With the continuous improvement of material development, today, various utensils and materials have appeared in life, and they are composed of different materials to meet everyone's needs and uses to the greatest extent.
For example, PVC hose pipe, although it is very common in our daily life, is not well known. In fact, it is applied to various fields and industries. Let me explain the relevant knowledge of PVC hose pipe in detail below.
The color of these products is very bright, strong and durable. At the same time, because auxiliary materials such as plasticizers and anti-aging agents are added in the production process, their heat resistance, toughness, and ductility are very good. However, due to these items It is toxic, so it is generally not stored in food and medicine.
PVC pipes are inseparable products in our lives. There are many types of PVC hoses. Among them, products using powdered nitrile rubber include PVC high-pressure air pipes, high-pressure oxygen pipes, household/industrial gas hoses, liquefied gas pipes, Gas pipes, high-pressure PVC agricultural spray pipes, high-pressure diving pipes, colored soft high-pressure gas hoses, high-temperature automobile oil pipes, and fire hoses, etc.
How can it be called a high-quality PVC hose pipe, its requirements must meet at least these basic properties: high pressure resistance, aging resistance, wear resistance, softness and toughness, drag resistance, vibration resistance, cold resistance, corrosion resistance, acid and alkali resistance, resistance Combustion, the product does not soften when heated, light and durable, etc.
However, the PVC hose pipes produced by most manufacturers cannot meet these basic properties at all, but various problems will occur, such as the oven can not withstand high temperature and burst, and the oven tensile test is not enough. Of course, in addition to the production process, temperature control, extrusion out speed, etc.
What is more important is to select good and right raw materials. The main material for producing PVC hoses is polyvinyl chloride (PVC) resin. PVC itself has an inelastic and flexible chain structure, so its low temperature resistance is poor.
As an elastomer, powdered nitrile rubber has a high degree of compatibility with PVC, and forms an "island" structure when blended with PVC. This uniform mixing system can effectively improve the flexibility of PVC, and its low temperature resistance can be effectively improved.
Due to its fine particles, dispersion and good fluidity, the soft points of rubber particles and elastomers are evenly distributed in the mixed material, thereby reducing the wear and tear of the PVC hose.
The use of powdered nitrile rubber is also of great help to the durability of the plasticizer. Most of the plasticizers used in soft PVC are low-molecular-weight substances, and the products are prone to oil injection, spray box, and squeegee during use. The problem is that adding PNBR can increase the resilience of the product, reduce the amount of plasticizer used, and at the same time reduce the migration speed of plasticizer due to the attraction of plasticizer.
1. When choosing, first judge the quality of the product by looking at its appearance. Generally speaking, if the appearance is shiny and there is no bubble impurities, it means that the pipe is basically qualified.
At the same time, you can also try the hand feel. As a hose, the bendability of the PVC hose pipe must be tested. Therefore, when purchasing, you may wish to touch it with your hand to see if it is smooth and whether it can be easily bent.
2. Hardness is also an important criterion for measuring whether the product is of high quality. When purchasing, you can drop the sample to the ground to see if it is easy to crack. If it is cracked, it is not recommended to buy it. If not, you can step on it again to see if it will be Step on it, if you are trampled to the ground, you don't have to buy it.
3. If the product you buy needs to be used outdoors, then its heat resistance is one of the key factors. When purchasing, you can use a lighter to burn it at a certain distance below the PVC hose. If the hose is quickly blackened If it is melted or melted, then do not buy it, and also check whether the product has a certificate of conformity, so that the quality is guaranteed.