Joint glue for corner part of sealing strip for car door and preparation method

Abstract

The invention discloses joint glue for a corner part of a sealing strip for a car door and a preparation method. The joint glue adopts the technical scheme that the joint glue is prepared by the following materials in parts by mass: 100-160 parts of ethylene propylene diene terpolymer rubber K4869, 20-50 parts of ethylene propylene diene terpolymer rubber 4045M, 3-8 parts of zinc oxide, 1-3 parts of stearic acid, 1-3 parts of dispersant L-24, 2-5 parts of polyethylene glycol, 60-100 parts of FEF (Fast Extruding Furnace) level carbon black N550, 20-80 parts of light calcium carbonate, 40-70 parts of paraffin oil, 3-8 parts of moisture absorbent, 0.1-0.5 parts of anti-scorching agent, 0.8-1.6 parts of sulfur and 1.7-4.7 parts of accelerant. The mooney viscosity of the joint glue is increased to be 16; the tensile strength is improved to be 12.3MPa; a shearing force during mixing is increased obviously; the dispersity of a packing is improved; skidding during the mixing of the glue is precluded; and the production efficiency is improved.

Description

technical field [0001] The invention relates to a rubber product, in particular to a joint rubber material used at the corner of an automobile door sealing strip and a preparation method thereof. Background technique [0002] Automobile door seals are mainly used in gaps that need to be sealed, such as doors, windows, hatch covers, etc., in addition to playing a sealing role to prevent harmful substances such as wind and sand, rain, and dust from intruding into the interior and exterior of the car, and can also play a role in shock absorption, insulation Acoustic and decorative functions to improve the working life of auto parts and the comfort of the car. Due to the differences in the structure of different parts of the automobile body sheet metal, the cross-sectional structure materials of different parts of the automobile sealing strip are variable, especially the movable and fixed parts of the car doors and windows, as well as different parts such as corners, bends and s...

AI Technical Summary

Problems solved by technology

In order to ensure the cushioning effect and closing force when the car door is closed, the hardness of the rubber material needs to be controlled between 35 and 40 degrees. Paraffin oil will lead to low strength and poor physical and mechanical properties of the rubber compound; and slippage will occur due to the addition of a large amount of paraffin oil during mixing, which will prolong the mixing process time to 10 minutes; The shear stress is reduced, the filler particles are difficult to disperse, which affects the dispersion of the rubber compound and the low pressure in the mold cavity during molding and vulcanization, making it difficult to discharge the gas, affecting the compactness of the product, and defects such as nest gas.