\nOn the aspect of environmental protection materials, the guidance catalogue of national industrial structure adjustment in 2011 clearly pointed out that the production and application of rigid polyurethane foam instead of HCFCs -141b (HCFC-141b) should be encouraged.
\nIn 2014, HCFC-141b, the main foaming material of polyurethane, was granted a quota license for the first time. At the same time, the Ministry of environmental protection has also started the elimination of fluorine-containing foaming agents.
\nThen, the new regulations were issued. From January 1, 2019, except for the cold storage board industry, other ozone depleting industries could not use 141b, and the product was reduced by 30% per year in the cold storage board industry.
\nProfessionals in the chemical industry pointed out that \u201cusing cyclopentane instead of HCFC-141b as foaming agent has undoubtedly become a mainstream scheme, and we expect 141b to be eliminated in less than three years.\u201d
\nSimilarly, many manufacturers use n-pentane as polyurethane foaming agent, which makes the foaming more uniform and the process more advantageous. Moreover, pentane has high safety requirements, and few enterprises can pass the safety assessment. These manufacturers spent 2 or 3 million on pentane technology reserve and based on environmental protection. With the support of the government, they passed safety assessment and environmental protection and based on environmental protection.
\nExperts in the field of foam blowing agents, David Zhang, Sales Manager of Junyuan Petroleum Group, also agreed: \u201cat present, the best alternative is Pentane. Pentane must transform the foaming equipment, including foaming machine (gun head) and foaming fixture (heating system) The transformation of, intermediate tank, pre mixing system and storage tank needs to increase the ventilation and anti-static devices in the workshop, and the plant must use uninterruptible power supply, which will increase the burden of enterprises. \u201d
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