SU1270133A1 - Glass - Google Patents

Abstract

GLASS, including SiO.,,. AljOj, CaO, MgO, NaaO,,, Se, characterized in that, in order to obtain a heat-absorbing glass of neutral tone with a ratio of Luminous fluxes l jso / Sio 1, 1 1.25 and increase the absorption to infra; the red region of the spectrum, it additionally contains MnO in the following ratio of components, wt.%: SiOj65.0-75.0 ,, 0.1-5.0 CaO2.0-9.0 MgO1.0-5.0 Na. O 10.0-15; 0 KjO 0.1-5.0 FejOj0.05-0.5 with S Se0.0011-0.2 MnO0.0005-0.3, (L and 1MnO + Se 0.0016-0 ,four

Description

YU

00 CO 1 The invention relates to glass compositions which can be used as light filters for greenhouse glazing. Conventional window glass has the highest light transmission in the 4PO-500 nm region and slightly lower light transmission in the wavelength range of 600-800 nm, due to the presence of iron oxide in the glass. The use of window glass for glazing greenhouses does not create favorable conditions for the development of plants. Plants can grow normally only in the light of a certain spectrum of composition and intensity. In plants, the most important physiological process occurs in light — photosynthesis, which depends on the strength and spectral composition of light. For the harmonious development of plants, a full spectrum of visible solar radiation is needed. However, photosynthesis is most intense with red-orange rays, weaker with blue-violet and almost does not occur with green rays. - (. Therefore, for the glazing of greenhouses i, a light filter is necessary that absorbs green rays and transmits maximum rays in the range of 650–700 nm, i.e. the ratio of light fluxes must be greater than 1. The purpose of the invention is to obtain a neutral heat-absorbing glass of 33 tones the light fluxes are 1.1-1.25 and the increase in absorption in the infrared region of the spectrum.The specific glass compositions are given in Table 1. The lighting characteristics of the glasses are listed in Table 2. According to the chemical stability, glass belongs to the III-IV hydrolytic class. As raw materials for glass melting, sand, alumina, dolomite, chalk, soda, potash, iron oxide, metallic selenium, pyrolusite, or potassium permanganate are used. Glass melting is carried out at a temperature of 1430-1450 ° C in gas furnaces or baths. and production by pressing or drawing a glass ribbon. The resulting glass has a high translucency in the visible part of the spectrum (66-80%), a maximum of red rays (70-85%) in the range of 650-700 nm and a high absorption of infrared rays ( 50-63%). The glass provides the lighting characteristics required for normal plant development: increased light transmission in the visible spectral range, the ratio of light fluxes of 650 equal to 1.1-1.25, and an increase in the absorption of infrared rays, which makes it possible to use it. Table 1

Continuation of table 1

MnO

0.0005 0.3 0.2 0.1 EMnO -t- Se 0.0065 0.4 0.20011 0.3

% 5 mm)

-707576

.666970

707471

727780

788485

758284

606354

Ratio of light BSCF flows SbO /

/ 5301.1 1.14 1.2

0.0005 0.05 0.0016 0.056

Tables a 2

57 62 63 62 60 60

73 66 67 79 84 79

70 68 69 73 79 76

53

35

55

1.16 1.14 1.25 0.95

Claims (1)

GLASS including SiO _? ,. AljOj, CaO, MgO, Na ₂ 0, K _g 0, Fe ₂ 0j, Se, characterized in that, in order to obtain a heat-absorbing glass of a neutral tone with a light flux ratio _{ΐ ΐ50} / Φ _5Λο = 1,11.25 and increase the absorption in infra: red region of the spectrum, it additionally ¹ contains MnO in the following ratio of components, wt.%: Si0 ₂ 65.0-75.0 A1 _g 0, 0.1-5.0 CaO 2.0-9, Ο- MgO Ι, 0-5.0 Na ₂ .0 10.0-15, -0 to _r about 0.1-5.0 ^Fe 2 ° 5 0.05-0.5 Se 0.0011-0.2 MnO 0.0005-0.3, where Σ MnO + Se = 0.0016-0.4