Polymeric casting composition

FIELD: phenoplast production, in particular casting composition for technical applications.

SUBSTANCE: claimed casting composition included (mass %): novolac phenol-formaldehyde resin 47-49.3; wood powder 28.4-29.5; urotropine 7.1-7.4; kaolin 3.2-3.4; burnt magnesia 0.7-0.9; nigrosine 1.4-1.5; talk 3.7-3.9; naphthalene 1.9-2; stearin 0.2-0.4; calcium stearate 0.4-0.6; polyethylene wax 0.5-0.7; phosphoric acid triphenyl ester 1-5. Composition of present invention has increased destructive torque stress and decreased viscosity coefficient at 120°C and shear velocity gradient of 15 l/s.

EFFECT: composition with increased destructive torque stress and decreased viscosity coefficient.

4 ex, 1 tbl

 

The invention relates to the production of phenolic plastic, in particular molding compositions intended for the manufacture of General purpose.

Known polymeric molding composition containing a phenol-formaldehyde Novolac resin type with a content of free phenol of 0.1-4%, methenamine, wood flour, talc, kaolin, stearin, calcium stearate, naphthalene or caprolactam, lignin flour and caustic magnesite (USSR Author's certificate No. 1692998, CL 08 L 61/10, 23.11.91. Bulletin no.43).

The disadvantages of the known molding compositions are relatively high coefficient of viscosity (0,057-0,097)·105PA·and a relatively short time plastic-viscous state (94-154 )at a temperature of 120°and the gradient of shear rate 151/s, which does not provide the desired fluidity of the melt and allows you to get thin-walled molded parts of complex configuration. The disadvantage of this composition is also low bending stress at break (91,3-103,4 MPa).

The closest technological properties of a polymeric molding composition, which comprises a phenol-formaldehyde Novolac resin, wood flour, methenamine, kaolin, baked magnesia, nigrosine, talc, naphthalene and grease, as it contains glycerin slurry production of fat-ENT is th.

The disadvantages of the specified polymer molding compositions (USSR Author's certificate No. 1675306, CL 08 L 61/10, 07.09.91. Bull. No. 33) are relatively low bending stress at break (93,8-104,8) MPa and an increased coefficient of viscosity (0,029-0,057)·105PA·120°and the gradient of shear rate of 15 1/s, which limits the possibility of manufacturing high-quality thin-walled articles of complex configuration.

The technical result of the invention is to increase the bending stresses in polymer molding compositions and the reduction of the coefficient of viscosity at 120°and the gradient of shear rate of 15 1/s Technical result is achieved in that the polymer molding composition comprising a phenol-formaldehyde Novolac resin, wood flour, methenamine, kaolin, baked magnesia, nigrosine, talc, naphthalene and the lubricant additionally contains a polyethylene wax and thriftily ester of phosphoric acid in the following ratio, wt.%:

Phenol-formaldehyde Novolac resin 47-49,3

Wood flour 28,4-29,5

Methenamine of 7.1 to 7.4

Kaolin 3,2-3,4

Deadburned magnesia 0,7-0,9

Nigrosine 1,4-1,5

Talc 3,7-3,9

Naphthalene 1,9-2

Stearin 0,2-0,4

Calcium stearate 0,4-0,6

Polyethylene wax 0,5-0,7

Thriftily ether phosphoric acid 1-5

Example 1. 49,3 g fenolio maldehyde Novolac resin SF-010, of 29.5 g of wood flour, 7.2 g of methenamine, 3.3 grams of kaolin, 0.8 g of dead-burned magnesia, 1.5 g of nigrosine, 3.7 g of talc, 2 g of naphthalene, 0.4 g of stearin, 0.6 g of calcium stearate, 0.7 g of polyethylene wax PV-200 and 1 g thriftily ether phosphoric acid are loaded into the mixer, stirred for 40 min, the mixture was roll at 80-120 °C for 1.5 min, the resulting composition is ground. Samples are made by casting under pressure of 1200 kgf/cm, the extract is in the form within 90 C. mold Temperature 160-190°C.

The properties of the polymer molding compositions given in the table.

Examples 2-4 perform as described in example 1 with the difference that the components take in quantities specified in the table.

The table below shows the compositions and properties of the proposed polymer composition and prototype defined by standard methods. The table shows that the proposed compositions (examples 1-4) are 1.3-1.5 times higher bending stress at break, and at large times plastic-viscous condition, they have a lower 1.4-2.4 times the viscosity of the melt. The set of these properties provides high quality products of complex configuration.

The decrease in the content of the proposed additives listed below leads to the deterioration of the technological properties of the compositions, and the increase of the values specified above is s leads to a decrease of mechanical strength, what is undesirable.

0,015


Table

The composition and properties of compositions
IndicatorsExamplesThe placeholder
1234
1. Components, wt.%
Phenol-formaldehyde resin SF-0 10to 49.348,848,24749,5-a 50.5
Wood flour29,529,228,828,428,5 is 29.5
Methenamine7,27,47,37,17,0-7,8
Kaolin3,33,43,33,23-4
Deadburned magnesia0,80,80,90,70,4-1,2
Nigrosine1,51,41,41,51,1-2
Talc3,7the 3.8a 3.9the 3.8of 3.5-4.4
Naphthalene 21,91,921,4-2,6
Stearin0,40,30,30,2-
Calcium stearate0,60,50,50,4-
Polyethylene wax0,70,60,50,7-
Thriftily ether phosphoric acid11,935-
Sludge glycerin production of fat-and-oil enterprises0,6-3
2. Properties:
Bending stress at break, MPa138143,812912893,8-104,8
The length of plastic-viscous state at 120°and the gradient of shear rate of 15 1/s155160190200148-170
The coefficient of viscosity at 120°and the gradient of shear rate of 15 1/s *105PA*s0,0270,0250,0120,029-0,057

Thus, the proposed polymer composition has a 1.3-1.5 times higher bending stress at break and at large times plastic-viscous state has a lower 1.4-2.4 times the viscosity of the melt. This ensures high-quality thin-walled articles of complex shape by casting under pressure: excluded underfilling, marriage in appearance and emergency stop process due to premature curing of the material in the cylinder.

Polymer molding composition comprising a phenol-formaldehyde resin, wood flour, methenamine, kaolin, baked magnesia, nigrosine, talc, naphthalene and lubricant, characterized in that it further comprises a polyethylene wax and thriftily ester of phosphoric acid in the following ratio, wt.%:

Phenol-formaldehyde Novolac resin 47-49,3

Wood flour 28,4-29,5

Methenamine of 7.1 to 7.4

Kaolin 3,2-3,4

Deadburned magnesia 0,7-0,9

Nigrosine 1,4-1,5

Talc 3,7-3,9

Naphthalene 1,9-2

Stearin 0,2-0,4

Calcium stearate 0,4-0,6

Polyethylene wax 0,5-0,7

Thriftily ether phosphoric acid 1-5



 

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