Due to the following reaction between water molecules and MS sealant, doors and Windows sealant is consumed, so the moisture content will affect the molecular weight of doors and Windows sealant, and then affect the molecular weight of MS sealant. And finally affect the performance of cured SPUs. The molecular weight of water is 18, the molecular weight of MS sealant is 174, so per gram of water consumption 9.7 toluene II MS sealant. In order to study the effect of moisture content on molecular weight of butyl sealant for doors and Windows, polyols with different moisture content were used to react with the same amount of toluene II sealant, and the effect of moisture content on molecular weight of PU was determined by measuring the NCO content of butyl sealant.

         In this experiment, toluene butyl sealant and difunctional molecular weight X000 polyether as raw materials, design MS sealant NCO=2.0010, synthetic polyurethane vinegar prepolymer, test its NCO content, NCO content and raw material water content, raw material water content has a greater impact on the NCO content of butyl sealant.

The above pictures are provided by Auman environmental door and window sealant manufacturer

         The molecular weight of binary butyl sealant can be expressed as :MPu 100X84/NCO%. When the moisture content is SOOppm, the molecular weight of the design 4200 reaches 4940, so the effect of moisture on the molecular weight of MS sealant must be reduced or eliminated.

         Because the water molecules will consume butyl sealant, so in the synthetic end of MS sealant group butyl sealant MS sealant molecular size becomes larger, so that butyl sealant salary becomes larger.

         In addition, due to the generation of pulse formic acid cool will further crosslink with MS doors and Windows sealant to form a network structure, so that the Zhejiang butyl sealant widening.

         In order to study the influence of moisture content on the salary of Zhejiang butyl sealant, TDI and molecular weight 2000 binary polyether as raw materials, design doors and Windows butyl sealant NCO=2.0% determination of butyl sealant.

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