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Outcome analysis

The results of the study of the main technological 

properties of the modified glue are given in (table 1).

Table 1. – Basic technological properties of modified glue

Percentage of 

modifier,%

The surface tension 

of the glue, mN/m

Wetting 

angle, grad.

Viscosity according to 

ВЗ-246 with a nozzle 

diameter of 4 mm, с

pH

Gelatinization 

time, 150 °C, с

0

66

68

74

7.93

60

1

57

64

77

7.59

57

2

55

61

80

7.48

53

3

53

58

85

7.39

50

4

52

55

91

7.31

47

5

51

54

98

7.25

45

6

50

55

105

7.20

44

As can be seen from Table 1, the technological 

properties of the removable adhesive vary depending 

on the amount of modifier.

The physical and mechanical properties of the 

plates obtained on the basis of modified glue are 

given in (table 2).

Table 2. – Physical and mechanical properties of the obtained plates

Percentage of 

modifier in glue 

composition,%

Static crush 

resistance, 

MPa

Resistance to 

perpendicular 

stress, MPa

Swelling 

in thick-

ness,%

Bulk 

swell,%

Water absorption,%.

0

10.5

0.22

32.6

32.49

78.6

1

12.3

0.29

28.2

26.42

72.4

2

13.5

0.34

25.3

25.63

64.7

3

15.1

0.39

22.0

24.88

58.3

4

16.8

0.43

19.9

23.56

52.8

5

18.0

0.48

16.7

22.91

49.0

6

18.5

0.50

16.1

21.96

48.1

As can be seen from (table 2), its physical and 

mechanical properties are optimal when the amount 

of modifier is 5% of the glue mass.

Figure 1. shows the dependence of the mass loss 

(%) of the obtained slab samples on the amount of 

modifier in the “Fire Pipe” for 3 minutes.

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Section 7. Chemistry

40

Figure 1. Dependence of the mass loss (%) 

on the amount of modifier in the “Flame tube” 

for 3 minutes of the obtained slab samples

Figure 2. Dependence of the time 

spent on 30% mass loss in the “fire 

pipe” on the amount of modifier

Figure 2. shows the dependence of the time taken 

for the 30% mass loss in the “fire pipe” on the amount 

of modifier.

As can be seen from (figure 1), the combustion 

mass loss of the plate has the lowest value (12%) 

when the modifier content is 5%. When the amount 

of modifier is higher than this, the mass loss rate in 

combustion is almost unchanged.

From (figure 2) it can be seen that it took 15 min-

utes for 30% mass loss when the modifier amount 

was 5%. There was no significant difference when 

the modifier content was 6%. It was proved that the 

optimal amount of the modifier is 5%.

Conclusion

The results show that the new type of glue 

modified with sodium silicate and silicon-organic 

compounds in many respects does not lag behind 

phenol-formaldehyde and urea-formaldehyde res-

ins. Wood panels based on it are resistant to fire and 

moisture, and their strength is not inferior to other 

similar types of boards.

The amount of modifier based on the obtained 

silicon-organic compound was found to have a sig-

nificant effect on the strength of the product. As the 

amount of modifier increases, water resistance and 

durability increase. It was found that 5% modifier 

was the most acceptable amount relative to the to-

tal mass of glue, and that the strength and water re-

sistance of the resulting product changed very little 

when the percentage was higher.

Based on the results of the study, it can be said that 

the use of modified adhesives based on organosilicon 

compounds for the production of environmentally 

safe wood shavings will lead to a major change in the 

industry. This will reduce the use of toxic substances 

in the production of wood chipboard.

References:

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M.: Scientific world, 2004. – 520 p.

2.  Azarov V. I. Chemistry of wood and synthetic polymers: textbook / V. I. Azarov, A. V. Burov, A. V. Obo-

lenskaya. – SPb.: Lan, 2010. – 624 p.

3.  Sokolova E. G. “Modification of phenol-formaldehyde resin with melamine-urea-formaldehyde resin for 

gluing plywood” Systems Methods Technologies 2018. – No. 2 (38). – P. 111–115.

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9.  Fedotov A. A. Investigation of the properties of chipboards based on synthetic resins with various pro-

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