CO2 cured alkaline phenolic resin and preparation method thereof
The invention aims to provide a CO2 cured alkaline phenolic resin and a preparation method thereof. The CO2 cured alkaline phenolic resin is characterized by being prepared from the following components in parts by weight: 150-200 parts of phenol compounds, 250-300 parts of aldehyde compounds, 30-50 parts of a modifier, 300-400 parts of 50% aqueous alkali, 50-70 parts of a hardening accelerating agent and 3-5 parts of a silane coupling agent. Compared with viscosity of 150mPa.s at the temperature of more than 25 DEG C of the CO2 cured alkaline phenolic resin in the prior art, the viscosity of the CO2 cured alkaline phenolic resin provided by the invention is reduced below 100mPa.s at the temperature of 25 DEG C. In addition, the CO2 cured alkaline phenolic resin can ensure that the strength of resin-bonded sand is high and the use performance is improved and can greatly facilitate the operation of sanding mixing during modeling and core making. 1. A CO2 hardening alkaline phenolic resin, characterized in that the stated CO2 hardening alkaline phenolic resin comprised of the following components according to weight proportion: 2. CO2 hardening alkaline phenolic resin according to Claim 1, characterized in that the phenolic compound is selected from phenol, cresol, xylenol, m-cresol, bisphenol A, resorcinol one kind or two kinds in mixture of two or more. 3. CO2 hardening alkaline phenolic resin according to Claim 1, characterized in that the compound is selected from the aldehyde such as formaldehyde, paraformaldehyde, acetaldehyde, glyoxal, furfural one or two or more than two types of mixture, wherein the formaldehyde is the concentration of 37%-40% of the aqueous solution. 4. CO2 hardening alkaline phenolic resin according to Claim 1, characterized in that said modifying agent is selected from the group consisting of furfuryl alcohol, three weth, benzyl alcohol, phenylpropanol, 3-heptanol, glycol, sorbitol, xylitol, mannitol of one or two or more than two types of mixture, modifier and alkali must at the same time take part in the reaction. 5. CO2 hardening alkaline phenolic resin according to Claim 1, characterized in that the alkali is selected from potassium hydroxide, sodium hydroxide, lithium hydroxide or a mixture of two or more. 6. CO2 hardening alkaline phenolic resin according to Claim 1, characterized in that the mixtures of selected from borax or calcium hydroxide in one kind or two kinds of mixture. 7. CO2 hardening alkaline phenolic resin according to Claim 1, characterized in that said silane coupling agent is selected from γ-aminopropyl triethoxy silane, γ-(2, 3) epoxy (propoxy) propyl trimethoxysilane, γ-methacryloyl propyl trimethoxy silane, N-(β aminoethyl)-γ-amino propyl methyl dimethoxy silane of one kind or two kinds of mixture. 8. A CO2 hardening alkaline phenolic resin preparation method according to Claim 1, characterized in that the preparation method comprises the following steps: 1) the phenol compounds, aldehyde compounds total quality and 5%-10% of 50% in an aqueous alkali solution added in a reaction kettle, with less than 1 the temperature [...] /min to the speed of the 65 [...] , thermal insulation 30-60 minutes; 2) adding modifier and total quality 20%-25% of the 50% alkali aqueous solution, to rise to the 100 [...] , thermal insulation 45 to 90 minutes; 3) to -0.06 MPa--0.08 MPa distillation under pressure; 4) adding the remaining 50% alkali aqueous solution; 5) lowering the temperature to 60 the following [...] , adding mixtures, uniform stirring; 6) lowering the temperature to the 40 the following [...] , add silane coupling agent, uniform mixing, discharging. 9. In accordance with claim 8 said CO2 hardening alkaline phenolic resin preparation method, characterized in that the content of the compound states the phenol apperception 99.0% or more, the content of the aldehyde compounds to 37%-40%.