RU2005602C1 - Method for production of hydroxyl-containing composition for foamed polyurethane - Google Patents

Abstract

FIELD: plastic processing. SUBSTANCE: flow of polyether polyol is fed at rate of 2-10 m/s at 15-70 C to preliminary mixing chamber to which in separate counterflows at rate of 1-8 m/s at 1-70 C catalyst and foam stabilizer are supplied. Formed flow is fed to static mixer, and then, to next stage of preliminary mixing, to which foaming agent is fed in counterflow at rate of 5-10 m/s at 4-22 C. Resulted flow gets into static mixer. Fire extinguishing additive may be added at rate of 1-10 m/s at 9-40 C. EFFECT: continuous production of hydroxyl-containing composition for foamed polyurethane. 2 cl, 3 tbl

Description

 The invention relates to the field of production of polymeric materials, in particular to the field of producing polyurethane compositions for thermal insulation products in the refrigeration and construction industries, for products with high strength and dielectric characteristics in electronics and communications, as well as for products with variable thickness and complex profile, in the field of medicine and for consumer goods.

 A known periodic method for producing a hydroxyl-containing composition by mixing polyester polyols for a certain time, followed by the addition of a catalyst, an activator mixture and water.

 The disadvantages of the periodic method for producing the polyol as one component are its low productivity, as well as large losses of raw materials at intermediate stages.

The invention is aimed at creating a process for producing a hydroxyl-containing composition in a continuous way, the essence of which is as follows: the composition is obtained by mixing the components in counter flows, first in the preliminary mixing chamber, followed by the receipt of the resulting composition in a static mixer. Mixed streams in the following sequence: mixing the polyesters streams fed at a rate of 2-10 m / s and a temperature of 15-70 ^{° C,} then fed as independent streams colliding catalyst and foam stabilizer at a speed 1.0-8.0 m / s and a temperature of 1 ^-70 ° C, and then supplying the admixed blowing agent stream at a rate of 5-10 m / s and a temperature ^of 4-22 C, and at each step the components are mixed by feeding the counter stream into the premixing chamber and then passing the stream through a static mixer.

 The proposed method for producing polyurethane hydroxyl-containing compositions by the continuous method is characterized by simplicity of instrumentation, ease of maintenance and automatic regulation in accordance with the requirements of the process.

 The degree and efficiency of mixing here is very high, due to the supply of significant capacities to a small volume. Mixing is carried out due to the kinetic energy of the fluid flows. After mixing, a complete mutual distribution of particles is achieved.

 The invention is illustrated in table. 1-3. In the table. Figure 3 shows the analytical properties of samples of finished compositions taken at arbitrary time intervals.

 As can be seen from the examples of the table. 3, the mixing of the components is perfect, since the systems have close values of analytical indicators within the measurement error.

 Description of the technological process.

Components from containers at given temperatures and flow rates through a piping system through a piston pump are fed into the premixing chamber to create a pulsating effect using a valve and a spring. At given speeds and temperatures and their corresponding viscosities, the required local increase in flow rate is created. This high speed in the next section, where the expansion takes place, drops and strong turbulence fields are formed, which mix the phases of the flow. Next, the pre-mixed stream immediately enters a static mixer with an N-shaped nozzle, where forced separation of the stream and its subsequent reduction into a single stream takes place. The number of supplied components is automatically adjusted. The final product of the piping system enters the store, where the thermostating at ²⁰ ° C by analytical quality control indicators.

 The invention is illustrated by the following examples.

EXAMPLE EXAMPLE 1. Laprol stream 373 (87 g) at ³⁰ ° C and Lapromola stream 294 (13 g) at 55 ^{° C} by pipeline via piston pump at a rate of 3 m / sec is fed into the premixing chamber . Next, the resulting stream enters the static mixer for mixing, and then deep into another pre-mixing chamber, which is fed simultaneously from containers piston pumps flow dimethylethanolamine (2.8 g) at a temperature of 1 ^C and a rate of 3 m / s and a foam stabilizer Laprosila stream 406 ( 1.16 g) at ⁶⁰ ° C and a speed of 3 m / s. The resulting stream of polyesters, catalyst, stabilizer enters the static mixer for deep mixing. The resulting stream is supplied to the next pre-mixing step, which fall from the vessel through line via a piston pump a stream of water (2.4 g) at ²⁰ ° C at a rate of 10 m / s. The resulting stream flows into a static mixer for deep mixing. The finished product is piped to the drive, where thermostating occurs at 20 ^o C. The properties of the resulting product are presented in table. 3.

 Similar to example 1, hydroxyl-containing compositions were obtained, the components used in which are presented in table. 1, and the technological parameters of the process are shown in table. 2. The properties of the obtained hydroxyl-containing compositions are presented in table. 3.

The following products are used in the invention:
propoxylated sucrose, representing an oligomeric liquid at ²⁰ ° C the product with terminal hydroxyl groups. An example is Laprol 564 ES (TU 6-55-221-990-88);
hydroxypropyl glycerine, representing an oligomeric liquid at ²⁰ ° C the product with ether linkages and terminal hydroxyl groups. An example is Laprol 373 (TU 6-05-2042-87), Laprol 3003 (TU 6-05-1513-75);
hydroxypropylated ethylenediamine, representing an oligomeric liquid at ²⁰ ° C a product having an increased chemical activity. An example is Lapromol 294 (TU 6-05-1681-80);
blowing agents - distilled water (GOST 6709-72) or drinking water (GOST 2874-85), as well as trichlorofluoromethane with t. bales. 23.8 ^about C. An example is Freon-11 (TU 6-02-727-78), perfluoropentane (TU 6-00-580-7987-89-90);
catalysts: dimethylethanolamine (TU 6-02-1086-77), methylethanolamine (TU 301-02-66-90), oligoester complex of ethoxylated urea and alkali metal salt and carboxylic acid (TU 6-55-221-1295-92);
organosilicon surfactants: KEP-2A (TU 6-02-1086-77), KEP-3, KEP-6, Laprosil 406 (TU 6-55-221-1218-91),
extinguishing agents: trichloroethyl phosphate (TU 6-05-1611-78). (56) Start-up note N 642 for the receipt of component A-355 "A-355" T "NPO" Polymersynthesis ", Vladimir, 1991.

Claims (2)

1. METHOD FOR PRODUCING A HYDROXYL CONTAINING COMPOSITION FOR FOAM POLYURETHANES by mixing polyester polyol, a catalyst and a blowing agent, characterized in that the stream of polyester, fed at a speed of 2-10 m / s at 15 - 70 ^° C, is mixed with those supplied at a speed of 1 - 8 m / s at 1 - 70 ^o With counter independent streams of catalyst and foam stabilizer, then the resulting mixture is combined with a flow of blowing agent supplied at a speed of 5 - 10 m / s at 4 - 22 ^o C, and at each stage the components are mixed by feeding them by streams into the premixing chamber, followed by passing the stream through a static mixer. 2. The method according to p. 1, characterized in that the fire extinguishing additive is mixed in at a speed of 1-10 m / s at 9-40 ^o C.

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