through the anti-aging properties of PVC profiles.
The anti-aging performance of PVC stabilizers in PVC profiles is manifested in two aspects, on the one hand, to ensure the thermal stability of the PVC molecular chain during thermal mixing and processing, and on the other hand, to ensure the thermal stability of the PVC molecular chain during the use of PVC profiles. To achieve these two aspects, the anti-aging performance of the stabilizer itself is particularly important. If the anti-aging performance of the PVC stabilizer is not good, the resulting color-changing molecules will cause the decomposition of the PVC molecular chain, which will not only prevent the decomposition of the PVC resin, but will accelerate the aging rate of the PVC resin. Therefore, evaluating the anti-aging performance of the PVC stabilizer itself is an important prerequisite for ensuring the anti-aging performance of the PVC profile.
The evaluation content of the stabilizer: itself should have good thermal stability, light stability, in the thermal processing, preservation and use of the process does not change color, not colored. Here, we can also take the following four test methods to evaluate the anti-aging properties of the stabilizer: 1, PVC stabilizer itself outdoor sunlight; 2, PVC dry mix static thermal stability time; 3, PVC dry mix outdoor sunlight; 4, PVC profile artificial light aging irradiation test.
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16
2024.04
The importance of environmental awareness in PVC products
It is undeniable that Western industrial countries have formulated regulations and promulgated these policies because they are technically mature and economically affordable. The market share pursued by Chinese companies is the public use and use value of products. Therefore, they have failed to deal with the development and application of alternative products, which has led to the further increase in environmental protection pressure and the serious deterioration of the export situation. Today, most companies are helpless, production and operation are in trouble. Therefore, when we once again regard the above-mentioned environmental protection laws and regulations, laws and the current use of stabilizers in China, our auxiliary production and plastic products processing industry should have long-term effective planning, reduce or give up the production and use of lead and cadmium heavy metal stabilizers, and use more mature and environmentally friendly stabilizers instead.
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16
2024.04
Study on Stabilizing Mechanism of Organotin Heat Stabilizer
Sulfur-containing organotin stabilizers are mainly mercaptan organotin and organotin sulfides, which are currently more common stabilizers, but their odor is large, toxic and environmentally unfriendly. Monoalkyltin thiols and dialkyltin thiols are often used in combination to improve the initial colorability and long-term stability of PVC. It can be used for the stabilization of all polymers, with complete crystal-like transparency, and all organotin PVC stabilizers can do this through appropriate formulations.
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16
2024.04
Plastic pipe extrusion molding process parameters
Temperature is one of the important conditions for the smooth progress of extrusion molding. Starting from powdery or granular solid materials, high-temperature products are extruded from the head and undergo a complex temperature change process. Strictly speaking, the extrusion molding temperature should refer to the temperature of the plastic melt, but the temperature depends to a large extent on the temperature of the barrel and the screw, and a small part comes from the frictional heat generated when mixing in the barrel, so the barrel temperature is often used to approximate the molding temperature.
Since the temperature of the barrel and the plastic is different in each section of the screw, in order to make the process of conveying, melting, homogenizing and extruding the plastic in the barrel smoothly, so as to produce high-quality parts, the key problem is to control the temperature of each section of the barrel, and the adjustment of the barrel temperature is realized by the heating and cooling system and the temperature control system of the extruder.
The temperature of the head must be controlled below the thermal decomposition temperature of the plastic, and the temperature of the die can be slightly lower than the temperature of the head, but the plastic melt should be guaranteed to have good fluidity.
In addition, the temperature fluctuation and temperature difference in the molding process will cause the plastic parts to produce residual stress, uneven strength of each point and the surface is gray and dull. There are many factors that produce this fluctuation and temperature difference, such as unstable heating and cooling systems, changes in screw speed, etc., but the quality of screw design and selection is affected.
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28
2022.07
Information Publicity of Hazardous Waste in 2023
The wastewater produced by the company is first pre-treated by the company's three-effect condensation evaporation equipment, and after reaching the receiving standard of Longquan Water, it is transported to Longquan Water for further treatment by pipeline. After reaching the direct discharge standard, Longquan Water Affairs will discharge it according to relevant regulations and standards.
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10
2022.01
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Sales Hotline:0572-2216650
Service Hotline:0563-6988883
Company Website:http://www.xatchem.cn
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