Production method of environment-friendly formaldehyde-free plywood glue
A production method and technology for plywood, which are applied in the directions of aldehyde/ketone condensation polymer adhesives, adhesives, adhesive types, etc., can solve problems such as lack of production capacity, achieve low production cost, ensure environmental protection, and simple process reasonable effect
Active Publication Date: 2013-09-18
广东始兴县华洲木业有限公司
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Problems solved by technology
At present, most small and medium-sized enterprises in China do not have such production capacity.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0022] Select raw material formaldehyde and urea, their molar ratio is 1:1.02, weigh 17285kg of formaldehyde, 12750kg of urea, 135kg of additives, 300kg of modifiers, 400kg of melamine, 120kg of polyvinyl alcohol, put 17285kg of formaldehyde into the reaction kettle, add polymerization Vinyl alcohol 120kg, react for 10 minutes, stir and add alkali to adjust the pH value to 8.5-9.0; add 4750kg of urea to the reactor for the first time, add modifier 150kg, turn on the steam to heat up to 90°C, turn off the steam and keep it warm for 60 minutes Finally, measure the pH value between 6.5 and 7.0; after the holding time is up, adjust the pH value to 6.0, adjust the pH value to 5.1 to 5.3 after 30 minutes, add 250 kg of melamine, and measure the viscosity of the solution after 90 to 100 minutes; When the viscosity of the solution reaches 3000mPa·s, add 70kg of additives, then 250kg of melamine, and 4050kg of urea for the second time; when the viscosity of the solution reaches 5000mPa·...
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Abstract
The invention relates to a production method of environment-friendly formaldehyde-free plywood glue, which comprises the following steps: respectively weighing formaldehyde and urea in a mol ratio of 1:1.1-1:1.02, and adding urea for the first time; after finishing keeping the temperature, adding urea for the second time; when the solution viscosity reaches 5000mPa.s, adding urea for the third time, and carrying out vacuum dehydration for more than 120 minutes; after finishing dehydration, adding urea for the fourth time; and after carrying out dissolution reaction for 30 minutes, cooling to 38-42 DEG C, regulating the pH value to 7.8-8.5, and discharging the glue, thereby obtaining the environment-friendly formaldehyde-free plywood glue product. The proportional and fractional addition of urea and the low mol ratio ensure the environment friendliness of the glue; the invention has the advantages of simple and reasonable technique, low manufacturing cost, no gelation or tank spraying in the production process, and high production safety and stability; the storage period of the glue is more than 90 days; the glue can be stored, used and transported in both hot summer and cold winter; and the formaldehyde release of the artificial board produced from the environment-friendly E0-Grade glue product is E0<=3mg / 100g.
Description
technical field [0001] The invention belongs to the technical field of environment-friendly polymer new materials, and relates to a production method of environment-friendly formaldehyde-free plywood glue. Background technique [0002] Since January 1, 2002, my country has implemented the mandatory standard of "Indoor decoration materials, formaldehyde release limits in wood-based panels and their products", which puts forward new requirements for the formaldehyde release of wood-based panels. [0003] At present, in the world, according to the level of formaldehyde emission, it is divided into three levels: E2, E1, and E0, that is, E2≤30mg / 100g, E1≤9mg / 100g, E0≤3mg / 100g, and E0 level means that every 100g sample contains The amount of formaldehyde is less than or equal to 3mg, which is generally measured by the drilling method. At present, only Finland and Japan implement similar E0 standards in the world. Household products that meet this standard are international top env...
Claims
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IPC IPC(8): C08G12/40C09J161/32
Inventor 林卫东
Owner 广东始兴县华洲木业有限公司