SU1447665A1 - Method of applying binder on mineral fibres - Google Patents

Description

(21) 4174488 / 29-33

(22) 01/05/87

(46) 12/30/88. Bul Number 48

(71) All-Union Scientific Research Institute of Thermal Insulation and Acoustic Building Materials and Products VNIIteploizol tsi

and the Institute of Applied Physics of the Academy of Sciences of the MSSR

(72) F.E. Calm, K.K.-K. Eiduk-ichus, Yu.M., Bogdanov and I.Yu.N. Spiders

(53) 662.998.3 (088.8)

(56) USSR Author's Certificate No. 1224284, cl. From 03 to 37/06, 1986.

Handbook for the production of thermal insulation materials. Ed. Yu.L. Spirin. M .: Stroyizdat, 1975, p. 159.

(54) METHOD OF NMCONCEMENT BINDING ON MINERAL FIBERS

(57) The invention relates to the production of heat insulating building materials and can be used in the manufacture of mineral-bonded plates on a synthetic binder, with the aim of improving the strength characteristics of products and reducing binder consumption by increasing the uniformity of the binder distribution on the surface of the fibers. their simultaneous partial orientation according to the method of applying the binder to the mineral fibers, such as creating jets of aerosol binder and directing them to the flare of the bulge When creating aerosol jets, a pulsating supply of jets of aerosol binder with a frequency of 10–30 kHz is carried out, while pulsating jets of aerosol are directed into the plume at an angle of 20–50 to its axis. With a volume mass of iOO kg / m, the binder content is 2.6–3.1%, the compressibility of the plates with a load of 0.02 kgf / cm is 4.7–6.3%. Il., 1 tabl, S

a ss

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The invention relates to the production of heat insulating building materials and can be used in the manufacture of products based on mineral fiber and a binder.

The purpose of the invention is to increase the strength characteristics of products and to baptize the binder consumption by increasing the uniformity of the distribution of the binder on the surface of the fibers with their simultaneous partial orientation.

The drawing shows a binder application device installed in the chamber and precipitated with mineral fibers.

The device includes acoustic bridges of a solution of a binder with acoustic resonators 2, which ensure the generation of pulsations in a given frequency range and the formation of jets 3 of a binder aerosol, and pipelines 4 and 5 of the supply of compressed air and a binder solution, respectively. The aerosol jets 3 are directed by 3 plumes 6 of the blowing of the fiber, formed from silicate melt 7 by means of the fiber-forming unit 8.

Method 5 is carried out as follows.

From the mineral melt 7 with the help of the fiber-forming unit 8, a torch 6 of a double fiber is formed. The binder and into the air are fed through pipelines 4 and 5 to the atomizer m 1. Air flows out of the nozzle of atomizer 1 at supersonic speed, flows onto resonator 2 and generates pulsations (creates an acoustic field). Binder spray 1 is fed into the zone of generation of pulsations, where under the action of a pulsating stream of air turns into an aerosol, the jet 3 of which is directed into the flare 6 of the blowing fiber. The application of the binder in the field of pulsations of the acoustic frequency leads to an increase in the degree of dispersion of the binder — the average diameter of the droplets in the aerosol jet is reduced to 10–15 µm with high monodispersity droplets. At the same time, the root angle of the flare is increased to 100-140, i.e. a wide aerosol is formed with a uniform field at the end of the Tradia over the jet section. In addition, it intensifies

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wetting process, i.e. wrapping. fiber binder. Pulsating jets of binder aerosol, oriented at an angle of 20-50 to the axis of the flame of the blowing of the fibers, lead to a partial orientation of the fibers during their deposition and the formation of mineral wool carpet 9 on the conveyor 10.

Example. The blowing torch 6 of the fiber is formed by a spunbond-blown method: the spunbag is filled with silicate melt 7 and the melt stream flowing out of the spinneret is blown into the diffuser 11 by air jets from the blower of the fiber forming unit 8. The resulting plume 6 for blowing the fibers from the diffuser 11 is directed to the shaft of the vertical fiber deposition chamber 12. Sprayers 1 of the binder, which are simultaneously core gas-jet generators of pulsating aerosol jets, are placed on both 5 sides of the diffuser 11 in the upper part of the shaft of the deposition chamber 12. When the nozzles are positioned in the immediate vicinity of the outer boundary of the flame 6, the fibers are blown and the jets are directed at an angle of 30 to the axis of the flame. A 4% aqueous solution of neutralized phenol alcohols of brand B is used as a binder. Sprayers 1 provide for the creation of pulsating aerosol jets when 50 kg / h of binder solution and 12 nm / h of air under pressure of 0.3 MPa are fed into each of them. In this case, pulsations are generated with a frequency of 22 kHz and a sound pressure intensity of dB. The effective radius of the acoustic field is 0.5 m, and the root angle of the aerosol jet 100. Spreaders 1 are positioned so that the entire section of phage; evil 6 of the filament fiber is in the zone of influence. The average diameter of the binder droplets in pulsating aerosol jets is 10-15 µm. The impact of the blown flame on the pulsating jets of aerosol at an angle of 30 led to an increase in the proportion of vertically oriented fibers in the mineral wool carpet by 12%.

High degree of dispersion and monodispersion of the binder, uniformity of its distribution on the fibers, acoustic activation

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This allows reducing its content, for example, in Ml00 mineral wool plates from 3.5–4% to 2.6–3.1%, i.e. by 15-25%, and also by 2% increase in the yield of products, while the compressibility of the plates is reduced by 40% (see table).

The method of applying a binder to mineral fibers can also be used in the manufacture of mineral wool products from fiber obtained by another method. Thus, in the case of a centrifugal multi-roll fiber-forming method, nozzles generating pulsating jets of a binder aerosol can be brought inside the fiber-deposition chamber on dual (for separate air and binder solution) flexible taps and close to the zones of preferential discharge of fiber from the rolls.

The use of the proposed method is especially advisable in the manufacture of products made of mineral wool with short fiber, since when the uniform distribution of the binder over the surface is increased, the hair compressibility after sorption wetting,%

Reduced binder consumption,%

Average reduction of plate compressibility,%

The number of bonded points of contact between the fibers, increasing the strength of the products, increases.

The advantage of this method is also the simplicity of its implementation, since the generation of pulsations is provided by the same jet as the application of the binder, and the kinetic energy of the air jet is the energy source.

Claims (1)

Invention Formula The method of applying a bond to mineral fibers in the production of mineral wool products by introducing a jet of aerosol binder at an angle 20-50 in the flame of the fiber, which is characterized by the fact that, in order to increase the strength characteristics of the products and reduce the binder consumption by increasing the uniformity of the distribution of the binder on the surface of the fibers with their simultaneous partial orientation, aerosol jets are pulsed 10-30 kHz. 6.5 5.8 5.9 6.9 8.1 18 21 26 31 24 34 41 40 31 20 //