CN109438749A - A kind of hydrophobicity melamine formaldehyde resin foam plastics and preparation method thereof - Google Patents
A kind of hydrophobicity melamine formaldehyde resin foam plastics and preparation method thereof Download PDFInfo
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- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08G12/30—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with substituted triazines
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- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
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- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
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- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
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- C08J2203/12—Organic compounds only containing carbon, hydrogen and oxygen atoms, e.g. ketone or alcohol
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- C08J2203/00—Foams characterized by the expanding agent
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- C08J2361/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08J2361/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08J2361/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine
Abstract
The invention belongs to polymeric foam plastics arts, more particularly to a kind of hydrophobicity melamine formaldehyde resin foam plastics and preparation method thereof, it is made of following parts by weight: 30~40 parts of melamine, 20~30 parts of paraformaldehyde, 1~2 part of stabilizer, 15~25 parts of water, 4~7 parts of emulsifier, 2~4 parts of curing agent, 5~8 parts of foaming agent, 3~6 parts of blowing promotor, 5-20 parts of hydrophobing agent liquid；Present invention process is simple, at low cost, hydrophobicity is strong.
Description
Technical field
The invention belongs to polymeric foam plastics arts, and in particular to a kind of hydrophobicity melamine resin bubble
Foam plastics and preparation method thereof.
Background technique
Melamine foam is foamed under microwave-assisted by melamine resin, is a kind of percent opening
The novel foamed plastic of up to 99% or more three dimensional network structure, melamine foam as a kind of low-density, it is fire-retardant,
Sound-absorbing, heat preservation New Chemical Materials, the fields such as civilian, industrial, building, traffic, aviation, military affairs, daily use chemicals, electronic information have
There is highly important application value, is especially answered extensively in the case where thering is fire-retardant, high temperature, low frequency noise to absorb desired environmental condition
With being the irreplaceable Novel environment-friendlymaterial material of domestic new material circle.
Melamine foam may cause the increase of its density, insulation performance since percent opening is high, water absorption rate is high
Decline, heat-proof quality reduce, to limit it in the application of certain specific areas such as building, communications and transportation, electronics.
Chinese invention patent publication number CN104961908A discloses a kind of hydrophobicity melamine foamed plastic and its preparation side
Method, this method is by carrying out sprinkling dipping to foam again after reaction solution mixed foaming and foaming is added in hydrophober calcium stearate
The dual hydrophobic of calcium stearate solution is handled, and obtains hydrophobicity melamine foamed plastic, the porosity of the melamine foamed plastic is 80
~ 95%, the size of hole is distributed as 0.1 ~ 1mm, and 130 ~ 150 ° of angle of wetting, 10 ~ 20g of water absorption.But although this method reduces
The water absorption rate of melamine foamed plastic, but material hydrophobic performance is not strong, still has certain water imbibition.
Chinese invention patent publication number CN105949499A discloses a kind of preparation method of super hydrophobic material, this method benefit
Use SiO2、TiO2、CeO2Etc. nano materials melamine foam material entirety three-dimensional structure is modified, so that it is thick to improve it
Rugosity is wrapped up coarse structure using solution of silane, is modified, and the excellent super hydrophobic material of hydrophobic performance is prepared, this is super thin
The static contact angle of water material and water is 152-158 °, but the technical matters step is complicated, and higher cost is not easy to industry
Change, therefore the prior art needs further improve.
Summary of the invention
The purpose of the present invention is to provide a kind of simple processes, the hydrophobicity melamino-formaldehyde that at low cost, hydrophobicity is strong
Resin foam plastics and preparation method thereof.
Based on above-mentioned purpose, the present invention is adopted the following technical scheme that:
A kind of hydrophobicity melamine formaldehyde resin foam plastics, which is characterized in that be made of following parts by weight: melamine
30~40 parts, 20~30 parts of paraformaldehyde, 1~2 part of stabilizer, 15~25 parts of water, 4~7 parts of emulsifier, curing agent 2
~4 parts, 5~8 parts of foaming agent, 3~6 parts of blowing promotor, 5-20 parts of hydrophobing agent liquid.
Further, the stabilizer be inclined sodium sulphate, sodium thiosulfate, sodium peroxydisulfate, it is a kind of in sodium sulfite or
Two or more mixtures.
Further, the emulsifier is neopelex, alkyl phenol polyoxyethylene ether, fatty alcohol polyoxy second
Alkene ether, aliphatic acid polyethenoxy ether, mixture one or more kinds of in fatty acid methyl ester APEO.
Further, the curing agent be formic acid, acetic acid, oxalic acid, ammonium chloride, ammonium sulfate, p-methyl benzenesulfonic acid, hydrochloric acid,
The mixture of one or more of sulfuric acid, phosphoric acid.
Further, the foaming agent be pentane, it is isopentane, n-hexane, petroleum ether, a kind of in methylene chloride or two
Kind or more mixture.
Further, the blowing promotor is one or more of silicone oil, polyurethane, nona-fluoro butyl group ether
Mixture.
Further, the hydrophobicity melamine formaldehyde resin foam plastics, the 1L hydrophobing agent liquid is by following
Raw material composition: the mass ratio of hydrophobing agent, organic solvent and titanate esters, the hydrophobing agent, organic solvent and titanate esters is 1:
(0.1~3): (0.1~1).
Further, the hydrophobing agent is modified poly(silicon aether), polysilicon acid propyl ester, fluorination ethoxylate urethanes, 13
One or more kinds of mixture in fluoro-octane ethyl triethoxy silicane alkane, 17 fluorine decyl tripropoxy silane.
Further, the organic solvent is one of ethyl alcohol, isopropanol, n-butanol, atoleine, machine oil or two
Kind or more mixture；The titanate esters are compound phosphoric acid type monoalkoxy class titanate esters, monoalkoxy unsaturated fatty acid
One or more kinds of mixture in titanate esters, two (octyl phenol polyoxyethylene ether) phosphatide.
The preparation method of the hydrophobicity melamine formaldehyde resin foam plastics, comprises the steps of:
(1) by paraformaldehyde, stabilizer and water be added reactor in, add triethanolamine adjust pH value be 8~9, then plus
Enter melamine, at 80~95 DEG C, stirring to solution clear forms melamine prepolymer resin liquid；
(2) emulsifier, curing agent, foaming agent, blowing promotor are added into melamine prepolymer resin liquid to stir evenly and to be formed
Expanding foam solution and melamine prepolymer resin liquid are poured into mold by expanding foam solution after mixing, be then placed into micro-wave oven with
1000~5000W, foam 3~10min, forms foamed plastic, then foamed plastic is placed in baking oven, cures at 180~260 DEG C
1~2h；
(3) use ultrasonic wave with the power of 200-500W hydrophobing agent, organic solvent and titanate esters, ultrasonic 1-5min is made and dredges
Aqua liquid；
(4) hydrophobing agent liquid is evenly dispersed in by melamine formaldehyde resin foam plastics by dipping, coating or spray pattern
In, up to hydrophobicity melamine formaldehyde resin foam plastics after drying.
Technical effect of the invention are as follows:
1. steady using joined in the synthesis process of melamine resin prepolymer resin in preparation method of the invention
Determine agent and avoid the resin crosslinking curing brought by the factors such as pH value, temperature, stirring fluctuate in synthetic reaction process, simultaneously
The presence of stabilizer has the function of aoxidizing or restore to residual free formaldehyde, and it is free that melamine foam can be effectively reduced
Content of formaldehyde.
2. the present invention is added to blowing promotor in expanding foam solution, blowing promotor can effectively reduce melamine foam table
Face stomata quantity keeps the refinement of plastic foam three-dimensional fenestral fabric uniform, while improving the rebound degree and toughness of foamed plastics.
3. hydrophobing agent liquid used in the present invention is compounded by hydrophobing agent, organic solvent and titanate esters, hydrophobing agent has
Extremely low surface energy, titanate esters stable chemical performance, the two synergistic effect have melamine foam obtained relatively strong
Hydrophobicity, contact angle be greater than 150 °, and thermostabilization, wet stability can it is good, weatherability is strong.
4. present invention process is simple, cost is relatively low, easily operated, does not need special process equipment, obtained trimerization
Not only hydrophobic performance is good for cyanamide formaldehyde resin foam plastics, but also free formaldehyde content is low, mechanical property is good.
Specific embodiment
Embodiment 1:
A kind of hydrophobicity melamine formaldehyde resin foam plastics, are made of following parts by weight: 30 parts of melamine, poly
20 parts of formaldehyde, 1 part of stabilizer, 15 parts of water, 4 parts of emulsifier, 2 parts of curing agent, 5 parts of foaming agent, 3 parts of blowing promotor,
5 parts of hydrophobing agent liquid；
The stabilizer is inclined sodium sulphate；Emulsifier is neopelex；Curing agent is formic acid；Foaming agent is positive penta
Alkane；Blowing promotor is silicone oil.
The 1L hydrophobing agent liquid is made of following raw material: hydrophobing agent, organic solvent and titanate esters, the hydrophobing agent,
Organic solvent and the mass ratio of titanate esters are 1:0.1:0.1；Hydrophobing agent is modified poly(silicon aether)；Organic solvent is ethyl alcohol；Described
Titanate esters are compound phosphoric acid type monoalkoxy class titanate esters.
The preparation method of the hydrophobicity melamine formaldehyde resin foam plastics, comprises the steps of:
(1) paraformaldehyde, stabilizer and water are added in reactor, adding triethanolamine and adjusting pH value is 8, is then added three
Poly cyanamid, at 80 DEG C, stirring to solution clear forms melamine prepolymer resin liquid；
(2) emulsifier, curing agent, foaming agent, blowing promotor are added into melamine prepolymer resin liquid to stir evenly and to be formed
Expanding foam solution and melamine prepolymer resin liquid are poured into mold by expanding foam solution after mixing, be then placed into micro-wave oven with
1000W, foam 3min, forms foamed plastic, then foamed plastic is placed in baking oven, cures 1h at 180 DEG C；
(3) use ultrasonic wave with the power of 200W hydrophobing agent, organic solvent and titanate esters, hydrophobing agent liquid is made in ultrasonic 1min；
(4) hydrophobing agent liquid is evenly dispersed in by melamine formaldehyde resin foam plastics by dipping, coating or spray pattern
In, up to hydrophobicity melamine formaldehyde resin foam plastics after drying.
Embodiment 2:
A kind of hydrophobicity melamine formaldehyde resin foam plastics, are made of following parts by weight: 35 parts of melamine, poly first
25 parts of aldehyde, 1.5 parts of stabilizer, 20 parts of water, 5.5 parts of emulsifier, 3 parts of curing agent, 6 parts of foaming agent, 4 parts of blowing promotor,
12 parts of hydrophobing agent liquid；
The stabilizer is sodium thiosulfate；Emulsifier is alkyl phenol polyoxyethylene ether；Curing agent is acetic acid；Foaming agent is different
Pentane；The blowing promotor is polyurethane.
The 1L hydrophobing agent liquid is made of following raw material: hydrophobing agent, organic solvent and titanate esters, the hydrophobing agent,
Organic solvent and the mass ratio of titanate esters are 1:2:0.5.
The hydrophobing agent is polysilicon acid propyl ester；The organic solvent is isopropanol；The titanate esters are single alcoxyl
Base unsaturated fatty acid titanate esters.
The preparation method of the hydrophobicity melamine formaldehyde resin foam plastics, comprises the steps of:
(1) paraformaldehyde, stabilizer and water are added in reactor, adding triethanolamine and adjusting pH value is 8.5, is then added
Melamine, at 87 DEG C, stirring to solution clear forms melamine prepolymer resin liquid；
(2) emulsifier, curing agent, foaming agent, blowing promotor are added into melamine prepolymer resin liquid to stir evenly and to be formed
Expanding foam solution and melamine prepolymer resin liquid are poured into mold by expanding foam solution after mixing, be then placed into micro-wave oven with
3000W, foam 6min, forms foamed plastic, then foamed plastic is placed in baking oven, cures 1.5h at 220 DEG C；
(3) use ultrasonic wave with the power of 350W hydrophobing agent, organic solvent and titanate esters, hydrophobing agent liquid is made in ultrasonic 3min；
(4) hydrophobing agent liquid is evenly dispersed in by melamine formaldehyde resin foam plastics by dipping, coating or spray pattern
In, up to hydrophobicity melamine formaldehyde resin foam plastics after drying.
Embodiment 3:
A kind of hydrophobicity melamine formaldehyde resin foam plastics, are made of following parts by weight: 40 parts of melamine, poly
30 parts of formaldehyde, 2 parts of stabilizer, 25 parts of water, 7 parts of emulsifier, 4 parts of curing agent, 8 parts of foaming agent, 6 parts of blowing promotor,
20 parts of hydrophobing agent liquid；
The stabilizer is sodium peroxydisulfate；Emulsifier is fatty alcohol polyoxyethylene ether；Curing agent is oxalic acid；Foaming agent is positive oneself
Alkane；Blowing promotor is nona-fluoro butyl group ether；
The 1L hydrophobing agent liquid is made of following raw material: hydrophobing agent, organic solvent and titanate esters, the hydrophobing agent, organic
Solvent and the mass ratio of titanate esters are 1:3:1.
The hydrophobing agent is fluorination ethoxylate urethanes；Organic solvent is n-butanol；The titanate esters are two (pungent
Polyoxyethylene alkylphenol ether) phosphatide.
The preparation method of hydrophobicity melamine formaldehyde resin foam plastics, comprises the steps of:
(1) paraformaldehyde, stabilizer and water are added in reactor, adding triethanolamine and adjusting pH value is 9, is then added three
Poly cyanamid, at 95 DEG C, stirring to solution clear forms melamine prepolymer resin liquid；
(2) emulsifier, curing agent, foaming agent, blowing promotor are added into melamine prepolymer resin liquid to stir evenly and to be formed
Expanding foam solution and melamine prepolymer resin liquid are poured into mold by expanding foam solution after mixing, be then placed into micro-wave oven with
5000W, foam 10min, forms foamed plastic, then foamed plastic is placed in baking oven, cures 2h at 260 DEG C；
(3) use ultrasonic wave with the power of 500W hydrophobing agent, organic solvent and titanate esters, hydrophobing agent liquid is made in ultrasonic 5min；
(4) hydrophobing agent liquid is evenly dispersed in by melamine formaldehyde resin foam plastics by dipping, coating or spray pattern
In, up to hydrophobicity melamine formaldehyde resin foam plastics after drying.
Embodiment 4:
A kind of hydrophobicity melamine formaldehyde resin foam plastics, are made of following parts by weight: 38 parts of melamine, poly
28 parts of formaldehyde, 1.7 parts of stabilizer, 18 parts of water, 5 parts of emulsifier, 3 parts of curing agent, 7 parts of foaming agent, 5 parts of blowing promotor,
15 parts of hydrophobing agent liquid；
The stabilizer is sodium sulfite；Emulsifier is aliphatic acid polyethenoxy ether；Curing agent is ammonium chloride；Foaming agent is stone
Oily ether；The blowing promotor is silicone oil and polyurethane mixture.
The 1L hydrophobing agent liquid is made of following raw material: hydrophobing agent, organic solvent and titanate esters, the hydrophobing agent,
Organic solvent and the mass ratio of titanate esters are 1:1:0.5.
The hydrophobing agent is ten trifluoro octyl triethoxysilanes.Organic solvent is atoleine；The metatitanic acid
Ester is two (octyl phenol polyoxyethylene ether) phosphatide.
The preparation method of hydrophobicity melamine formaldehyde resin foam plastics, comprises the steps of:
(1) paraformaldehyde, stabilizer and water are added in reactor, adding triethanolamine and adjusting pH value is 8.7, is then added
Melamine, at 93 DEG C, stirring to solution clear forms melamine prepolymer resin liquid；
(2) emulsifier, curing agent, foaming agent, blowing promotor are added into melamine prepolymer resin liquid to stir evenly and to be formed
Expanding foam solution and melamine prepolymer resin liquid are poured into mold by expanding foam solution after mixing, be then placed into micro-wave oven with
2000W, foam 7min, forms foamed plastic, then foamed plastic is placed in baking oven, cures 1.3h at 200 DEG C；
(3) use ultrasonic wave with the power of 300W hydrophobing agent, organic solvent and titanate esters, hydrophobing agent liquid is made in ultrasonic 2min；
(4) hydrophobing agent liquid is evenly dispersed in by melamine formaldehyde resin foam plastics by dipping, coating or spray pattern
In, up to hydrophobicity melamine formaldehyde resin foam plastics after drying.
Embodiment 5:
A kind of hydrophobicity melamine formaldehyde resin foam plastics, are made of following parts by weight: 32 parts of melamine, poly
It 22 parts of formaldehyde, 1.2 parts of stabilizer, 18 parts of water, 6 parts of emulsifier, 3 parts of curing agent, 6 parts of foaming agent, 4 parts of blowing promotor, dredges
8 parts of aqua liquid；
The stabilizer is the mixture of inclined sodium sulphate, sodium thiosulfate；Emulsifier is aliphatic acid polyethenoxy ether, fatty acid
The mixture of methyl esters polyoxyethylene ether；Curing agent is, the one or more kinds of of p-methyl benzenesulfonic acid, hydrochloric acid, sulfuric acid, phosphoric acid mix
Close object；Foaming agent is the mixture of petroleum ether, methylene chloride；Blowing promotor is the mixture of polyurethane, nona-fluoro butyl group ether.
The 1L hydrophobing agent liquid is made of following raw material: hydrophobing agent, organic solvent and titanate esters, the hydrophobing agent,
Organic solvent and the mass ratio of titanate esters are 1:(2.3): (0.3).
The hydrophobing agent is the mixing of ten trifluoro octyl triethoxysilanes, 17 fluorine decyl tripropoxy silane
Object；Organic solvent is the mixture of atoleine, machine oil；Titanate esters are monoalkoxy unsaturated fatty acid titanate esters, two (octanes
Base phenol polyoxyethylene ether) mixture in phosphatide.
The preparation method of the hydrophobicity melamine formaldehyde resin foam plastics, comprises the steps of:
(1) paraformaldehyde, stabilizer and water are added in reactor, adding triethanolamine and adjusting pH value is 8.3, is then added
Melamine, at 86 DEG C, stirring to solution clear forms melamine prepolymer resin liquid；
(2) emulsifier, curing agent, foaming agent, blowing promotor are added into melamine prepolymer resin liquid to stir evenly and to be formed
Expanding foam solution and melamine prepolymer resin liquid are poured into mold by expanding foam solution after mixing, be then placed into micro-wave oven with
4500W, foam 7min, forms foamed plastic, then foamed plastic is placed in baking oven, cures 1.7h at 210 DEG C；
(3) use ultrasonic wave with the power of 450W hydrophobing agent, organic solvent and titanate esters, hydrophobing agent liquid is made in ultrasonic 4min；
(4) hydrophobing agent liquid is evenly dispersed in by melamine formaldehyde resin foam plastics by dipping, coating or spray pattern
In, up to hydrophobicity melamine formaldehyde resin foam plastics after drying.
Test example 1:
The contact angle of embodiment 1-5 is detected, using the measuring method of GB/T 30693-2014 using GB/T 17657-
2013 measuring method detects the burst size of methanal of embodiment 1-5, using the measuring method of B/T 6670-2008 to reality
The rebound degree for applying a 1-5 is detected, is carried out using the measuring method of GB/T 6344-2008 to the tensile strength of embodiment 1-5
Detection detects the tearing strength of embodiment 1-5 using the measuring method of GB/T 10808-2006, as a result as follows:
1 hydrophobicity melamine formaldehyde resin foam plastics test result of table
As known from Table 1, using hydrophobicity melamine formaldehyde resin foam plastics obtained by the preparation method in the present invention its
Contact angle is greater than 150 °, and hydrophobic performance is good, and burst size of methanal is lower than the E0 grade 0.5mg/L standard of national environmental protection material requirements, and
And there is good mechanical property.
Claims (10)
1. a kind of hydrophobicity melamine formaldehyde resin foam plastics, which is characterized in that be made of following parts by weight: melamine
30~40 parts of amine, 20~30 parts of paraformaldehyde, 1~2 part of stabilizer, 15~25 parts of water, 4~7 parts of emulsifier, curing agent
2~4 parts, 5~8 parts of foaming agent, 3~6 parts of blowing promotor, 5-20 parts of hydrophobing agent liquid.
2. hydrophobicity melamine formaldehyde resin foam plastics according to claim 1, which is characterized in that the stabilization
Agent is inclined sodium sulphate, sodium thiosulfate, sodium peroxydisulfate, mixture one or more kinds of in sodium sulfite.
3. hydrophobicity melamine formaldehyde resin foam plastics according to claim 1, which is characterized in that the emulsification
Agent is neopelex, alkyl phenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, aliphatic acid polyethenoxy ether, fat
One or more kinds of mixture in sour methyl esters polyoxyethylene ether.
4. hydrophobicity melamine formaldehyde resin foam plastics according to claim 1, which is characterized in that the solidification
Agent is one or more of formic acid, acetic acid, oxalic acid, ammonium chloride, ammonium sulfate, p-methyl benzenesulfonic acid, hydrochloric acid, sulfuric acid, phosphoric acid
Mixture.
5. hydrophobicity melamine formaldehyde resin foam plastics according to claim 1, which is characterized in that the foaming
Agent is pentane, isopentane, n-hexane, petroleum ether, mixture one or more kinds of in methylene chloride.
6. hydrophobicity melamine formaldehyde resin foam plastics according to claim 1, which is characterized in that the foaming
Auxiliary agent is the mixture of one or more of silicone oil, polyurethane, nona-fluoro butyl group ether.
7. hydrophobicity melamine formaldehyde resin foam plastics according to claim 1, which is characterized in that the 1L is dredged
Aqua liquid is made of following raw material: hydrophobing agent, organic solvent and titanate esters, the hydrophobing agent, organic solvent and titanate esters
Mass ratio is 1:(0.1~3): (0.1~1).
8. hydrophobicity melamine formaldehyde resin foam plastics according to claim 1, which is characterized in that described is hydrophobic
Agent is modified poly(silicon aether), polysilicon acid propyl ester, fluorination ethoxylate urethanes, ten trifluoro octyl triethoxysilanes, 17 fluorine
One or more kinds of mixture in decyl tripropoxy silane.
9. hydrophobicity melamine formaldehyde resin foam plastics according to claim 1, which is characterized in that described is organic
Solvent is the mixture of one or more of ethyl alcohol, isopropanol, n-butanol, atoleine, machine oil；The titanate esters
For compound phosphoric acid type monoalkoxy class titanate esters, monoalkoxy unsaturated fatty acid titanate esters, two (octyl phenol polyoxyethylene
Ether) mixture one or more kinds of in phosphatide.
10. the preparation method of hydrophobicity melamine formaldehyde resin foam plastics according to claim 1, feature exist
In comprising the steps of:
Paraformaldehyde, stabilizer and water are added in reactor, adding triethanolamine and adjusting pH value is 8~9, is then added three
Poly cyanamid, at 80~95 DEG C, stirring to solution clear forms melamine prepolymer resin liquid；
(2) emulsifier, curing agent, foaming agent, blowing promotor are added into melamine prepolymer resin liquid to stir evenly and to be formed
Expanding foam solution and melamine prepolymer resin liquid are poured into mold by expanding foam solution after mixing, be then placed into micro-wave oven with
1000~5000W, foam 3~10min, forms foamed plastic, then foamed plastic is placed in baking oven, cures at 180~260 DEG C
1~2h；
(3) use ultrasonic wave with the power of 200-500W hydrophobing agent, organic solvent and titanate esters, ultrasonic 1-5min is made and dredges
Aqua liquid；
(4) hydrophobing agent liquid is evenly dispersed in by melamine formaldehyde resin foam plastics by dipping, coating or spray pattern
In, up to hydrophobicity melamine formaldehyde resin foam plastics after drying.
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