SU1326579A1 - Composition for foam plastic - Google Patents

Abstract

The invention relates to the production of heat insulating material used in agriculture for warming shoulders with vegetables. The invention makes it possible to increase the tensile strength of the foam under compression by a factor of 1.5 due to the use of the following composition as a composition, wt%: urea formaldehyde resin 20-30, surfactant 4-6, 5% aqueous solution of phosphoric or phosphoric acid hydrochloric acid 15-17, glycerin 1-1.8, 1,2-ethanediol O, 1-0.3, 2-tetrahydrofurylmethanol 0.05-0.2 and water 44.85-57.8.2 table.

Description

Isorethylene refers to the production of heat insulating material used in agriculture for warming shoulders with vegetables.

The purpose of the invention is to increase the compressive strength of the foam.

As special additives, the composition contains 1,2-ethanediol and 2-tetrahydrofurylmethanol.

1,2-Ethanediol () is a colorless syrupy liquid. T, kip, 197.5 ° С, density at 20 ° С - 1115.5 kg / m, refractive index p 1.4319,

2-Tetrahydrofurylmethanol (C H) is a colorless liquid. Its density at 20 s 1053 kg / m, boiling point 178 C,

The surfactant used is a mixture of sodium salts of sulfate esters of secondary alcohols containing 6–16 carbon atoms obtained from the fractions in α-olefins with t, kip, 00–170 ° C (Tipol) to 100–320 ° C (Progress ),

The composition is prepared according to the following technology

In a mixer with a stirrer at 20 ° C

Urea formaldehyde

resin Ml 9-62

KF-MT

Surface-active substance

Progress

Tipol

Phosphoric acid

(5% aqueous solution)

Hydrochloric acid (15%

water solution)

Glycerol

1.5 1.8 1.0 1.5 1.5 1.5

glycerol is injected into the mass; In an agitator equipped with a compressed air bubbler, the surfactant is mixed with an acid hardener.

Then, with the stirrer running and the compressed air supply turned on, 1,2-zthanediol and 2-tetrahydrofurylmethanol are introduced into the mixture. After stirring for 180 seconds, the mixture is poured into an apparatus with the prepared resin solution and everything is stirred until a homogeneous mass is formed. Then the whole mixture is drawn into prepared forms at the place of use, ibid.

hardening and drying of the casting genoplast is carried out. Hardening time 360 s. Su1ak time not more than 3 hours

TabLo 1 shows the formulations of the com position, in Table 2, the comparative properties of the proposed, known and control compositions with the separate administration of 1,2-ethanediol and 2-tetrahydrofuryl-1 methanol in the proposed composition and the introduction of 2-t €; trahydrofuryl methane

in combination with the known additive - 1,4-butanediol.

Table 1

20 25 25

25

sixteen

J5 15

15

Continuation of the table.1 Components Content of components for example, May.%

 FIP.

1-2-EthanediolO, 15 0.30,10.2

2-Tetrahydrofurylmethanol 0.2, 0.05 O, -0.20.2

1,4-butanediol ---- 0.2

Water54,15 44,8557,854,354,354,1

table 2

IndicatorsCompositions by examples

predlozheniem

I I 2 3 4 5 6 Volume weight, kg / m 32.4 33.7 31.8 - - 33.2 32.9

Compressive strength, MPa10

Water absorption,% Water absorption,%

Heat conductivity after water absorption, W / mK

1.38 1.35 1.31 0.87 0.42 0.94 0.89 11.8 12.0 12.1 - - 12.2 4.2 4.2 4.1 - - - 4.2

0.0241 0.02400.02410, 024

The absence of one of the components in the proposed composition, 1,2-ethanediol or 2-tetrahydrofurylmethanol, does not allow to achieve the goal. Only with the introduction of both components into the composition in the quantities provided for by the proposed limits does the synergistic effect take place — the compressive strength increases.

The consumption of 2-tetramethylene glycol and 1,2-ethanediol, which is beyond the specified limits, is not appropriate. This is due to the fact that

0.0241

reagents smaller than the lower suggested limit, the compressive strength of the foam does not increase. When reagent consumption is greater than the specified upper limit, the strength of the foam produced is 139 kN / m when compressed, and the consumption of reagents increases significantly.

When using 1,4-butanediol as the dihydric alcohol, no improvement in foam properties is observed.

Claims (1)

Claims. A foam composition comprising a urea formaldehyde resin. 513265796 aqueous solution of orthophosphoric or co-Urea-formaldehyde acid, surfactant resin - 20-30 a substance based on a mixture of sodium orthophosphoric or salts of sulfate esters of secondary salt and acid alcohols containing 6–16 carbon-5 atoms (5% aqueous solution I5-J7 sort, glycerin, diatomic alcohol andSurface active water, wherein substance 4-6 that, in order to increase strength when foam compression, it is in quality Glycerin1-1,8 dihydric alcohol contains 1,2-O1,2-ethanediol0,1-0,3 ethanediol and additionally - 2-tetra-2-tetrahydr6 furi.t1 methagidrofurylmethanol with the following corresponding iol 0.05-0.2 the components, wt,%: WaterOther