DE1595032A1 - Process for the continuous production of molded materials based on melamine resin - Google Patents

Description

Patenlanvsftlt
ZELLENTIN & LUYKEN 1595032

8000 Munich 22
ZwcibrOckenstr. 6th

Nautschno-Issledovatelskij Institute November 20, 1969 Piastitseheskich Mass,

Moscow / USSH

P 15 95 032.0-44 P 6322

Ancestors for the continuous production of Press fabrics based on Ifelarainhars

The invention relates to a method on continuous | Manufacture of molding materials on the basis of Melaaln formaldehyde resins

According to a known method, the condensation of melamine is carried out at temperatures of ait fornalin highest * 80 ⁰ C under Kormaldruck ia alkaline Uediua ia rotation · a few hours; the resin formed is mixed with cellulose and other additives at temperatures of 30 to 40 ⁰ G »then dried and crushed · Da almost ' -

all stages of this procedure run continuously, making regulation and automation difficult The discontinuous cooking of resins in devices with a relatively large volume leads to local Overheating and fluctuations in the Zusasuaeneet · » tongue and in dan üügonacaaften the harse; demand south many process stages »such as cooking, mixing and Dry the application of manual labor and are accompanied by harmful gas and dust separation «The

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lengthy, discontinuous operations naturally require extensive equipment as well increased operating expenses Finally, let the interception doa formaldehyde and methanol difficult.

Hon has ready proposed "continuously eu make the process referred to in such a way that purpose resin preparation continuously over heated surfaces at temperatures of 120 to 300 ⁰ O and pressures of from 5 bi · 50 ° 0 performs the Reaktionsteilnehiaer in small portions, and then the obtained Condensation product before or after dewatering old filler added · Apart from the relatively high temperatures and bridges used, working in expensive thin-film equipment is cumbersome · In addition, the adhesion of the Earsee to the filler leaves something to be desired.

The task on which the present invention is based consists in eliminating the disadvantages mentioned by developing a «simple process ·

immediate
for the continuous / production of pressed materials as the starting point is open, in the case of calibration the condensation and the incorporation of the filler are linked together.

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The stated object is thereby achieved according to the invention solved "that atm dl" condensation

(A) in the first stage la alkaline. Medium at temperatures from 100 to 16O ⁰ O and pressures from β to 20 at to xu oinea.

groups from 2 to 13 # la. Absence of £ »- *

talysator and? iUlnahmoff and

(B) in the second stage la presence of these additives in the acidic Kediun at temperatures τοη 40 to 90 ⁰ G su iSade leads

As an Eatalyoator, aan roraueweise Phthalaaureid "

example

In the upper part of a cylindrical device, which is provided with an agitator and filter base, 73 kg of weight and 155 kg of weight are continuously introduced with the help of a metering device. pH from 6.9 to 8.4- neutralized formaldehyde. During the passage through the ^{apparatus, which is heated to a temperature of 80 to 90 0} C, the Uelaain can be dissolved in the course of 1? ain la porealdehyde on

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The resulting oil is filtered and a metering pump is fed to the heatable pressure tube reactor. In this wipe is at a temperature '120 and 1-40 ⁰ C and pressure of 10 oinem at in the course of 5 Jain υ performed ine precondensates bia the content of the ICondensationsproduktes to Kethylolgruppen exceed 1J5%>; from the Yorkondoneate obtained, some of the moisture is also continuously driven off in a pipe apparatus «

Anechließend the Yorkondensat is ait serkleinertea pulp and additives "such as titanium dioxide and zinc et ear at mixed in the presence of Phthalslureeozoireid at a Teuperttur of 70 ⁰ C and auakondenßiert ·

In this second process stage, are calculated

on the Gereicht dee Ausgabeaaelejoinfi, genoaunent 75 wt. '^ Pulp

0.1 bic 0.2 wt. # Phthsleäurenonoureid | 0.2 to 0 _t 4 wt.; I titanium dioxide

0.4 % by weight zinc ethoxate.

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The evenly stirred mass is dried at temperatures between 10 5 and 180 ⁰ O and then comminuted.Formaldehyde and methanol are separated from the condensate obtained during the partial white drying process and reused.

The invention process enables the builder of the condensation, the incorporation of the filler and the drying "of the pre-toffee / water obtained", the apparatus equipment and the operating expenses "and the mechanization and partial automation of the manufacturing process, the nomogeaiit and dlo (Quality iroa Pressntoffen essential to verbeaaera · / * tu kürstn _t

BATH

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Claims (1)

ZELLENTIN AND LUYKEN MOO Munich 22 ' β ZwlhiOdMMlr. * 20th November 1969 P 15 95 032.0-44 ρ Pat en t to op vClcho A method aur continuous preparation of i »reßstoffen melamine resin base by condensation of melanin nit 3JOrualdohyd under pressure" HEATER on boi temperatures obcrhalt 100 ⁰ C and pressures above 5 at in Gö ^ anHort oinoa catalyst and £ inarboiten of filling nt off in the Kondonoationaprodukt, characterized ßJcuansoichnot that one dio Konaoaeation (A) in the first on StuXo in the alkaline I.Iodium at Tcmperaturon from 100 to 160 ⁰ O and pressures of. 5 to 20 at up to a methylol group content of 2 to 13 % in the absence of catalyst and filler and (B) in the second stage in the presence of these additives in the acidic iodium at temperatures of 40 to 90 ⁰ O leads to the end. 2 «A method according to claim 1 characterized in _t 'that raan used as a catalyst Phthaisäureuonoureid" New documents 009815/1707