SU448208A1 - The method of obtaining urea-formaldehyde foam - Google Patents

Description

The invention of omomes to obtain tsochevyi-formaldehyde penoplashov.

A known method for the preparation of formaldehyde-free foamed foam by foaming and curing the urea-formaldehyde resin in addition5; Bia of surfactant and acid carbonyl carbon

Petroleum sulfonic acid with resorcinol is used as a surface-active substance, and hydrochloric and other acidic catalysts are used as acidic catalysts.

The lack of eugo method is fo, 4fo, the obtained foam layers have low mechanical strength, high organic water absorption and high technological shrinkage (shrinkage during the drying of the foam to air-dry resin;) |

The purpose of the invention is to improve the physico-mechanical properties of urea-formaldehyde foam

For the aforo according to the proposed method, triethanolamine salts of sulfonated fatty alcohols of the general formula are used as surfactants.

where B is JP and wild alcohols are fatty and oh,

in the amount of 1.0-2.5 weight.h, per 100 weight.h. resin.

Triethanolamine lauryl sulfate or triethanolamine secondary alkyl sulfates are used as triethanolamine salts of sulfonated fatty alcohol.

Secondary alkyl sulphates tri | ethanol1: ina are alkyl sulphates on

the basis of the syngaic SOS fatty alcohols, isolated from the alcoholic fraction, obtained by npEf oylviiiovov (experience of obtaining higher spyrgov).

Fractional coaxing syngetic fatty alcohols,

No more than 15

G,

WITH

B 12 Not more than 80

n 20

Cr-- P. 12

above C

Not less than 5

20

In the presence of alcoholic groups in reeganolain, it is possible that it is chemically reacted with yoko-fluoride-aldehyde resin, as a result of which the physical and mechanical properties of the foam-plastic (improved mechanical strength, reduced water absorption and technological shrinkage) are improved.

Obtaining a foam according to the proposed method is carried out as follows,

Bytes metal container placed syes trietanolayina lauryl (or secondary alkyl sulphates triethanolamine) ortofosfor- hydrochloric acid and water (AOO solution) with pereueshivayut poyoscha mechanical yeshalki for 1-3 myn to form a stable foam is added without stopping the stirring, mocheviBo- fsmaldehyde resin and continue mixing in. ID-I5 sec.

The resulting foam is transferred into a mold. After drying in air for 3 days, the foam is subjected to tests,

The foam of the proposed method can also be obtained on any mixers and installations of periodic and continuous operation.

It is especially advisable to use the proposed method in cases where it is necessary to fill all-in-one structures of residential and production buildings with liquid foam plastic in order to insulate them.

Example I. 100 ml of an ABi solution (1.5 parts by weight of triethanolamine lauryl sulfate, 2.8 parts by weight of ortho-phosphoric acid and 95.7 parts by weight of water) with an acid number of 35 ml. CON / H ABO are placed into a metal cup and using a mechanical stirrer C & 1400 rev / s)

stirred for 1 hour (2 minutes, K), formed without mixing, added 100 ml of an aqueous solution of urea – formaldehyde smosh brand (1: 1 dilution of resin water) and continued stirring for another 15 seconds. Foaming ratio put in a cardboard form and after drying in air for 3 days, they are tested.

A foam is obtained with an apparent density of 15 kg / t and a uniform dense structure, a compressive strength of 0.18 kgf / cm2, water absorption of 0.2 kg / m2,

Example 2 “Foam is obtained in the same way as in Example 1, but in the ABO solution. The amount of triethanolamine lauryl sulfate is 2.0 wtf. The rate of foaming is equal to 28.

The resulting foam has an apparent density of 18.6 kg / m compressive strength of 0.23 kgf / s and water absorption of kg / m2.

Example 3 Polyfoam is prepared in the same manner as in Example I, but for preparation of ABO, 1.5 HP are taken. secondary alkylsul 35 fatov triethanolamine. Foaming ratio is 25

The foam has an apparent density of 28.8 kg / m, a compressive strength .Q limit of 0, al KSG / QU. And a water absorption of 0.238.

Example 4 “Foam is obtained using a continuous installation. ABO is prepared as

45 in example I, and uabavinone the UKS formaldehyde resin is diluted with water in a ratio of 1: b. The ABO solution is foamed with compressed air in the sipe from

50 compressors with a working pressure of 7 kgf / cm and a capacity of 0.5 "e / min. ABO and resin solutions are metered with a plunger pump in a 1: 1 ratio and with Proi5 with a capacity of 3.5 l / min for each pump. Foaming crown is N / 30.

The resulting foam had an apparent density of 18.8 kg / m, a compressive strength of 0.27 kgf / cm and a water absorption of 0.385 kg / m2.

Example 5: Podachash foam plastic is the same as in 4 "but using a compressor with pressure

П КГС / СЫй,

IMA9b foam, 1 ° C flJioiHQcib 31.7 kg / n, HOOSH limit when compressed 0.7 kgo / cm2 and water absorption 0.229 kg / m2,

P r and 8 p 6, I get the foam faK same as in the example, but the working pressure in the compressor is CQCfaBauef 8-9 afM.

Penoplao HMees Kaiyuiyioes n ofHocfb 17.4 kg / i. dredoл „otherHoofii cert ozhaoi 0.19 kg / ohm and water content 0,288 CU / M,

Example 7, I get a foam, NAC in the example of the working Air pressure in the air compressor 8 co-a1l e "IZ kg / ohm"

Pvnopdaskh imeeh, the apparent area is 82.1 kg / m, the compressive strength at compression is 0.78 kgf / cm2, water absorption is 0.8X2 kg / s.

Similarly, the amount of foamed plates using 1.7 parts by weight of 7 av. Sulfonic acid in the amount of 1.7 wt.h. with the addition of 0.18 weight.h. Reged is 100. solution

B tab. The test results of urea-formaldehyde foams obtained by the known and proposed methods are compared.

Comparative data on the technological shrinkage of foams, obtained from the known and proposed; methods are summarized in table. 2

Table I

sulphates of trietano ammn

Method

Eshh

In 8rysh @ forshch In ofKpHfHe farm

At the site of the company 1 and with Q to improve Fiesh-yvhanm cheekih GBoMcfs of the FINAL opoivifazo

yeaiSSjuJ:

naa

1in

F8 &

5-7

Is5-as5 Hes 0, K8S g saigGfie surfactant-based appl- ation of new sriganols new emol- ated sulfonated fatty acids of the general Formula / TCCILGHpOHjo / j HI “OSOnP, ,, oadmkal oyiotot gy oto g zytogy zy goghoy zy otog y zyotogy zy goghojjo / j HI“ OSOnP, ,, oadmkal oiyot oytogy zy g otoyk zyiotogy zy g oto zy otoy oyi otoyi zy otoyi zy otoyi zyrotogy zy otoyi zy otot oy ovm oytot yyotogy zy g otoy zy otot oy otoma oi ohm otot otoo io otocnio OSOnP .. per 100 resin