DD211121A1 - METHOD FOR PRODUCING INSULATED CONTAINERS - Google Patents

Abstract

The invention relates to a "method for the production of insulated containers" according to the sandwich construction, wherein it is important to obtain a stable insulation / support core layer, food-safe equipment and high temperature resistance. Goal d. The invention is to enter the insulation / support layer in a closed operation in the cavities of preferably consisting of Glasfaserverstaagtem polyester resin coat container parts in a simple way. It stands d. Task, a polyurethane foam for effective use, so without conventional compaction of the insulation system, i. under free-flooding in the single-stage or over-coating method with nearly isotropic u. m. appropriate density designed for pressure-resistant properties. D. Essence d. The invention consists in that a PUR structural foam having a free-flooded bulk density of 160-240 kg / m high 3 is modified by addition of 0.05 to 2% water and 0.025 to 1% primary alcohol, preferably ethanol or n-propanol. n-Butanol, to the polyol component, in a mixture o. individually, in the weight ratio of water: Primaeralkohol proportionally 2: 1. D. Invention is preferred f. d. Production of sandwich containers of small and medium size up to a maximum of 1.5 m high 3 Usable volume applied.

Description

" 1

Title of the invention

Process for the preparation of insulated containers

Field of application of the invention ','.

The invention relates to a method for the production of insulated containers, which are characterized by sandwich construction, which must be made food grade, have to tolerate high temperature fluctuations and consist of an insulating layer, which simultaneously provides the function of a support core »

Characteristic of the known technical solutions

The production of containers with Saadwiohkonstruktion is known and customary. The sandwich construction gives the containers above all strength and, depending on the inserted intermediate layer materials more or less pronounced independence of use at temperature extremes. The insulation layer is installed according to the state of the art in general on the basis of ready-to-use Sohaumteilea, predominantly as PVC - hard or polystyrene foam. For example, in WP 115 451 a method for the production of sandwich containers is presented, which wrapped on the basis of the usual Wiokeltechnologle the foam on the fresh inner cover layer for soil and intermediate walls by means of the outer cover layer (impregnated with polyester resin fiberglass fabric)

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In the Federal Republic of Germany OS 1942 728 the production of a double-walled storage container is described, according to which the distano layer, which may inter alia consist of hard foam, is laid against the first jacket.

Furthermore, cavity extraction with PUR systems is common; However, with minimal teohnisohen effort no insulating layer, which acts as a Sttitzkern simultaneously be produced, "Rather, in the latter case, a high degree of compaction, which is known to correlate with the Bruk strength of the foam required. However, this requirement avoids a complicated and expensive molding apparatus.

The usual procedure of sticking and sealing the insulation / StUtζschicht primarily with rigid PVC foam is, especially with respect ebenfläohig - edged container, extremely time consuming and unökonomisoh · Sarüberhinaus that the preferred insulation / support cores rigid PVC foam only a durable heat resistance 40 ⁰ C and due to its preferred! Propellant is physiologically unobjectionable. ,

The aim of the _invention?

The aim of the invention is to carry out the application of the insulation / support layer preferably for containers based on glass fiber-reinforced polyester resin in such an effective manner, saving several operations such as PVC hard foam blanking and sealing and a more economical use of a Insulation / support core system can be realized with weight reduction of the insulation layer and reduced waste rate in the manufacturing process.

This must be done via independent Aussöäumung the insulation layer. The fundamental contradiction to this is to be solved by the requirement for high compressive strength of the support surface, in order to avoid an extremely expensive foaming preparation, which first attains the corresponding degree of compaction in order to achieve the desired compressive strength

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At the highest possible level of cohesion, and at a low degree of compaction, thus enabling free-foaming, a degree of insulation of high insulation strength and unsatisfactory shear strength is obtained.

Explanation of the essence of the invention.

The invention has the object of "ice efficient single-step process for applying a closed power sfäliig en insulating / Stlitzsohioht especially in glass fiber reinforced polyester resin - develop jacket for containers au, wherein the insulating / StUtaschicht the insert when exposed to temperatures from - 20 ⁰ C to 80 ⁰ C grown and must be physiologisch klioh.

The contradiction is to be solved in that, in order to achieve the required relatively high Bruok strength of the Sohaumerrerriert with the bulk density, while approximately isotropic distribution of the insulation / Stützsohioht in the container shell at & f high compression and consequently a complicated, extremely costly Schäumvorriohtung is to dispense, with a high level of effectiveness of the process is the goal. According to the invention, the problem is solved in that between the prefabricated inner and outer OFF layers the reaction mixture of a modified polyurethane structural foam composed of component A contains from 2 to 3 polyol types with average GH numbers of from 380 to 490 mg KOH / g but different lltolekulargewioht (zwisohen 500 and 4000) contains, wherein a component, preferably an amine polyol, characterized by a significantly increased reactivity to the other, and a component B, consisting of Polyphenylenpolymethylenpolyisooyanat, in a batch or, in larger »Container dimension, by machine or by hand, in the overlaying process, the required modification of the PUR system being such that, depending on the apparent bulk density derived from the pressure resistance requirement, 0.05 to 2 % water and 0.025 to 1 % a primary alcohol, preferably Itha nol or n-propanol or '' - butanol,

the latter .One Vex spr'ö dung by Hb he angebet ¹ to groups of substances counteract in Il0l0ktl.lgeru.st, in the Kompö .neat ~ © A before; Processing are mixed · '; It is ansju it strives _s "let in containers with a Iutss ¥ olu ~ mes of 500 liters or more, the 'Tersohättmung. "occurs .getrenat'n & oa ... at least SWEi container parts, for" B * Upper ™ 'and lower part, joining the Behälterteil® aaoh usual 3} @ chnolo-giea ₉ Tb®i SFP -> Sinsats ss ^ B * Upper to realize kidney is * - '.' ·. A particular advantage of. Method is "against previously customary Sohäumteohaologiea, the mx Geährleistung the isotropy of Schaum®® with a bestiira.taB Terdiohtuagsgrad axbeitea mlissen _s not solely to eat speaking Iriioke

Wood shedding already sufficient. .... ., Sine "there is a particular reliability of the process as shown in FIG. ₉ with precisely dosed water / primary alcohol quantity elae,

In the introduction of the primary alcohol, τοπ is assumed to be an optimally determined quantity, which is no more than 1. % J ^ & part (reference point a @ r (S @ wi © ht © asiteile is the component A) -may be allowed -and Behavior of water 3 Brimaralcoholiv.E g .1 is used, otherwise the foaming resistance is abliased A decrease in density occurs up to the stated size order of 1 % by selective reduction of the degree of intermeshing in the molecule bath. "

It is known9 that when water / isooyanate is converted, urea is formed ^ which leads to increasing embrittlement. Furthermore, it is generally .a premature formation of ice ... in 'Sohaum ₉ but which is in turn mainly surtickaufÖhren to the extremely unerwünsohte shrinkage. Observed. · These negative. Effects counteract the modification according to the invention ».

For the operating temperatures of the components preferably tlbllohen areas _s "apply is the use in Eaumtemperatur · A heat of reaction dmroh s" B. "Water cooling is then erforderlioh" when the auszusohäumenden

have a greater distance than 30 sun. In the middle! is. ,. However, such a layer thickness is not necessary because of the excellent insulating properties of a rigid polyurethane foam.Mineral fillers such as silica sand with particle sizes of up to 1 mm may be worked up to 60 parts by weight per 100 parts by weight of the component According to the invention, it is also possible by machine or hand discharge without the use of a mold design with the simplest Holasttitz construction (provided that the material of the jacket at Briioken is around 0 · 2 kp / om-deform hardly) voids with arbitrarily adapted bulk density (up to 24 © kg / iir) auszuschäumen, such as ζ · · · manually impregnated Kühlbö- container, which leads in contrast to ubliohen procedures in addition to the production cost reduction to a system savings · Depending on geometry and Soha however, it is necessary to optimize within the range of the modifiers, taking into account the usual OH / MCO <* processing range.

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In the 25 mm thick cavity of two, with Distanoebolzen (wood) fixed, embedded in a responsive wood ribbed construction, tub-shaped GFP * laminate body with the average size 0.85 m χ 0 * 4? m χ 0 · 35 m are 0.72 kg one with 0.0024 kg of water and 0 «η 0014 kg - mixed butanol good, then 0 * 78 kg polyphenylenpolymethylenpolyisooyanat in a Niederdruokschäummasohine to the reaction brought PUR * structural foam system, the bulk density 180 kg / tor (with modification Bulk density 100 kg nr) poured in with the shortest possible pouring gradient. The lower part thus obtained is ready for installation after cooling of the foam layer (30 min.).

Claims (1)

Process for the production of insulated containers by foaming the cavity formed by, in particular, QFP inner and outer walls in one operation, which takes place in the overreach, in mechanical or manual discharge with polyurethane, characterized in that a structural foam system is based on Polyurethane with a freiversohäumea gross density (Beeher er ersuch) of 160 - 240 kg / nr is modified by the addition * of O.OS? to 2 % of water and 0 * 025 to 1 % of primary alcohol oil, preferably ethanol or n-propanol or n-butanol, to polymer component ₉ in G @ ad.sch or individually ₉ in water, water yield $ primary alcohol ^ 2 ε 1 "Where, without compaction, an approximately isotropic layer of insulation / stucco layer is formed which is as low in suds"