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Formaldehyde-free building adhesive and preparation process thereof

A production process and construction adhesive technology, which is applied in formaldehyde-free construction adhesives and the production process belongs to the field of adhesives, which can solve the problems of difficult preparation and complex components, and achieve the effects of improved water resistance, increased molecular weight, and increased viscosity

Inactive Publication Date: 2011-04-06
GUANGZHOU NUOKANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example is Patent No. CN200510036482.7, a new type of formaldehyde-free environmentally friendly adhesive. Its preparation process is composed of polyvinyl alcohol, polyacrylamide, urea, water glass, aluminum sulfate, sodium fluorosilicate, bentonite, etc., and the composition is complex. difficult to prepare

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In a 1000 ml three-neck glass bottle, add 800 grams of water, preheat to 70-80 ℃ in a water bath, add 100 grams of polyvinyl alcohol (PVA-1799) under stirring, heat up to 90-95 ℃ to dissolve, wait for complete dissolution After penetrating, adjust the pH value of the glue solution to 3.5 with 10-30% hydrochloric acid, add cold water in a water bath to cool the glue solution to 80°C, add 25 g of 40% glyoxal, react for 1-3 hours, wait for glue After the liquid viscosity reaches 1500cp, neutralize the PH value to 8.0 with 20% aqueous sodium hydroxide solution, cool to below 50°C, add water to make the total solid content 10%, filter out the material, and measure the free formaldehyde (glyoxal) The content is less than 0.01%.

Embodiment 2

[0018] Add 800 liters of water to a 1000-liter enamel reaction kettle, preheat to 70-80 °C, add 100 kg of PVA-1799, heat up to 90-95 °C to dissolve, and after it is completely dissolved, cool down to 75 °C, add 20% of PVA-1799 Aqueous hydrochloric acid solution, adjust the pH value to 3.0, add 30 kg of 40% glyoxal, react at 70~80 ℃ for 3 hours, neutralize to pH 8.0 with 30% lye, cool to below 50 ℃, add water When the solid content reaches 10%, the material is filtered and discharged, and the content of free aldehyde (glyoxal) is 0.01%.

Embodiment 3

[0020] In a 1000 ml three-neck glass beaker, add 800 grams of water, preheat to 70-80 ℃ in a water bath, add 100 grams of polyvinyl alcohol (PVA-2499) under stirring, heat up to 90-95 ℃ to dissolve, wait for complete dissolution After penetration, add cold water in a water bath to cool down the glue to 80°C, adjust the pH of the glue to 2.5 with 30% hydrochloric acid, add 30 grams of 25% glutaraldehyde, and react for 1-3 hours. After reaching 1500cp, neutralize the PH value of the glue solution to 8.0 with 30% aqueous sodium hydroxide solution, cool to below 50°C, add water to make the total solid content 10%, filter and discharge.

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Abstract

The invention relates to a formaldehyde-free building adhesive and a preparation process thereof, and belongs to the field of adhesives. The adhesive comprises the following components by weight: 100g of polyvinyl alcohol (PVA) and 5 to 35g of dialdehyde, wherein the PVA has the polymerization degree of more than 1,700 and the hydrolysis degree of over 98 percent, and is one of PVA-1799, PVA-2099, PVA-2499 and PVA-2699. The molecular weight is improved, the viscosity is increased, adhesion to a base material is improved, the water resistance is improved, free formaldehyde does not exists, and the adhesive is nontoxic to environment and has certain bactericidal effect.

Description

technical field [0001] The formaldehyde-free construction adhesive and the production process of the invention belong to the field of adhesives, in particular to a formaldehyde-free construction adhesive for construction. Background technique [0002] Most of the existing construction glues are polyvinyl formal glues, which are polyvinyl acetal glues formed by cross-linking reaction of polyvinyl alcohol aqueous solution with formaldehyde in an acidic medium. Compared with the pure polyvinyl alcohol glue, the molecular weight of the polyvinyl acetal glue is increased, the adhesion to the substrate is improved, the water resistance is enhanced, and the low temperature stability is improved, but there is unreacted free formaldehyde. Formaldehyde has a low boiling point, is a gas at room temperature, and is easy to diffuse into the air. Formaldehyde is a carcinogen with a strong pungent odor and high toxicity. Therefore, the national standard strictly restricts the free formalde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J129/14
Inventor 周涛
Owner GUANGZHOU NUOKANG CHEM
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