A kind of production technology of melamine resin foam sponge
A technology of foam sponge and melamine resin, which is applied in the field of organic synthesis, can solve the problems of high brittleness, low tensile tear strength, and easy powder drop, and achieve low brittleness, high tensile tear strength, and not easy powder drop. Effect
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Embodiment 1
[0041] The present embodiment provides a kind of production technology of melamine resin foam sponge, comprises the following steps:
[0042] (1) Take melamine and paraformaldehyde with a molar ratio of 1:3 and mix them evenly;
[0043] (2) The mixed material is imported into the first screw machine by the material pump, and 0.3% NaOH aqueous solution is added at the feed port of the first screw machine, so that the pH value of the internal material is 9, and the reaction system reacts during the conveying and mixing process. The time is 8min, and the reaction temperature is 120°C;
[0044] (3) Add 20% sodium bisulfite aqueous solution at the feed end, middle position or end of the first screw machine; the addition amount of the auxiliary material solution is 0.05g / g relative to the mixed material.
[0045] (4) The transparent resin extruded from the outlet of the first screw machine enters the second screw machine, and the polymerization reaction is continued in the second s...
Embodiment 2
[0062] The present embodiment provides a kind of production technology of melamine resin foam sponge, comprises the following steps:
[0063] (1) Take melamine and paraformaldehyde with a molar ratio of 1:2 and mix them evenly;
[0064] (2) The mixed material is imported into the first screw machine by the material pump, and 0.2% triethylamine aqueous solution is added at the feed port of the first screw machine, so that the pH value of the internal material is 8, and the reaction system reacts during the conveying and mixing process , the reaction time is 10min, and the reaction temperature is 80°C;
[0065] (3) Add 10% sodium sulfite solution at the feed end, middle position or end of the first screw machine; the addition amount of the auxiliary material solution is 0.1 g / g relative to the mixed material.
[0066] (4) The transparent resin extruded from the outlet of the first screw machine enters the second screw machine, and the polymerization reaction is continued in the...
Embodiment 3
[0083] The present embodiment provides a kind of production technology of melamine resin foam sponge, comprises the following steps:
[0084] (1) Take melamine and paraformaldehyde with a molar ratio of 1:4 and mix them evenly;
[0085] (2) The mixed material is imported into the first screw machine by the material pump, and 0.5% NaOH aqueous solution is added at the feed port of the first screw machine, so that the pH value of the internal material is 10, and the reaction system reacts during the conveying and mixing process. The time is 5min, and the reaction temperature is 160°C;
[0086] (3) Add 45% sodium metabisulfite aqueous solution at the feeding end, middle position or end of the first screw machine; the addition amount of sodium metabisulfite aqueous solution is 0.01g / g relative to the mixed material.
[0087] (4) The transparent resin extruded from the outlet of the first screw machine enters the second screw machine, and the polymerization reaction is continued i...
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