To ensure the measurement accuracy of the components, the polyol raw material is generally at 25 ~ 50 ° C constant temperature metering, transport, some chain extender, auxiliary blowing agents and other components at lower temperatures Yi crystallization, or easy to produce at a higher temperature vaporization, which shall take appropriate measures to control the temperature. Since the amount of complexing agent of many small and metering cylinder volume is measured implemented, to reduce measurement error should be considered density of each raw ingredients, measuring cylinder should be thin and long appropriate. In the case of a conditional, a plurality of tubular injection piston metering device can be used. Of course, for small business combination compounder, simple method can also be used to turn raw materials weighed added. But no matter what way was added in combination compounder in the process, we must pay attention to the following questions.
(1) Material mixing efficiency is high. Under normal circumstances, the stirring speed should be greater than 80r / min, mixing time should be greater than 1.5h.
(2) in a variety of ingredients, the non-foaming agent is added first, or because it is poor compatibility with other components, and is easy to form hydrogen bonds polyol is a polyol surrounded by the formation of more gum, so that the deviation of the blowing agent formulation.
(3) each metering component must be accurate.
(4) a combination of compounder reactor should have a larger volume, to reduce fluctuations in the quality of finished batches of material combinations. The combination of foreign professional material production plant, and equipment in addition to high-precision measurement devices, which are generally mixed reactor volume in 10㎥ above.
(5) In order to ensure product quality and combination of materials, raw materials and production base to deal with the material combination of rigorous analysis of test material. Not only on the product of the combination of materials to make the hydroxyl value, carboxymethyl value, moisture and viscosity and other indicators to meet the product specifications, must also have good storage stability. In the storage process, with no stratification. In the selection of raw materials on the basis of, shall meet the performance requirements on the basis of a reasonable, preferences chemical stability, good solubility, hydrolysis, low volatility with the agent to ensure that the combination of materials product has excellent storage stability sex. For individual must be added, but prone to decomposition, or with other components is easy to produce chemical reactions, seriously affecting the storage stability of the material composition of chemicals, such as organic tin-based catalyst and other small chemicals, if necessary, temporarily Portfolio material component, and rescheduled prior to use.
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Phone: 86-0577-65336533
Fax: 86-577-65336599
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E-mail: lxpu4008268887@sina.com
QQ: 2088530984
Address: Ruian international automobile and motorcycle industry park Luoshan Road on the 8th
Official Taobao: http: //shop122069384.taobao.com/
Official microblogging: http: //weibo.com/lxpu
Micro-channel public service number: lxpuwx
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Address：Ryan international automobile and motorcycle industry park Luoshan Road on the 8th phone：400-826-8887 Contact: Chen Phone：13515871991
Address：Ryan international automobile and motorcycle industry park Luoshan Road on the 8th phone：400-826-8887 Contact: Chen Phone：13515871991