Composition for cellulose-bearing materials surface treatment (versions)

FIELD: textile fabrics, paper.

SUBSTANCE: composition concern pulp and paper industry and is intended for cellulose-bearing materials surface treatment. The first composition includes modified carbamide - formaldehyde oligomer and in the capacity of modifier is sodium salt of carboxymethyl cellulose. The second composition contains mentioned above components and melamine. The third composition contains components of the first composition and cationic starch.

EFFECT: improving of composition and strength properties of cellulose-bearing materials.

3 cl, 3 tbl, 12 ex

 

The invention relates to the pulp and paper industry and can be used to obtain the composition for surface treatment of cellulose-containing materials with the purpose of strengthening and making them superior properties: high wet strength, tensile strength and other.

Known composition for the surface treatment of cellulose-containing materials, including urea-formaldehyde oligomer-modified melamine (see Temkina R.Z., Forestry, 1970, str-228).

A disadvantage of the known solutions are: the heterogeneity of the composition, which creates difficulties when applying adhesives to the surface of cellulose-containing materials; very low viscosity, low viability.

Known composition for the surface treatment of cellulose-containing materials, including urea-formaldehyde oligomer-modified phenol (see Temkina R.Z., Forestry, 1970, str-239).

A disadvantage of the known solutions are: dark brown color, high viscosity, excessive alkalinity, instability during storage.

The closest in technical essence is a composition for surface treatment of cellulose-containing materials, including urea-formaldehyde oligomer modified technical lignosulphonate (see Pat the t of the Russian Federation No. 2021413, CL D21 21/16, 1991).

The disadvantages of the known solutions are: brown, low gelling time and vitality, low blagorodnost and breaking length of the treated paper.

The problem solved by this invention is to obtain a modified urea-formaldehyde oligomers white or light yellow color with a good time gelatinization and viability and in obtaining cellulose-containing materials with improved strength properties.

This technical result is achieved in that the composition for surface treatment of cellulose-containing materials, including the modified urea-formaldehyde oligomer, in the first performance as a modifier contains the sodium salt of carboxymethyl cellulose in the following ratio, wt.%:

Urea-formaldehyde oligomer92-98
Sodium salt of carboxymethylcellulose2-8

In another execution of the technical result is achieved in that the composition for surface treatment of cellulose-containing materials, including the modified urea-formaldehyde oligomer, as a modifier contains sodium carboxymethyl cellulose and cationic starch presleduyumie ratio of components wt.%:

Urea-formaldehyde oligomer88,8-94,5
Sodium salt of carboxymethylcellulose2-8
Cationic starch3,2-3,5

In the third execution of the technical result is also achieved by the fact that the composition for surface treatment of cellulose-containing materials, including the modified urea-formaldehyde oligomer, as a modifier contains sodium carboxymethyl cellulose and melamine in the following ratio, wt.%:

Urea-formaldehyde oligomer79,5-85,4
Sodium salt of carboxymethylcellulose2,4-9
Melamineof 11.5 to 12.2

The invention in the first embodiment illustrated by the following examples.

Example 1. In a reaction flask equipped with a mechanical stirrer with a hydraulic valve and a thermometer, download urea (the main download) To 1-10 g and MCMC (2%solution) - 0.55 g (27.5 ml) (2% by weight of dry. prophetic-VA). Include a stirrer and a heating water bath. After complete dissolution of the urea at a temperature of 40-50°With the pH of the mixture should be a 7.5. Enter the required number of formalin (pH 6) (formalde the IDA) - 30 g (12 g), previously neutralized with caustic soda solution (NaOH 10%) until a pH of 8.5, and 9.0. the pH of the mixture should be equal to 8.5. If necessary, increase the pH by adding dropwise a solution of alkali. Continue heating until 62-65°C and maintained for some time. The second stage is carried out in weakly acidic or neutral environment. For this purpose, the pH of the mixture to reduce the ammonium chloride solution to pH 6.5-7.0 and incubated at 62-65°C, stirring for some time. Then bring the pH to 8.5, and 9.0 by adding dropwise sodium hydroxide, stopping stirring. Injected urea (additional) K2 - 5, the Reaction system is maintained at 60-65°and operating the mixer for some time. The obtained oligomer concentrated by evaporation in a fume hood in a porcelain Cup and with careful stirring. The concentrated oligomer is cooled to 25-30°C. the Amount of urea-formaldehyde oligomer 98%, sodium salt of carboxymethylcellulose 2%. The properties of the oligomer are shown in table 1.

Example 2. Carried out according to the method described in example 1 but using the following downloads reagents: formalin (37%) (formaldehyde) - 30 g (12 g), urea (the main download) C1 - 10 g; urea (additional) K2 - 5 g; Na (2%solution) - 1,125 g (56,25 ml) (4% by weight of dry. prophetic-VA). The number karbamidformal legalnogo oligomer 96%, sodium salt of carboxymethyl cellulose 4%. The properties of the oligomer are shown in table 1.

Example 3. Carried out according to the method described in example 1 but using the following downloads reagents: formalin (37%) (formaldehyde) - 30 g (12 g), urea (the main download) C1 - 10 g; urea (additional) K2 - 5 g; Na (2%solution) - 1,725 g (86,25 ml) (6% by weight dry. prophetic-VA). The amount of urea-formaldehyde oligomer 94%, sodium salt of carboxymethyl cellulose 6%. The properties of the oligomer are shown in table 1.

Example 4. Carried out according to the method described in example 1 but using the following downloads reagents: formalin (37%) (formaldehyde) - 30 g (12 g), urea (the main download) C1 - 10 g; urea (additional) K2 - 5 g; Na (2%solution) to 2.35 g (117,5 ml) (8% by weight of dry. prophetic-VA). The amount of urea-formaldehyde oligomer 92%, sodium salt of carboxymethyl cellulose 8%. The properties of the oligomer are shown in table 1.

The invention according to the second variant is illustrated by the following examples.

Example 5. In a reaction flask equipped with a mechanical stirrer with a hydraulic valve and a thermometer, download urea (main load) : 1 - 10 g, melamine - 5 g and Na (2%solution) 1 - g (50 ml) (2.4% of the dry mass. prophetic-VA). Include a stirrer and a heating water bath. After complete dissolution of the urea at a temperature of 40-50°NRC mixture should be a 7.5. Enter the required number of formalin (pH 6) (formaldehyde) - 50 grams (20 g), previously neutralized with caustic soda solution (NaOH 10%) until a pH of 8.5, and 9.0. the pH of the mixture should be equal to 8.5. If necessary, increase the pH by adding dropwise a solution of alkali. Continue heating until 62-65°C and maintained for some time. The second stage is carried out in weakly acidic or neutral environment. For this purpose, the pH of the mixture to reduce the ammonium chloride solution to pH 6.5-7.0 and incubated at 62-65°C, stirring for some time. Then bring the pH to 8.5 -9,0, adding dropwise sodium hydroxide, stopping stirring. Injected urea (additional) K2 - 5, the Reaction system is maintained at 60-65°and operating the mixer for some time. The obtained oligomer concentrated by evaporation in a fume hood in a porcelain Cup and with careful stirring. The concentrated oligomer is cooled to 25-30°C. the Amount of urea-formaldehyde oligomer of 85.4%, sodium salt of carboxymethyl cellulose of 2.4%, melamine 12,2%. The properties of the oligomer are shown in table 2.

Example 6. Carried out according to the method described in example 5, but using the following downloads reagents: formalin (37%) (formaldehyde) - 50 grams (20 g), urea (the main download) C1 - 10 g; urea (additional) K2 - 5 g; m is Lamin - 5 g; Na (2%solution) to 2 grams (100 ml) (4.8% of dry mass. prophetic-VA). The amount of urea-formaldehyde oligomer of 83.3%, a sodium salt of carboxymethyl cellulose is 4.8%, melamine 11.9 percent. The properties of the oligomer are shown in table 2.

Example 7. Carried out according to the method described in example 5, but using the following downloads reagents: formalin (37%) (formaldehyde) - 50 grams (20 g), urea (the main download) C1 - 10 g; urea (additional) K2 - 5 g; melamine - 5 g; Na (2%solution) 3 g (100 ml) (7,0% by weight of dry. prophetic-VA). The amount of urea-formaldehyde oligomer 81.4 per cent, sodium salt of carboxymethyl cellulose and 7%, melamine of 11.6%. The properties of the oligomer are shown in table 2.

Example 8. Carried out according to the method described in example 5, but using the following downloads reagents: formalin (37%) (formaldehyde) - 50 grams (20 g), urea (the main download) C1 - 10 g; urea (additional) K2 - 5 g; melamine - 5 g; Na (2%solution) - 4 g (200 ml) (9,1% by weight of dry. prophetic-VA). The amount of urea-formaldehyde oligomer of 79.6%, sodium salt of carboxymethyl cellulose 9%, melamine 11.4 percent. The properties of the oligomer are shown in table 2.

The invention according to the third variant is illustrated by the following examples.

Example 9. In a reaction flask equipped with a mechanical stirrer with a hydraulic valve and a thermometer, download urea (the main download) - 10 g starch (2%solution) 1 - g (50 ml) and Na (2%solution) - 0.56 g (28 ml) (2% by weight of dry. prophetic-VA). Include a stirrer and a heating water bath. After complete dissolution of the urea at a temperature of 40-50°With the pH of the mixture should be a 7.5. Enter the required number of formalin (pH 6) (formaldehyde) - 30 g (12 g), previously neutralized with caustic soda solution (NaOH 10%) until a pH of 8.5, and 9.0. the pH of the mixture should be equal to 8.5. If necessary, increase the pH by adding dropwise a solution of alkali. Continue heating until 62-65°C and maintained for some time. The second stage is carried out in weakly acidic or neutral environment. For this purpose, the pH of the mixture to reduce the ammonium chloride solution to pH 6.5-7.0 and incubated at 62-65°C, stirring for some time. Then bring the pH to 8.5, and 9.0 by adding dropwise sodium hydroxide, stopping stirring. Injected urea (additional) K2 - 5, the Reaction system is maintained at 60-65°and operating the mixer for some time. The obtained oligomer concentrated by evaporation in a fume hood in a porcelain Cup and with careful stirring. The concentrated oligomer is cooled to 25-30°C. the Amount of urea-formaldehyde oligomer 94.5%of the sodium salt of carboxymethylcellulose 2%, of cationic starch to 3.5%. The properties of the oligomer are shown in table 3.

the example 10. Carried out by the method shown in example 9, but using the following downloads reagents: formalin (37%) (formaldehyde) - 30 g (12 g), urea (the main download) C1 - 10 g; urea (additional) K2 - 5 g; starch (2%solution) 1 - g (50 ml), Na (2%solution) - 1,15 g (57,5 ml) (4% by weight of dry. prophetic-VA). The amount of urea-formaldehyde oligomer 92.7%, the sodium salt of carboxymethyl cellulose 4%, cationic starch of 3.4%. The properties of the oligomer are shown in table 3.

Example 11. Carried out by the method shown in example 9, but using the following downloads reagents: formalin (37%) (formaldehyde) - 30 g (12 g), urea (the main download) C1 - 10 g; urea (additional) K2 - 5 g; starch (2%solution) 1 - g (50 ml), Na (2%solution) - 1,75 g (87,5 ml) (6% by weight dry. prophetic-VA). The amount of urea-formaldehyde oligomer 90.7 percent, sodium salt of carboxymethyl cellulose 6%, cationic starch of 3.3%. The properties of the oligomer are shown in table 3.

Example 12. Carried out according to the method described in example 7, but using the following downloads reagents: formalin (37%) (formaldehyde) - 30 g (12 g), urea (the main download) C1 - 10 g; urea (additional) K2 - 5 g; starch (2%solution) 1 - g (50 ml), Na (2%solution) and 2.4 g (120 ml) (8% by weight of dry. prophetic-VA). The amount of urea-formaldehyde oligomer and 88.8%, three-the howling salt of carboxymethyl cellulose 8%, cationic starch is 3.2%. The properties of the oligomer are shown in table 3.

Were also conducted tests of the modified urea-formaldehyde resin on the nearest equivalent. Was prepared with the composition of the urea-formaldehyde resin modified technical lignosulphonate, in conditions similar to examples 1-12. Composition: urea-formaldehyde resin - 92 parts by weight; technical lignosulphonate - 8 parts by weight of

Properties of the obtained composition:

Gelling time at 100°With 1% NH4Cl50
Pot-life at 20°With 1% NH4Cl, hthe 4.7

Properties of the treated paper

Breaking length, m3300
Blagorodnost, %37,6

Table 1
Properties of the modified urea-formaldehyde oligomers
IndexThe oligomer from example
1234
A sizing composition, parts by weight (wt.%)
- urea-formaldehyde oligomer27 (98%)27 (96%)27 (94%)27 (92%)
- the sodium salt of carboxymethylcellulose0,55 (2%)1,125 (4%)1,725 (6%)2,35 (8%)
Gelling time at 100°C C 1% NH4Cl, c83797670
Pot-life at 20°With 1% NH4Cl, h, not less thana 7.92of 7.757,5687,5
Properties of the treated paper
- Breaking length, m4650425036003300
- Blagorodnost, %53,049,845,841,0

Table 2
Properties of the modified urea-formaldehyde oligomers
IndexThe oligomer from example
5678
- urea353535 (81.4 per cent)35
oligomer(85,4%)(72,3%)(79,5%)
- the sodium salt of carboxyl-3 (7%)
etilzellulozy1 (2,4%)2 (4,8%)4 (9%)
melamine5 (11,6%)
5 (12,2%)5 (11,9%)5 (11,4%)
Gelling time at 100°C C 1% NH4Cl, c63625956
Pot-life at 20°With 1% NH4Cl, h, not less than6,33of 5.92of 5.835,78
Properties of the treated paper
- Breaking length, m4700480043004250
- Blagorodnost, %58,060,42,4 49,6

Table 3
Properties of the modified urea-formaldehyde oligomers
IndexThe oligomer from example
9101112
A sizing composition, parts by weight (wt.%)
- urea-formaldehyde oligomer27 (94,5%)27 (92,7%)27 (90,7%)27 (88,8%)
- the sodium salt of carboxymethylcellulose1,75(6%)
0,57 (2%)1,15 (4%)2,4 (8%)
cationic starch1 (3,5%)1 (3,43%)1 (3,36%)1 (3,28%)
Gelling time at 100°C C 1% NH4Cl, c70666258
Pot-life at 20°With 1% NH4Cl, h, not less than1110,59,839
Properties of the treated paper
- Breaking length, m3350345038504200
- Blagorodnost, %55,852,144.3a 38.5

Thus, the invention can positively influence the properties of the treated cellulosic materials: increases blagorodnost, reduced deformation in the transverse direction when wet, with a significant improvement of the breaking length, smoothness and degree of sizing.

1. The composition for surface treatment of cellulose-containing materials, including the modified urea-formaldehyde oligomer, characterized in that as a modifier, it contains the sodium salt of carboxymethyl cellulose in the following ratio, wt.%:

Urea-formaldehyde oligomer92-98
Sodium salt of carboxymethylcellulose2-8

2. The composition for surface treatment of cellulose-containing materials, including the modified urea-formaldehyde oligomer, characterized in that as a modifier, it contains sodium carboxymethyl cellulose and cationic starch with the following sootnoshenie the components, wt.%:

Urea-formaldehyde oligomer88,8-94,5
Sodium salt of carboxymethylcellulose2-8
Cationic starch3,2-3,5

3. The composition for surface treatment of cellulose-containing materials, including the modified urea-formaldehyde oligomer, characterized in that as a modifier, it contains sodium carboxymethyl cellulose and melamine in the following ratio, wt.%:

Urea-formaldehyde oligomer79,5-85,4
Sodium salt of carboxymethylcellulose2,4-9
Melamineof 11.5 to 12.2



 

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