Preparation method of setting paraffin for polyurethane foam caulk

Abstract

The invention discloses a method for producing shaping paraffin serving as polyurethane foam crack filler.The method comprises the following steps of adding heavy liquid wax and light liquid wax into a reaction kettle, and stirring the materials to be uniform, so that reaction materials are obtained; introducing chlorine into the reaction kettle, and controlling the reaction temperature; after the reaction materials react with the chlorine for a while, detecting the density and viscosity of chlorinated paraffin, and then blowing off hydrogen chloride gas; then detecting the acid value, and then adding compound heat stabilizer, so that the shaping paraffin is obtained.The method has the advantages that the produced shaping paraffin is high in chlorine content, as a result of increase of the chlorine content, the viscosity of the polyurethane foam crack filler can be increased accordingly, and thereby the phenomena that when the polyurethane foam crack filler is used under the condition of low temperature and low humidity, the completely dry speed is low, obtained foam is low in viscosity and thus cannot support a framework of the foaming volume, obtained foam is made to flow out and cannot expand in a space where gluing is predicted to be conducted are avoided.

Description

technical field [0001] The invention relates to a preparation method of a sizing agent, in particular to a preparation method of a sizing paraffin used in a polyurethane foam caulking agent. Background technique [0002] Polyurethane foam caulk is a one-component, moisture-curing, multi-purpose polyurethane foam-filled elastic sealing material. Its cured foam elastomer has excellent properties such as bonding, waterproof, thermal expansion and contraction resistance, heat insulation, sound insulation, etc., and is widely used in filling and sealing of side seams of building doors and windows, expansion joints of components and holes. However, in a low temperature and low humidity environment, it will affect its drying speed, causing the foam to collapse again. When construction is performed in a low temperature and low humidity environment, the polyurethane foam sealant will be placed in the gap between the door frame or window frame due to the temperature of the air. The l...

AI Technical Summary

Problems solved by technology

However, in a low temperature and low humidity environment, it will affect its drying speed, causing the foam to collapse again. When construction is performed in a low temperature and low humidity environment, the polyurethane foam sealant will be placed in the gap between the door frame or window frame due to the temperature of the air. The low humidity slows down the drying speed, causing the polyurethane foam to flow down and cannot expand in the expected glued space, which affects the foaming effect of the polyurethane foam sealant

[0003] In general, polyurethane foam sealants mainly use polyether polyol and polymethylene polyphenyl isocyanate to react with catalysts to adjust the setting effect of the foam, but in low-grade polyurethane foam sealants, polyether polyol and poly The content of methylene polyphenyl isocyanate is relatively low. Due to its relatively low content, the skeleton that can support the foaming volume is reduced, and chlorinated paraffin is a low-cost PVC plastic plasticizer, which is the only one in the field of polyurethane The use of polyurethane foam caulking agent, after 2008, polyurethane foam caulking agent manufacturers added a large amount of chlorinated paraffin to polyurethane foam caulking agent in order to control the cost, but the formulated formula used conventional 52# with low viscosity Chlorinated paraffin, so the amount of polyether polyol and multi-polyurethane foam sealant in polyurethane foam sealant can not be greatly reduced, which makes the production cost of polyurethane foam sealant can not be greatly reduced