Auxiliary agents, also known as additives, are substances that are added to a material to improve or modify its properties. In the field of polymers, auxiliary agents are commonly used to enhance the processing, performance, and durability of polymer materials. Auxiliary Agent,Liquid Phenolic Resin,Phenolic Resin,Composite Phenolic Epoxy Resin Shanghai Shengduan Trading Co., Ltd. , https://www.shsdchem.com
There are several types of auxiliary agents, each with its own unique properties and applications. The most common type is processing aids, which are added to polymer materials to improve their flow and moldability during processing. Processing aids can improve the surface finish of the final product and reduce the amount of energy required during processing.
Another type of auxiliary agent is plasticizers, which are added to polymer materials to increase their flexibility and reduce their brittleness. Plasticizers can improve the toughness and impact resistance of the final product and are commonly used in the production of flexible PVC products, such as hoses and films.
Other types of auxiliary agents include stabilizers, which are added to polymer materials to protect them from degradation caused by heat, light, or chemical exposure. Stabilizers can improve the durability and longevity of the final product and are commonly used in outdoor applications, such as building materials and automotive parts.
Colorants, fillers, and flame retardants are also common types of auxiliary agents. Colorants are added to polymer materials to give them a specific color, while fillers are added to improve the mechanical properties of the final product, such as its strength and stiffness. Flame retardants are added to polymer materials to reduce the risk of fire and are commonly used in applications where fire safety is critical, such as building materials and electronics.
The choice of auxiliary agent depends on the specific application requirements and must be carefully considered to ensure that the final product meets the desired specifications. It is important to select the appropriate auxiliary agent to achieve the desired performance, processing, and durability characteristics of the polymer material.
In summary, auxiliary agents play an important role in the processing, performance, and durability of polymer materials. There are several types of auxiliary agents, each with its own unique properties and applications, and the choice of auxiliary agent depends on the specific application requirements.
Notes on selecting gas alarm
The selection of gas alarms is skillful. According to the characteristics of gas alarms, different detectors are needed in different fields and places. Let me talk about how to choose a gas alarm.
Because industrial alarms require quantitative measurements, catalytic combustion sensors and electrochemical sensors are mostly used. However, semiconductor sensors were also used in the early days, but now there are almost no manufacturers using semiconductor sensors because of higher requirements. Industrial gas alarms can be divided into point gas detectors and portable gas detectors in terms of usage. Taking into account the price factor, electrochemical sensors are generally only used in quantitative measurement of toxic gases. For explosion detection occasions, catalytic combustion sensors are generally used because of low requirements.
Notes on selecting gas alarm
1. Selection principle of detector explosion-proof type
1) For the catalytic combustion type tester, the flameproof type should be selected;
2) For electrochemical detectors and semiconductor detectors, flameproof type or intrinsically safe explosion-proof type can be selected;
3) Select the explosion-proof grade and group of the detector according to the type, level and group of the combustible gas detected;
4) Explosion-proof structure should be selected for electric suction sampler.
5) Select the explosion-proof type of the detector according to the division of the explosion-endangered area of ​​the use site;
2. The selection of gas alarms for combustible gas detectors shall meet the following requirements:
1) Catalytic combustion sensors should be used for gases that are inherently combustible.
2) When the air in the place of use contains a small amount of sulfur, phosphorus, arsenic, halogen compounds and other media that can poison the catalytic combustion detection element, the anti-toxic catalytic combustion detector or semiconductor detector should be selected;
3) For the detection of hydrogen, electrochemical sensors or conductor detectors should be used.
3. The selection of the toxic gas detector can be determined according to the specific characteristics of the toxic gas being detected:
1) Hydrogen sulfide and carbon monoxide gas can be used in fixed potential electrolysis type or semiconductor type;
2) lǜ gas can choose diaphragm electrode type, constant potential electrolysis type or semiconductor type
3) Ethylene oxide and acrylonitrile gas can be selected from semiconductor type or constant potential electrolysis type
4) QÃng hydrogen gas can be selected from gel electrolysis (battery type), diaphragm electrode type or constant potential electrolysis type;
5) Vinyl chloride gas should choose semiconductor type or photon ionization type.
4. The selection of toxic gas detectors should consider the cross influence of extremely toxic gases and other gases in the installation environment. 5. Determination of the sampling method of the detector
1) Diffusion detector should be used
2) In the following cases, single-point or multi-point inhalation detectors should be used a. Locations that may cause serious consequences due to a small amount of leakage; b. Locations where it is difficult to use diffusion detectors due to installation and environmental conditions; , Class â… (extremely hazardous) toxic gas release source; d. Locations where toxic gas release sources are concentrated.
3) When the inhalation toxic gas detector is used to detect flammable toxic gas, the pneumatic inhalation sampling system should be selected