Silicone acrylic emulsion modified magnesium-containing inorganic adhesive for straws and preparation method of silicone acrylic emulsion modified magnesium-containing inorganic adhesive

Abstract

The invention discloses a silicon acrylic emulsion modified magnesium-containing inorganic adhesive for straws. The adhesive is prepared from, by weight, 100 parts of magnesium chloride hexahydrate, 44-61 parts of magnesium sulfate heptahydrate, 218-298 parts of light calcined magnesia, 167-202 parts of water, 10-43 parts of silicone acrylic emulsion and 4-9 parts of dispersant. Adhered products prepared with the adhesive are high in water resistance, strength and toughness and appropriate in coagulation rate. The invention further discloses a preparation method of the silicone acrylic emulsion modified magnesium-containing inorganic adhesive. The method includes steps: feeding water into a reaction kettle, heating, adding the magnesium chloride hexahydrate, and stirring at a constant speed to obtain a magnesium chloride solution; slowly adding the magnesium sulfate heptahydrate into the magnesium chloride solution, and stirring at a constant speed; adding the light calcined magnesia into the reaction kettle, and stirring at a constant speed; slowing dripping the silicone acrylic emulsion into the reaction kettle, adding the dispersant after dripping is finished, stirring and cooling to obtain the adhesive.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to a silicon-acrylic emulsion-modified magnesium-based inorganic adhesive used for producing environmentally friendly, moisture-resistant, flame-retardant, and high-strength crop straw wood-based panels and a preparation method thereof. Background technique [0002] Magnesium-based inorganic adhesive is a new type of adhesive in the wood adhesive industry. It is environmentally friendly, low in price, high and low temperature resistance, high wear resistance, good air stability and weather resistance, and can also be well combined with Straw scraps are bonded to produce fireproof straw boards with good processing properties, which have been widely used in the fields of construction, decoration, packaging and other materials. However, the condensation speed of the magnesium-based inorganic adhesive is fast, so that the reaction heat of the magnesium-based inorganic adhe...

AI Technical Summary

Problems solved by technology

However, the condensation speed of the magnesium-based inorganic adhesive is fast, so that the reaction heat of the magnesium-based inorganic adhesive is too concentrated during the hardening process, and the strength phase cannot be formed well, resulting in warping and deformation of the straw board, lower strength, and higher brittleness. Large; and poor water resistance, it is easy to absorb moisture in the air and cause brine flooding, which seriously affects the decorative quality and use effect of cemented products, reduces the strength of cemented products, and shortens the service life of cemented products. Especially in high humidity areas

Although the use of silica fume, phosphoric acid, sulfate, urea-formaldehyde resin, etc. can improve one or several defects of magnesium-based inorganic adhesives, the effect is not satisfactory.

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