SU833616A1 - Enamel - Google Patents

Description

The invention relates to the composition of low-temperature white fluoride-free enamels widely used for the production of protective and decorative coatings in many industries.

Known enamel tl / containing, wt.%:

. 32-40

SiOz. 14-21

NaaO 3.5-5

ZrO-L 0.9-1,4

Coao

3-7

A1aOz

1.2-4.5

KjO 1-2,8

PiOy 1.5-4.1

F 17.5-20.5

85.0,

3-5

TiOj 2.2-6

Cao

A disadvantage of the known enamel is the content of fluorine in its composition, which negatively affects the sanitary-hygienic working conditions during smelting, as well as the low diffuse reflection of 70-72%.

Closest to the proposed composition of enamel 121, containing, weight. SiCa 30-35; AliO, 3-5i 18-23; N32.0 1.5-10; KjO 3-6.5; TiO / g 1518 / 2rOaO, 5-2.8; MgO 0.17-0.54; .

 3.6-6.0 / NagSO 0.8-2.0; COjO 0.03-0.06; CaO 1.15-3.0.

The disadvantage of this enamel is relatively low alkali resistance, diffusion reflectance and spreadability.

- The purpose of the invention is to increase the alkali resistance, whiteness and flowability.

0

The goal is achieved by the fact that enamel is inclusive. S iOjj., -.

By 2.0,

AlaO,,

2:%.

g-7 v.-2.-i- Сo, j.O contains the indicated components in the following amounts.

weight.%:

30-42 SlOo.

3-5 At / l03

16-23

V2.0

0

S-14 NaiO

3-7 kg

15-19 TiOa

3-8

PiOjr

0.5-4.0 ZrOi

five

, 0.02-0.08 Sod-O

For the preparation of enamel, for example, composition, weight4%: SiOj 37; 3.5; 21.6; NajjO 8, - K, L 6.5; TiOi 17.8 / PaOs- 5, ZrOi 0.55; SoaOz 0.05, use of the charge materials (based on 100 kg of Frit

kg:

Quartz sand 37.2 Bora crystalline 9, 6 Aluminum hydroxide 5.4 Thrisodium phosphate 26.7 Kaliev nitrate 14.0 Titanium dioxide 17.8 Cobalt oxide 0.05 Zirconium ore 0.88 Borna acid 32.1

Melting of the enamel is carried out at 11,801,200 ° C until full penetration with afterwards generation by granulation.

on the water.-;

Grinding of enamel is carried out in a ball mill to a fineness of 8-10 (according to a vessel of Lysenko, Azarov method).

To obtain an enamel slip, the components are loaded into the mill, parts:

Frit100

Clay Chasbvsk 4 4 5

. Potassium chloride 0.05

Water35-45

The enamel slip is applied on pre-primed products and burned for 3-4 minutes at 720-800 s.

In tab. 1 and 2 presents the specific compositions of enamels and their properties.

T a

faces

-Properties

II II II G IV IV Temperature of softening, C 470 473 474 Fusibility at, 38 40 37 mm Weight loss, after 4 hours of boiling in caustic soda, kg / cm 0.16 0.20 0.22 Coefficient diffusion reflection 90 90 87 coverage%

table 2

Offer

Claims (1)

Known 72 472 475-480 44 45 28-32, 17 0.15 0.20-0.35 88 90 85-87 5 833616 The use of the proposed enamel will improve sanitation and hygiene {1e conditions-work during its melting due to the absence of composite materials fluorine, increase the alkali resistance, whiteness and dispersion of coatings. Claims of the invention enamel, including SiOa, A 1, .0a, .Ba05. , Kj, 0. TiO ,, PO / ZrOa, Pr Co 2.0, characterized in order to increase the alkali resistance, whiteness and spreadability, it contains these components in the following amounts, wt.%: No. 6 SiO 30-42 8-14 Pr 3 - 8 3-5 3-7, 5-4 16-23 T-iOa, 15-19 0.02-0.08. h Sources of information that are taken into account in the examination 1. USSR author's certificate. 687012, cl. From 03 to 7/04, 1978. 2, USSR Copyright Certificate 691425, cl. From 03 to 7/00, 1978.