Heat curing low-temperature type welding line sealant and preparing method thereof

Abstract

The invention discloses heat curing low-temperature type welding line sealant. The sealant comprises, by mass, 20-35% of PVC resin, 20-35% of filler, 20-35% of plasticizer, 2-5% of dispersing agent, 1-15% of tackifier, 2-10% of hygroscopic agent and 1-5% of stabilizer. A preparing method of the sealant comprises the steps that firstly, powder is added in the plasticizer accounting for 80+ / -5% of the total adding mass of the plasticizer and evenly stirred till no particle exists, the residual 20+ / -5% of plasticizer is added in batch, the dispersing agent is added in batch after even stirring, and stirring is carried out under the vacuum state; secondly, placement is carried out to enable a product to be cured; thirdly, the viscosity of the product is adjusted after curing; fourthly, the heat curing low-temperature type welding line sealant is obtained through filtering of a filtering net. The welding line sealant is mainly used for welding line sealing between an inner plate connecting portion and an outer plate connecting portion of an automobile, and large improvement is achieved on adhesiveness, shearing strength and tensile strength of the sealant. The requirements for reducing drying channels and reducing the temperature can be met, the production efficiency of customers is improved, and the cost of energy consumption is reduced.

Description

technical field [0001] The invention relates to a weld seam sealant, in particular to a thermosetting low-temperature weld seam sealant acting between the connection part of an automobile inner panel and the connection part of an outer panel and a preparation method thereof. Background technique [0002] Generally speaking, the joints of the inner and outer plates of most automobile steel plates are coated with weld sealant to play the role of waterproof, anti-rust and noise reduction. The hardening reaction is completed after pre-drying→intermediate coating→finish paint oven baking. [0003] The original weld sealant is pre-dried → mid-coat → topcoat in three ovens. Each oven takes 30 minutes and the temperature is 140°C. The baking time is long and the efficiency is low. If the product needs to be baked once to harden and to achieve the above-mentioned three-baked effect, it needs to be baked at a temperature of 170°C for 30 minutes, which is a waste of energy and require...

AI Technical Summary

Problems solved by technology

[0003] The original weld sealant is pre-dried → mid-coat → topcoat in three ovens, each oven takes 30 minutes and the temperature is 140°C, the baking time is long and the efficiency is low

If the product needs to be baked once to harden and to achieve the effect of the above three times of baking, it needs to be baked at a temperature of 170°C for 30 minutes, which is a waste of energy, and the requirements for the drying tunnel equipment are correspondingly increased

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