SU1060100A3 - Process for producing bleaching agent based on sodium percarbonate - Google Patents

Abstract

Sodium percarbonate particles comprise a core of sodium percarborate coated with dehydrated sodium perborate (corresp. to formula NaBO2H2O2.3H2O). they are prepd. by moistening sodium percarbonate particles with water and coating with dehydrated sodium perborate. Sodium percarbonate is used as a bleaching agent alone or in washing compsns. It has the advantage of a higher active oxygen content and better solubility at 20 degrees C compared with sodium perborate. The prod. is relatively stable in a warm humid atmos. and at the same time preserves the rate at which it dissolved.

Description

This invention relates to the bleaching of bodies, in particular, to the method of producing sodium percarbonate-based bleach. A method is known for producing sodium percarbonate-based bleaching agent by applying liquid polyethylene glycol to particles of sodium percarbonate 1. However, the known method is characterized by insufficient stability of the obtained bleach, which is closest to the proposed technical essence and the achieved result is the method of producing sodium percarbonate based bleach by moistening part of sodium percarbonate with a hydrophobic liquid organic compound followed by applying to the moistened particles of the coating sodium percarbonate based 2j. The disadvantage of the conventional method is that the stability of the obtained bleach is not sufficiently satisfactory. The aim of the invention is to increase the stability of the resulting bleach. on the basis of sodium perborate, which consists in using sodium perborate of the formula MaVO, Н202- (0.15 0, 33) Ioo, obtained by drying shopping tetrahydrate product. Sodium silicate can also be applied to sodium percarbonate particles, which is done either by moistening the sodium percarbonate particles with an aqueous solution of sodium silicate before applying sodium perborate, or by moistening water with sodium percarbonate particles and then applying sodium perborate with sodium silicate. Water-wetted sodium percarbonate particles can also be coated with sodium perborate and sodium tripolyphosphate or soda ash and / or sodium percarbonate. The invention is illustrated by examples in which conditional abbreviations are used: No Pc g sodium percarbonate; CHOICE Sodium perborate. Example: In a rotating drum (250 mm, height 250 mm) having distances between each other, 4 exciting ribs 15 mm from each other, with a slope of 15 ° and a rotation speed of 30 obM., 1140 g of commercial sodium percarbonate is added. The coating is carried out as follows. In the first stage, 46 grams are sprayed into the first stage through a two-component nozzle. Then, 45 grams of the powdered sodium perborate of the formula MaO2 is added over 823. 0.15 HgO manually spatula. Then, four more additional stages, given in Table 1, are carried out. After the end of the last stage, the product is dried in a drying cabinet at 55 ° C for 30 minutes Data on the stability of the bleach are given in Table 1, 11, P E and me 2, Example 1 is repeated, with the difference that 1080 g of sodium percarbonate is coated in the manner described in Table 2 in 2. After the last stage, the product is dried in a drying cabinet at 55-bO ° C for 45 minutes. Data on the stability of the bleach are given in Table 11. 11. Prize, Repeat Example 1 with the difference that 960 g of sodium percarbonate is coated in the manner described in Table 3 in 3 ways. After the final stage, the product is dried in an oven at 55-60 ° C for 60 minutes. The data on the stability of the bleach are given in Table 11, Example 4, Example 1 is repeated, with the difference that sodium percarbonate contains 136 ml of a liquid glass solution (4.5 g of 36 Be liquid glass) and is covered as described in Table 4, after the final stage, the product is dried in an oven at 55-60 ° C for 60 minutes. Data on the stability of the bleach is given in Table 11, Example 5, Example 1 is repeated, with the difference that starting from stage number 4 /. Percarbonate of sodium is moistened with 138 ml of liquid glass solution (20.4 g of liquid glass 36 ° Be) or 15 ml of water, coated as described in Table 5. After the final stage, the product is dried in an oven at 55 ° C for 60 minutes. The data on the stability of the bleach is given in Table 11, Example 6, Example 1 is repeated with the same reason that sodium percarbonate is moistened with 130 ml of a water glass solution (40.8 g water glass, Zb ° Be) or 40 ml of water, cover: as described in Table 6. After the final stage, the product is dried in an oven at a BZ-C for 60 minutes. Data on the stability of the bleach are given in table 11, Example. Example 1 is repeated. With the difference that 745.5 g of percarbonate sodium is moistened with 210 ml of liquid glass solution (5.9 g of liquid glass, 36 ° Be) and coated homogeneously with a mixture of 316 g of anhydrous Nq. j50 and 120 g of sodium perborate of the formula Ma BO2 HjO 0.33 described in Table. 7, After the last stage: the product is dried in a drying cabinet at 55-60 ° C for 1 hour. The stability data of the bleach is given in Table. 11. Test 8. Repeat Example 7 with the goal that sodium percarbonate is moistened with 260 ml of liquid glass solution (81.6 g of water glass, 36 ° Be and covered with a homogeneous mixture consisting of 333 g of sodium tripolyphosphate and 120 g of sodium perborate as described in Table 8. After the end of the last stage, the product is dried in a drying cabinet with B-C for 1 hour, Data on the stability of the bleach is given in Table 11. and m. p. 9. Example 7 is repeated. This difference is that sodium percarbonate is moistened with 540 ml of liquid glass solution (168.5 g of water glass, 36 ° Be) and covering A homogeneous mixture consisting of 324 g of soda ash and 120 g of sodium perborate as described in Table 9. After the last stage, the product is dried in a drying cabinet at .55-60 ° C for 1 hour. Table 11 shows. 1 EXAMPLE 10 Example 7 is repeated with the difference that sodium percarbonate is moistened with 130 ml of water glass solution (36.2 g water glass) and coated with a homogeneous mixture consisting of from 60 g of NaPb and 180 g of Ma PC dust described in table. 10 way. After the end of the last stage, the product is dried in a drying cabinet at 55-60 ° C for 1 hour. Data on the stability of the bleach are given in Table. 11. Example 11. Example 1 is repeated, with the difference that sodium perborate of formula Noi 0.33 is used. Table 9 shows data on the bleaching stability. 11. Example12. Example 7 is repeated, with the difference that sodium perborate of the formula No BO -H Oi-O-fSWiQ is used. The stability of the bleach is given in Table. 11. Example 13. Example 1 is repeated, with the difference that sodium borate Na 802-H-gO O.ZHjO is used. Data on the stability of the bleach are given in table. 11. Example 14. Example 1 is repeated with the difference that the sodium percarbonate particles moisten 76 g of water, visible for 2 minutes, followed by applying 60 g of sodium dust perborate of the formula HaBO.j-H O-1-0 5 for 10 min. Data on the stability of the bleach are given in table. 11. Example 15. Example 1 is repeated with the difference that nepkapbsnat sodium particles moisten 76 g of water sprayed over 2 NMH, followed by applying 60 g of sodium dust perborate of the formula MaVO..OD HjO. Data on the stability of the bleach is given in Table 11. EXAMPLE 16 Example 5 with the difference that sodium percarbonate particles moisten 76 g of water sprinkled for 2 minutes followed by the application of 60 g of sodium dust perborate of formula N060 , 2 .. Data on the stability of the bleach are given in Table 11. Comparative example. Example 1 is repeated with the difference that sodium perborate of the formula NaeO.Hi.Oi 0.1 is used. Data on the stability of the bleach are given in table. 11. Comparative example II. Example 11c is repeated, with the difference that sodium perborate of formulas NQ60.2 "202 0.35 is used. Data on the stability of the bleach are given in table. 11. Comparative Example 111. Example 14 is repeated, with the difference that forbolob sodium perborate MaBOj-HjOi-0.1 is used. These bleach stability data are given in Table. 11. Comparative example IV. Example 16 is repeated, with the difference that sodium perborate of formula No gOj is used. . 0.35. . Data on the stability of bleach i are given in table. 11. The stability of the bleaches of Examples 1-16, Comparative Examples 1 through IV, and the known bleaches L and B are determined as follows. the samples are fed to a desiccator (diameter 150 mm, height 150 mm), in which there are 670 mg of 10.56% sulfuric acid, and kept in a nicutor at 30 ° C for 4 days (experiment l), 7 days (experiment B) and 10 4ne (experience C). Due to the content: in a desiccator, sulfuric acid will achieve a relative air humidity of 96%. After completing the test, each sample is enlarged for the percentage loss of active oxygen. The data obtained in this case are summarized in Table. eleven.

Table 1

12

ten

3 4

. .five

38

18

17

17

20

ten

1 2 3

33

38

20

21

ten

table 2

54 27 35

528 20 28

sixteen

T a b l and c a 3

39

37

20

23

22

29

23

Adding

Stage, RRT, r number

45 17

17 19

15

1 Continued table. 3

20

36

20

37

20

36

6. 6

20

36

Table4

Add time

e

min

72 38

38

30, 38

30 36 30 30

15

12

sixteen

28

12

sixteen

sixteen

17

15

22

17

17

Tabl5

50 30 50

45

thirty

65

(water)

60

Table

76 54 62

41 30 35

6

sixteen

41

33 30 35

(water)

(.water)

Adding mixture and anhydrous

1 2 3 4 5 6

7 8

j

9

10 11 12 13

Adding a mixture of IAR and tripolyphosphate

one

 2 3

4 5 6 7 8 9

10 11 12

Table 7

Adding solution

KARA liquid glass ml

.r

thirty

59

thirty

86

thirty

77

thirty

63

40

96

40

55

ten

Tables a8

Adding liquid glass, ml of sodium, g

thirty

50

50

50

50

thirty

13

1060100

14 Table 9

15

1060100

sixteen ,

Table 10

Comparative examples serve to confirm the significance of the use of sodium perborate of the above formula.

XX Known bleach according to the above analogue, obtained by coating sodium percarbonate particles with liquid polyethylene glycol and then drying at 55 ° C for 30 minutes.

 A known bleach according to the above prototype, obtained by wetting the sodium percarbonate particles with dioctyl phthalate and applying sodium perborate as a tetrahydrate onto the wet sodium percarbonate particles, followed by drying at 55-60 ° C for 1 hour.

Continued table. eleven

Claims (1)

METHOD FOR PRODUCING BLEACH ON THE BASIS OF SODIUM PERCARBONATE by moistening particles of sodium percarbonate and then applying to the moistened particles a coating based on sodium perborate, characterized in that, in order to increase the stability of the bleach obtained, sodium perborate of the formula ΝαВOj <Н ₂ О _{2 is used} . (0.15-0.33) N _g O.