UPR is mainly used in the manufacture of FRP, artificial marble, etc. At the second meeting of the 15th General Assembly of the Unsaturated Polyester Resin Branch of the China Synthetic Resin Supply and Marketing Association held recently, the delegates believed that the UPR production company only had a good green account. , play a good green card, in order to have room for survival and development.
Control the addition of toxic solvents
It is understood that some unsaturated resin manufacturers add profits such as dichloroethane, chloroform, dimethyl carbonate, toluene, xylene, methanol, ethanol, etc. to the unsaturated resin produced and sold in order to reduce costs. Solvent, or a mixture of other modified compounds. These solvents do not participate in the cross-linking reaction of the resin. In the production process of FRP and other products as solvent monomers, most of them volatilize into the operating environment and the atmosphere, greatly increasing VOCs. The emissions, causing human health hazards and environmental pollution. Many companies are forced to follow the market competition pressure, resulting in price confusion of UPR resin, disorderly competition.
For the healthy development of the industry, in May 2017, the China Unsaturated Polyester Resin Branch of the Synthetic Resin Supply and Marketing Association issued the “China's Unsaturated Polyester Resin Industry bans the addition of a toxic and harmful solvent self-discipline Convention that cannot crosslink chemical reactions”. Resin producers in the field of composite materials, artificial stone industry, and related raw and auxiliary materials production and sales companies, which are committed to producing, using and selling unsaturated polyester resins (including vinyl ester resins) in the company. Do not add toxic and harmful solvents that cannot crosslink chemical reactions, and partially replace styrene crosslinkers.
Qi Jiye, Secretary-General of the Unsaturated Polyester Resin Branch of the China Synthetic Resin Supply and Marketing Association, told reporters that after one year of the self-discipline convention, 85 of the 220 resin companies in the country joined, and most of the companies adhered to the promise, but some of the companies that joined did not. Compliance with commitments.
Qi Jiye said: 'The self-discipline convention only allows the conscience enterprises to actively abide by the moral level, but it is not a law and has no mandatory effect. At present, the association has also begun to formulate solvent addition standards, hoping to control the addition of toxic and harmful solvents from the regulations, and purify Market. '
Realize green production process
At present, some UPR manufacturers are actively seeking changes, and accelerate the green transformation of enterprises through the application of green environmental protection processes and intelligent upgrades.
Fu Ruowen, consultant of Zhaoqing Futian Chemical Industry Co., Ltd. believes that the green development of UPR products is first of all the greening of the production process. Futian Chemical adheres to the business philosophy of safety, energy conservation and environmental protection while investing in technology, and invests 30 million yuan to establish a sewage treatment system. Adopting Germany's advanced biochemical treatment system and MBR (membrane bioreactor) process, all the production sewage and domestic sewage in the plant have been treated, and all the indicators have reached the national first-class discharge standard; more than 8 million yuan was invested in the pipeline. The exhaust gas of the whole plant is collected, and the regenerative high-temperature oxidation furnace treatment system is used to oxidize and decompose the VOCs in the exhaust gas; the online VOCs monitoring system is introduced to monitor the exhaust gas in real time.
Intelligentization is a new way to achieve green production. Shandong Kaiwell New Materials Co., Ltd. 200,000 tons / year high-performance UPR device is the first in China to equip intelligent production systems. They make full use of current pre-diagnostic technology to help improve operations. The self-control rate of the whole device reaches 98%, the production process control does not require personnel operation, the production efficiency is greatly improved, and the batch stability of product quality is also improved.
According to reports, all the waste generated, and VOCs using the company's TO (direct combustion) + RTO (Regenerative combustion) manner, all of the heat energy generated for the winter heating and insulation lines, pollutant emissions at or below the particular value .
Inhibit the volatilization
It is understood that styrene is the most abundant raw material in UPR synthesis, but in the process of molding the product, it will volatilize a lot, resulting in a large smell in the production workshop, seriously polluting the environment and endangering the health of workers. Europe and other places have already issued relevant regulations and restrictions. The concentration of styrene gas in the production workshop. With the continuous upgrading of China's environmental protection requirements, effectively inhibiting the volatilization of styrene, has become the development direction of the UPR industry.
According to Wang Xiaodong, deputy general manager of Huachang Polymer Co., Ltd., East China University of Science and Technology, at present, it is possible to reduce the volatilization of styrene by 50% by adding a film-forming additive that inhibits the volatilization of styrene, which does not have much influence on the curing performance of the resin. The process performance of the resin in the application. It is also possible to synthesize UPR with low styrene content, replace styrene with other low volatility active monomers, and UPR with low styrene content can reduce the volatilization of styrene by more than 60%.
For example, Wang Xiaodong said that when vinyl ester polyester resin is used, when using low styrene volatile resin, 1 ton of product can save 1,250 yuan, which not only reduces production cost, but also reduces the amount of styrene volatilization in the resin system, effectively improving The operating environment at the production site guarantees the health of workers, and its performance and curing performance are basically the same as those of styrene resin.