1. Polyurethane composition and spraying characteristics
Polyurethane spraying is a polymer made of isocyanate and polyether as the main raw materials. It is mixed with special equipment and foamed on-site through high-pressure spraying with the help of various additives such as foaming agents, catalysts, and flame retardants. polymer. It has the function of waterproofing and insulating water, and has the characteristics of low thermal conductivity and high flame retardant level. Polyurethane spraying has the lowest thermal conductivity among all current insulation materials (the national standard of polyurethane is ≤0.024W/(m².k)).
The composition of black and white materials:
Black material is commonly known as polyurethane black material. It is a mixture containing a certain amount of isocyanate with higher functionality and diphenylmethane diisocyanate (MDI). It is used in the production of polyurethane foam. Rigid polyurethane foam is all polymerized MDI. White material is a mixture of white viscous liquid, which is composed of polyether polyol, catalyst, foaming agent, flame retardant and other raw materials (combined polyether polyol). Together with polymerized MDI, it is called white material.
2. Authentic polyurethane and vicious price competition
As we all know, the polyurethane thermal insulation and flame retardant grades in our refrigeration industry include: B1, B2, and B3 levels. B1 level is the highest flame retardant level, followed by B2 and B3 levels. Some companies’ polyurethane materials can only reach the flammable B2 level and the flammable B3 level. However, in order to gain market share, they do not hesitate to use B3 materials to pass off as B2 levels, and use B2 levels to pass off as B1 level materials for sale on the market.
On the other hand, there is vicious price competition. This year, the bidding price for B1-grade polyurethane in a certain area has been as low as 1,400 yuan per cubic meter. However, there is vicious price competition on the market that uses cutting corners to lower prices by 1,100 yuan to 1,200 yuan per cubic meter. .
So how do we identify the authenticity of B1 grade polyurethane materials? In this regard, we interviewed Manager Liu of Zhengzhou Xinlian Technology Company. All materials that claim to meet the national standard for flame retardant B1 level have relevant test reports.
At the same time, he also introduced that Zhengzhou Xinlian has more than ten years of experience in producing raw liquid polyurethane insulation materials. Compared with the materials of some manufacturers on the market, they have significant advantages:
1. Raw materials are purchased through multi-party screening to select the most stable and high-quality raw materials, and the formula is also based on stability. The finished product (combined polyether) spray coating goes through multiple testing experiments before leaving the factory. It will only leave the factory after passing the test completely to avoid like Some products on the market have quality problems such as raw material deterioration, foam shrinkage, cracking, heartburn, and low yield rate after leaving the factory.
2. We have extremely high requirements for the flame retardant properties of foam. The flame retardant properties of our spray paint for products of the same level are higher than those of many manufacturers on the market.
3. For consumers, while all indicators meet national standards, they also hope that the cost (high export rate) will be low. The yield rate of our products is 1-2m³/ton higher than that of many similar products on the market.
Comparison of flame retardant test between Zhengzhou Xinlian B2 and ordinary B2
Not only that, Zhengzhou Xinlian has an annual production capacity of 10,000 tons of polyurethane. It is a well-known company with a reputation in the polyurethane industry. Cold storage insulation materials have the characteristics of low thermal conductivity, high compressive strength, and high flame retardant grade. The company dispatches first-level anti-corrosion personnel to serve customers, and the material manufacturer provides third-party guarantees to eliminate worries.
