Neutral obturator phenolic aldehyde foam plastic and preparation method thereof

Abstract

The invention discloses neutral obturator phenolic aldehyde foam plastic and a preparation method thereof and relates to phenolic aldehyde foam plastic. The invention provides the neutral obturator phenolic aldehyde foam plastic and the preparation method thereof. The neutral obturator phenolic aldehyde foam plastic is neutral on the premise of no influencing properties, such as heat insulation, fire resistance and the like, of the phenolic aldehyde foam plastic and is modified by alkaline sustained-release microcapsules. The neutral obturator phenolic aldehyde foam plastic consists of the following raw materials in part by mass: 100 parts of expandable phenolic resin, 3 to 5 parts of surfactant, 3 to 15 parts of foaming agent, 5 to 40 parts of alkaline sustained-release microcapsule and 3 to 30 parts of acid curing agent. The preparation method comprises the following steps: mixing the expandable phenolic resin, the surfactant, the alkaline sustained-release microcapsule and the hydrocarbon foaming agent; adding the acid curing agent; conveying the mixture to a base plane which can move continuously and is paved with a surface layer material; and preparing the neutral obturator phenolic aldehyde foam plastic with the required shapes by using the heated double-caterpillar type laminating machine conveying machine unit. The obtained neutral obturator phenolic aldehyde foam plastic is modified by the alkaline sustained-release microcapsules.

Description

technical field [0001] The invention relates to a phenolic foamed plastic, in particular to a neutral closed-cell phenolic foamed plastic modified with alkaline slow-release microcapsules and a preparation method thereof. Background technique [0002] In recent years, phenolic foam has received more and more attention due to its advantages of heat resistance and heat insulation, flame retardant and self-extinguishing, flame penetration resistance, low toxicity and low smoke, no dripping during combustion and carbonization, and wide operating temperature range. Its application fields is also expanding. However, a problem that cannot be ignored in phenolic foam products is that because the curing agents used are organic or inorganic acids, phenolic foams are generally medium-strong acidic, and the pH value is between 1 and 5. It will cause strong corrosion to the surface layer material compounded on the phenolic foam plastic, especially the metal surface layer material, which...

AI Technical Summary

Problems solved by technology

However, a problem that cannot be ignored in phenolic foam products is that because the curing agents used are organic or inorganic acids, phenolic foams are generally medium-strong acidic, and the pH value is between 1 and 5. It will cause strong corrosion to the surface layer material compounded on the phenolic foam plastic, especially the metal surface layer material, which greatly reduces the service life of the phenolic foam plastic product, thus limiting the application of the phenolic foam plastic product.

Previously, there were reports of directly using alkaline blowing agents (sodium carbonate, sodium bicarbonate, magnesium carbonate, etc.) to prepare neutral phenolic foam plastics. The chemical reaction of the non-toxic foaming agent causes the resin mixture to foam and solidify before it is evenly stirred, and the foaming process is difficult to control