Preparation method of controlled-release type urea formaldehyde foamed plastic deacidification agent
A technology of urea-formaldehyde foam plastics and acid scavenger, which is applied in the preparation of microspheres and microcapsule preparations, and can solve problems such as foam cracking, large gaps between foam and cement, and delamination
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example 1
[0022] On 100kg of perlite (water content less than 2%) particles with an average particle size of 50μm, continuously spray a total weight of 100kg of sodium hydroxide solution (5%) until the solution is completely absorbed into the micropores; dry to remove the remaining water, so that the water content of perlite is less than 5%; spray 5kg polyvinyl alcohol aqueous solution (10%) to the surface of dehydrated perlite, and ensure that almost every particle surface is wrapped by liquid film; while stirring 200kg borax aqueous solution (0.1%), put in the processed perlite particles for gelation reaction to form capsules; finally, the encapsulated carrier is filtered and separated, and the slow-release type can be obtained when the water content is less than 7% after drying Acid remover.
example 2
[0024] On 100kg of diatomite (water content less than 4%) particles with an average particle size of 5mm, continuously spray a total weight of 100kg of sodium bicarbonate solution (5%) until the solution is completely absorbed into the micropores; dry and remove The remaining water makes the water content of the diatomite less than 5%; spray 5kg of sodium alginate aqueous solution (2%) on the surface of the dehydrated diatomite, and ensure that almost every particle surface is wrapped by a liquid film; while stirring 200kg of calcium chloride aqueous solution (0.1%) is put into the treated diatomite particles to form capsules for gelation reaction; finally, the encapsulated carrier is filtered and separated, and when dried to a water content of less than 7% A slow-release acid scavenger can be obtained.
example 3
[0026] On 100kg of perlite (water content less than 4%) particles with an average particle size of 1mm, continuously spray a total weight of 100kg of sodium hydroxide solution (5%) until the solution is completely absorbed into the micropores; dry to remove the remaining water, so that the water content of perlite is less than 5%; spray 5kg of guar gum aqueous solution (0.5%) to the surface of dehydrated perlite, and ensure that almost every particle surface is wrapped by liquid film; while stirring 200kg of heavy chromium Potassium acid aqueous solution (0.05%), while putting in the processed perlite particles to form capsules through gelation reaction; finally, the encapsulated carrier is filtered and separated, and can be obtained when the water content is less than 6% after drying. Slow-release acid scavenger.
[0027] The sustained-release effects of the acid scavenger prepared by the above three methods are shown in Table 1.
[0028] Table 1 Comparison of the slow-relea...
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