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Selection of raw material for adhesives
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There are many kinds of adhesives, so the raw materials of synthetic adhesives are also very much, in the synthesis of adhesive, the selection of raw materials is also very important, if not handled properly, will affect the adhesive effect, so the choice of adhesive raw materials in the end is what kind of?
(1) to meet the requirements of the process, the content or purity of the raw material must be guaranteed, and the industrial grade products shall be selected as much as possible so that the polymerization reaction and the curing of the adhesive can be carried out normally. If impurities or moisture are excessive, the performance of the product will be affected.
(2) consider the source of origin of raw material, also have an impact on the performance of adhesive products, with cyclohexane, petroleum cracking obtained contains straight chain hydrocarbon, high purity is not enough; and the content of hydrogenation of benzene to cyclohexane. Petroleum toluene and tar toluene show no difference in performance, while petroleum toluene has a much smaller odor than tar and toluene. The same light Magnesium Oxide, some of the same quality, large volume, high activity, while others are the opposite. If using this low activity light Magnesium Oxide and resin pre - reaction, it is inevitable to cause delamination and precipitation of chloroprene adhesive. The Formaldehyde Solution produced by different manufacturers produces l07 gum under the same conditions. The result is that there are some big viscosity and some viscosity is small.
(3) pay attention to storage period, chemical raw materials generally have storage period, long storage time of raw material performance will change, especially olefinic monomer and unsaturated bond rubber is more sensitive. It is better to use newly produced raw materials in case there is any trouble. Be careful to use raw material that is close to or exceed storage period, be sure to be careful, should make small test first, make sure again usable or not. |
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