Method for making open-cell paraffin for polyurethane foam caulk

Abstract

The invention discloses a method for producing tapping paraffin serving as polyurethane foam crack filler.The method comprises the following steps of adding heavy liquid wax into a reaction kettle; introducing chlorine into the reaction kettle, and controlling the reaction temperature; after the heavy liquid wax reacts with the chlorine for a while, detecting the density of chlorinated paraffin, and then blowing off hydrogen chloride gas; after the hydrogen chloride gas is blown off, detecting the acid value, and then adding compound heat stabilizer, so that the tapping paraffin is obtained.The method for producing the tapping paraffin has the advantages that the temperature of the reaction conducted between the heavy liquid wax and chlorine and the introducing amount of chlorine are controlled, so that low-carbon-chain constituents maintain low chlorine content, high-carbon-chain constituents have high chlorine content, chlorine elements are uniformly distributed on the heavy liquid wax, the distribution mode is beneficial to foam hole balance of the polyurethane foam crack filler, in addition, foam holes can emerge to be of a netted structure, and untoward effects such as enlarged foam holes and messy foam cannot be caused.

Description

technical field [0001] The invention relates to a production method of a plasticizer, in particular to a production method of open-cell paraffin used for 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 high-temperature and high-humidity environment, it will accelerate its drying speed, resulting in an increase in the closed cell rate of the polyurethane foam and a decrease in air permeability. Shrinkage, affecting the continued stability of polyurethane foam caulks. [0003] In general, people add excessive polymethylene polyphe...

AI Technical Summary

Problems solved by technology

However, in a high-temperature and high-humidity environment, it will accelerate its drying speed, resulting in an increase in the closed cell rate of the polyurethane foam and a decrease in air permeability. Shrinkage, which affects the continued stability of polyurethane foam caulks

[0003] In general, people add excessive polymethylene polyphenyl isocyanate to the polyurethane foam caulking agent to slow down the complete drying speed of the polyurethane foam caulking agent under high temperature and high humidity conditions to increase the polyurethane foam caulking agent. open cell ratio and air permeability; or add more expensive open cell silicone oil to the polyurethane foam sealant, but after adding the open cell silicone oil, the open cell rate and air permeability of the polyurethane foam filler are increased, but at the same time But it will reduce the compression resistance of the polyurethane foam filler. In addition, because the open-cell silicone oil is relatively expensive, the price of the product will not be well controlled