SU1735533A1 - Method of manufacturing rod for reinforcing concrete - Google Patents

Abstract

Use: the field of production of building materials, including reinforcing elements for concrete structures. SUMMARY OF THE INVENTION: Basalt roving is thermally treated in a firing chamber at 150-200 ° C, impregnated with a polymer binder in a closed vacuum cup. The invention relates to construction, in particular, to reinforcing elements for concrete structures, and can be used for reinforcing supporting composite concrete structures . The purpose of the invention is to simplify the method and increase the alkali resistance of the rod. For the manufacture of a reinforcing bar, basalt roving of mark RB 9-330 is used (basalt roving with an elementary fiber diameter of 9 µm and a nominal density of 400 tex); the lubricant, pa30-50 ° C, forms the transverse profile of the rod by drawing the roving impregnated with the binder through a squeezing device and a die plate installed at the outlet of the impregnation bath, and then through the second and third dies installed after the first heat chamber before and after braiding device. The speed of pulling the rod for reinforcement of concrete is maintained within the range of 0.0048-0.0052 m / s, and the residence time in the area of prelimization is 1385-1500 s. Curing of the rod for reinforcement is carried out in heat chambers in the mode of stepwise temperature rise and cooling, & C: I-75-85; And 110-120; 111 - 123-132; IV - 135-140; V - 145-150; VI - 140-147; VII - 90-105; VIII - 20-30. The ratio of components in the manufacture of the rod, mac.ch .: basalt roving 40,5-69,2; epoxy resin Dianova 9.5-10.5; isomethyl tetraphthalic anhydride 4.7-5.2; VAT residue of toluene diisocyanate 1.8-2.3; 2,4,6-tris- (dimethylamino) methylphenol (alpha, alpha, alpha) -tris- (dimethylamino) metizol 0.018-0.021. 2 tab. raffin emulsion, epoxy resin Dianova viscosity 5-18 Pa s. Roving is obtained from basalt of the Rivne region composition, wt.%: SiOa 48.2 - 49.55; TiO2 0.96 - 1.79; A120Z 14.35 - 16.43; RESOS 5.25-5.96; FeO 5.60 - 6.77; CaO 8.91-11.10; MDO 7.33 - 9.07; MPO 0.17 - 0.29; Na20 1.84 - 2.74; K20 0.45 - 1.26; ZOZ 0.02-0.05; P20s 0.25-0.35; SPT 1.15-2.90. Epoxy resins are derived from diphenylol propane and epichlorohydrin. Dianova Epoxy Resin has the following chemical formula CO with VI Conjured CJ 00

Description

CHrCHCHi

15

Technical name of the product - resin ED-16.

Isomethyltetrahydrophthalic anhydride has the following chemical formula: 20

gp

friu / 1 and

The bottoms of toluoyanediisocyanate is a high molecular weight product of the conversion of toluene diisocyanate (TDI). Formed in the production of 2,4,6-toluene diisocyanate at the stage of distillation of TDI in the amount of 0.13 tons per 1 ton of TDI.

Chemical formula 2,4 - 2,6 TDI:

SI,

MW-SuXO

2.4 isomer 2.6 isomer

65 ± 2 weight. % 35 ± 2 weight.%.

At the time of formation, the bottom residue of the TDI is a resinous substance, after solidification it is easily crushed in ball mills to a predetermined fineness.

The composition of the cubic residue wt.%: TDI - n / b 5; C - 65.5; H - 4.6; N 5.4; 02 - 23.5; CI-0.95.

2,4,6-tris- (dimethylamino) methylphenol (alpha, alpha, alpha) -tris- (dimethyl min-) metizol of the chemical formula CisH27CN3 has the following structural formula:

HE

QEDde-GBTWDCoi

Y

SNGZHSNz)

0

five

0

five

0

five

0

five

0

five

The technical name of the substance - accelerator UP-606/2.

The basalt roving is preliminarily heat treated at 150-200 ° C in the firing chamber, followed by passing through eight heat chambers after coating with a binder in an impregnating bath.

The basalt roving is impregnated with a polymeric binder in a closed bath at 30-50 ° C.

The transverse profile of the rod is formed by pulling the binder-impregnated roving through the squeezing device and the spinneret installed at the outlet of the impregnation bath, and then through the second and third spinnerets installed after the first heat chamber before and after the braiding device.

The speed of pulling the rod for reinforcing concrete is maintained within the range of 0.0048 - 0.0052 m / s for 1385 - 1500 s.

Curing of the rod for reinforcement is carried out in heat chambers in the mode of stepwise temperature rise and cooling, ° C: I-75-85; II- 110-120; III-123-132; IV- 135-140; V- 145-150; VI- 140-147; VII - 90 - 105; VIII - 20 - 30.

Ratio of the components of the binder, ma.ch .;

Basalt roving 40,5-69,2

ED-169.5-10.5 epoxy resin

Isomethyltetraphthalic anhydride4,7-5,2

VAT residue toluylene diisocyanag1, 8-2,3

The accelerator UP-606/2 0,018-0,021

This ratio is chosen on the basis of 70-80 wt.% Of a filler (basalt roving), the rest is a binder. The amount of filler can be varied depending on the requirements for the valves and the conditions of its operation.

The ratio of the components of the binder is determined by the number of interacting epoxy, hydroxyl and amine groups in the resin, hardener and accelerator, as well as the temperature conditions and time of the curing process of the binder in the rebar,

Example 1. Reels with roving of basalt threads set on the shelf. To obtain a rod diameter of 5-6 mm and a degree of filling of at least 40-50%, the number of reels should be 113-116 pcs. depending on the thickness of the individual threads. The roving is tensioned and passed at a rate of 0.0048 m / s through the firing chamber at 150 ° С, where the partial removal of paraffinic sizing occurs. 2.5 kg of binder, including 1.482 kg of ED-16 epoxy resin, 0.733 kg of isomethyltetrahydrophthalic anhydride, 0.281 kg of vat residue of toluene diisocyanate and 0.003 kg of UP-606/2 accelerator, are thoroughly mixed into the impregnating bath, thoroughly mixed until the components are evenly distributed. at 30 ° C. The basalt roving is passed through a heated bath, while the uniform distribution of the binder between the roving is monitored. At the exit from the bath, the threads are passed through a squeezing device, where part of the binder is removed and returned to the impregnation bath through the tray. Next, the impregnated binder yarns are directed through the die to the first heat chamber, where the temperature is maintained at 75 ° C. After the first heat chamber, the rod is passed through the die plate, the braiding device and again through the die plate. The braid is made with a basalt thread with a braiding pitch of 2 mm. The tension of the braided thread is adjusted with the expectation of excluding the rod and ensuring its specified size. In the second and third spinnerets, the residual excess binder is removed and the rod is drawn through the second to eighth heat chambers, maintaining the respective temperature in each, ° C: II - 110; III - 123; IV - 135; V - 145; VI - 140; VII - 90; VIII-20.

The residence time of the rod in the heating zone is 1500 s.

The characteristics of the physical and chemical properties of the reinforcing bar obtained from the three measurements are the following: rod diameter 6.5 mm; density 1,457 g / cm3; binder amount 53.9%; degree of polymerization 91.46%; the amount of filler (basalt roving) is 46.1%; water absorption at room temperature after 1 day 0.59, after 2 months. 2.23%; water absorption at 100 ° C after 1 h 0.67%; after 6 h, 1.30%; tensile strength of 4965 kgf / cm.

The effect of deviations from the optimal production of basalt plastic rods is given in Table. one.

As can be seen from the data given in table. 1, the selected composition of the rod and the method of its production provide the best technical characteristics.

strength, density, etc. Changes in individual process parameters beyond the limits of the process result in poor performance.

The properties of the rod and the ratio of components in their manufacture are given in table. 2. The manufacturing parameters are given for Example 1 described above.

For example 2, the pass rate

is 0.0050 m / s for 1420 s, the temperature in the chambers is 80, 115, 128, 137, 143, 98, 25 ° C, respectively.

In example 3, the upper values of the parameters of the methods are used.

Alkali resistance in 1 n. solution a HE is compared with the known method.

As follows from the test results, the implementation of the proposed method allows its simplification (elimination of the solvent stripping stage) to increase the resistance of the rebar to alkaline solutions.

Claims (1)

Invention Formula A method of manufacturing a rod for reinforcing concrete, which includes heat treatment of basalt roving at 150–200 ° C, impregnating it in a closed bath with an epoxy resin composition at 30–50 ° C, forming a profile through a squeezing device and a spinneret installed after the impregnation bath, and also through two additional dies and a braiding device, curing the rod by passing it through eight heat chambers at a speed of 0.0048–0.0052 m / s for 1385–1500 s, which, in order to simplify the process and increase alkali test ykosti rod 40.5-69.2 ma.ch. basalt roving is impregnated with the composition in mac.h .: epoxy-dianova resin with a viscosity of 5–18 Pa — s — 9.5-10.5; isomethyltetrahydrophthalic anhydride - 4.7-5.2; vat the residue of toluene diisocyanate is 1.8-2.3; 2,4,6-tris- (dimethylamino) methylphenol (alpha, alpha, alpha) -tris- (dimethylamino) metizol - 0.018-0.021, additional dies are installed after the first heat chamber before and after the braiding device, and the temperature is set according to heat chambers in series, degrees: 75-85; 110-120; 123-132; 135-140; 145-150; 140-147; 90-105: 20-30. Table 1 4500 4700 4920 4600 49,8 53.5 52.9 , 35 6.0 88.7 Disrupted profile rod Poor wetting of the thread Bad spin binder Premature polymerization; bad spin Slow polymerization, lack of binder Slow polymerization rate 1.40 6.4 91.3 Economically impractical 1.41 6.5 89.8 Violation of physical and mechanical properties table 2 -6,153,991, 965 +2 39 + 3 ° + M9 „5 75М91.J.6 W -1.39 +2.05 +2.87 +3.65 , 292.11 523 + 10.97 + 1.75 + 2.35 +3.25 2 Continued table. 2