Stabilizer for polyurethanes based on polyethers and aromatic diisocyanates

 

(57) Abstract:

Usage: to obtain polyurethanes based on polyethers and aromatic diisocyanates. The essence of the invention: a combination of bis-(4-hydroxy-3,5-di-tert-butylphenylphosphine)phosphite with 2,2,6,6-tetramethylpiperidine - 2,2,6,6-tetramethylpiperidinyloxy acid at a mass ratio of 1 : (1 - 5). Polyurethane films containing stabilizer, a long time retain the original color. table 1.

The invention relates to the chemistry of macromolecular compounds, namely stabilizing polyurethanes, and can be used to produce polyurethanes based on polyethers and aromatic diisocyanates, do not change color during operation in the photo - and thermo-oxidation.

Polyurethanes (PU) based on aromatic diisocyanates under the action of solar radiation, temperature, oxygen (photo and thermooxidation) change color, which leads to deterioration of the appearance of bright products of PU and, consequently, to the reduction of commercial quality.

It is known the use of organic phosphites (1) and the piperidine derivatives (2) as stabilization PU.

The closest in technical essence to the invention is a stabilizer for the PU based on polyethers and aromatic diisocyanates consisting of organic phosphite, antioxidant and UV absorber (3). As organic phosphite use of compounds of General formula R1O P(OR2) (OR3), for example, diphenylphosphite. In use as an antioxidant phenols. As the UV absorber used derivative benzotriazole. The disadvantage of the stabilizer is low svetostoyjkostj PU with photo and thermooxidation, due to the formation of colored products of transformation.

The aim of the invention is to improve operational properties of PU by increasing its svetostoyjkostj with photo and thermooxidation, as well as expanding the range of effective stabilizers for PU.

This objective is achieved in that the stabilizer for the PU based on polyethers and aromatic diisocyanates contains organic postit and antioxidant. According to the invention as organic phosphite using bis-(4-hydroxy-3,5-di-tert-butylphenylphosphine)-fosfat (4), and as an antioxidant use derived piperine inventive stabilizer for PU with a known stabilizer shows its use allows to get high quality PU, long time preserving the original color under the action of solar radiation and temperature, which is especially important when making materials, bright colors.

The invention is illustrated by examples of stabilization of the films obtained from PU water dispersion based polypropylenglycol and 4,4'-diphenylmethanediisocyanate, as a typical representative of the PU on the basis of polyethers and aromatic diisocyanates.

P R I m e R 1. 100 wt.h. polyurethane synthesized on the basis of polypropylenglycol and 4,4'-diphenylmethanediisocyanate at a molar ratio of groups NCO:OH = 2:1, are dissolved in 16.6 wt.h. of acetone. To the resulting solution was added with stirring to 15.5 wt.h. chain extension. After 3.5 min under the same conditions of agitation to the resulting product is poured 150 ml of water. After distillation of the acetone receive PU dispersion (TU 6-55-221-1157-90). In PU dispersion is added to 1.0 wt.h. bis-(4-hydroxy-3,5-di-tert-butyl-phenylpropionitrile)-phosphite (BPGP) and 1.0 wt.h. 2,2,6,6-tetramethylpiperidine 2, '2', 6', 6'-tetramethylpiperidine-linepro - pianoboy acid (diazeam 5), which corresponds to the mass ratio of the components of the stabilizer 1:1.

The UP> M. the Film is irradiated 34 hours with a xenon lamp with an intensity of UV radiation, determined by GOST 16948-79, 5.5 W/m2or is heated for 2 h at 100aboutWith on the air. Svetostoyjkostj PU with photo and thermooxidation appreciate the magnitude of the transmittance (T%) at a wavelength of 400 nm (6), measured on the spectrophotometer SF-4. The rate of yellowing appreciate the value T of the initial and irradiated (or heated) sample.

The performance of the obtained film and the results are given in the table.

P R I m m e R 2. In PU dispersion obtained as in example 1, add 0.7 wt.h. BPGF and 2.1 wt.h. diazeam 5, which corresponds to the mass ratio of the components of the stabilizer 1:3. Receive and experience the film as in example 1. The performance of the obtained film and the results of the tests in the table.

P R I m e R 3. In PU dispersion obtained as in example 1, add 0.4.h. BPGF and 2.0 wt.h. diazeam 5, which corresponds to the mass ratio of the components of the stabilizer 1:5. Receive and experience the film as in example 1. The performance of the obtained film and the results are given in the table.

P R I m e R 4 (control). In PU dispersion obtained as in example 1, add 1.6 wt. including FFT and 0 is live film as in example 1. The performance of the obtained film and the results are given in the table.

P R I m e R 5 (control). In PU dispersion obtained as in example 1, add 0.3 wt.h. BPGF and 1.8 wt.h. diazeam 5, which corresponds to the mass ratio of the components of the stabilizer 1:6. Receive and experience the film as in example 1. The performance of the obtained film and the results are given in the table.

P R I m e R 6 (control). In PU dispersion obtained as in example 1, do not add stabilizer. Receive and experience the film as in example 1. The performance of the obtained film and the results are given in the table.

P R I m e R 7 (control). In PU dispersion obtained as in example 1, add 1.0 wt.h. BPGF. Receive and experience the film as in example 1. The performance of the obtained film and the results are given in the table.

P R I m e R 8 (control). In PU dispersion obtained as in example 1, add 1.0 wt.h. diazeam 5. Receive and experience the film as in example 1. The performance of the obtained film and the results are given in the table.

P R I m e R 9 (prototype). In PU dispersion obtained as in example 1, add 1.0 wt. including diphenylvinylene is to see the film, as in example 1. The performance of the obtained film and the results are given in the table.

As the table shows, the use of the inventive stabilizer allows you to obtain unpainted PU film with high sitosterolemia with photo and thermooxidation, namely, the transmittance of the film with the inventive stabilizer after irradiation decreased by 24-28%, after warming up to 12-16%, while the transmittance of the film with a known stabilizer decreased, respectively, 51% and 34%. Thus, svetostoyjkostj film with the inventive stabilizer during photo - oxidation of 1,5-2 times higher, and at thermooxidation in 2-2,5 times higher than the film with a known stabilizer.

STABILIZER FOR POLYURETHANES BASED ON POLYETHERS AND AROMATIC DIISOCYANATES, including organic postit and an antioxidant, wherein, with the aim of increasing svetostoyjkostj polyurethanes with photo and thermooxidation, as organic phosphite it contains bis-(4-hydroxy-3,5-ditretbutilfenol)FOSFA, and as an antioxidant - 2,2,6,6-tetramethylpiperidine 2', 2', 6', 6'-tetramethylpropylenediamine acid at a mass ratio of 1 : 1 to 5.

 

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