SU131082A1 - The method of obtaining furfural resin - Google Patents

Description

It is known that furfural in the presence of acid catalysts immediately gives non-meltable and insoluble gums, this is the stage of formation; fusible and soluble resins, which makes it impossible to use these polymers in the technique; in the alkaline medium, furyl fur and furyl carboxylic acid are formed from furfural.

The described method provides a transparent and soluble Iep.Mo-resistant resin. This is achieved by the fact that the resinification of furfural wire is heated by heating at 150-210 ° in the presence of 0.5-10% (by weight of furfural)

 or their PROZ ZOD YX.

The resulting soluble and thermostable furfurol is made for the best thermal stability.

Furfural and amine in the amount of 0.5-10% (depending on the heating temperature) are loaded into the reactor equipped with a reflux condenser and mesh., And P is heated for 10-24 hours (depending on the amount of amine) at 150 -210 ° (depending on the pressure) on the bale until the temperature of the vapor temperature over the reaction mass ceases. After that, the cooler switches to Direct and is evaporated under normal or reduced pressure at 140-170 ° to form a solid (in a cold state 1i) and soluble cel.

Example. Preparation of furfural yu resin.

Furfural with hexamethylenteramidum (in the amount of 8 ° from furfural) is heated in the reactor to a temperature (at the onset of the return to the refrigerator) 154-160 ° and the mixture is kept for 10-14 hours until the reduction in temperature of vapor over the reaction 10 is reached: {mass. After switching the cooler to direct and forming a viscous polymer product, they are heated to a temperature of 70-180 ° for distillation, i.e. BCTvnnBme o, to react to furfural and to form a solid resin (in a cold state). Zlgel see

Eh 131082-2 -

cooled to a temperature of 120-130 °, after which it can be used for the manufacture of plastics. The yield of resin but furfural is 62-70%.

Example. Preparation of press products with mineral half-glass - fiberglass.

The resin is dissolved in acetone (50% solution) and an impregnated glass cloth solution (at the rate of 40% resin, 60% fabric), and the heat treatment agent is treated at a temperature of 250-300 ° for 6 hours to remove sizing. Then the impregnated fiberglass is dried at 120 ° for 2-3 hours, after which it is subjected to Compressed-yu at 300 °, specific pressure 100-150 kg / cm and exposure 3-6 min / mm. Fiberglass pa on the basis of furfural resin has the following properties:

1.Specific impact viscosity. . . 260 -270 kg cm / cm2. Temporary static resistance.

bend. 2000-2200 / sg / b- and 2

3. Martens heat resistance is greater. . 250 °

4. Deformation when tested on the device

Zhurkov to a temperature of 400 °. . .missing

5.Flammability ........ does not burn

6.Specific surface resistance

in delivery status .... 8 -9 10

7.Specific surface resistance to losle

48 hour stay at 100% relative

humidity 6-8 10 °

8. The tangent of dielectric loss angle

50 Hz in the state of 1 delivery. . .0,017 -0,018

9. The tangent of dielectric loss angle

100% relative humidity. .0.06 -0.08

11 p e. 1 mete n. about b

Claims (2)

1. A method for producing furfural resin, characterized in that. that, in order to obtain a soluble and heat-resistant resin, the resinification of furfural is carried out: by heating at a temperature of 150-210 ° C in the presence of 0.5-10% (by weight of furfural) amines or their derivatives. 2. The use of the resin according to claim 1 for the radiation of plastics with high heat resistance.