Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
  • C08H8/00—Macromolecular compounds derived from lignocellulosic materials
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
  • B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
  • B27N9/00—Arrangements for fireproofing
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L97/00—Compositions of lignin-containing materials
  • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K21/00—Fireproofing materials
  • C09K21/14—Macromolecular materials
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2201/00—Properties
  • C08L2201/02—Flame or fire retardant/resistant

Definitions

• the invention relates to a flame retardant mixture, in particular a flame retardant mixture for lignocellulosic composites, processes for their production, molding compositions for the production of flame retardant lignocellulosic composites and their use.
• boric acid and its salts US 2002 011 593 A; GB 2 208 150 A1, WO 9913022 A1, US 6 306 317 A
• melamine resins PL 175 517 A
• formaldehyde resins such as urea-formaldehyde resins or melamine-formaldehyde resins in combination with glass fibers as carrier materials for flame retardant treatment of polyolefins such as polyethylene or ethylene-vinyl acetate copolymers (EP 0 219 024 A2) or polybutylene terephthalate (JP 2000 80 253 A ) to use.
• flame retardant mixtures of phosphates and aminoplasts which are applied to polypropylene fibers as a carrier material, are described in DE 23 14 996 A1.
• Flame retardant materials made from aromatic polyamide fibers EP 1 253 236 A1, US 4 162 275 A or polyester fibers (DE 21 28 691 A1), which are impregnated with crosslinkable melamine resins.
• Layered silicates JP 09 227 119 A, US 5 853 886 A
• talc CA 2 000 472 A
• clay US 3 912 532 A
• these carrier-fixed melamine resins are unsuitable as flame retardants for lignocellulosic composites because of the limited compatibility of the carrier material with lignocellulosic substances.
• the object of the invention was achieved by a flame retardant mixture for lignocellulosic composites, the flame retardant mixture according to the invention comprising 60 to 90% by mass of particulate and / or fibrous lignocellulosic substances and 40 to 10% by mass of a flame retardant concentrate fixed to the particulate and / or fibrous lignocellulosic substances 16 to 60% by mass of flame retardants of the boric acid type and / or their salts, 16 to 75% by mass of melamine resins, and the flame retardants chemically coupled to the melamine resins, and the flame retardant concentrates on and / or in the carrier substance of the particulate and / or fibrous lignocellulosic ! Substances
• the flame retardant concentrate fixed to the particulate and / or fibrous lignocellulosic substances consisting of 16 to 60 mass% of flame retardants of the boric acid type and / or their salts and 16 to 75 mass% of melamine resins, additionally has up to 50 mass% of synergists and / or up to 0 to 25% by mass of other additives.
• carrier-fixed is to be understood to mean that the final
• the flame retardant concentrates are fixed on and / or in the lignocellulosic carrier substance.
• the particulate and / or fibrous lignocellulosic substances contained in the flame retardant mixture are preferably chips, fibers and / or
• the particulate lignocellulosic substances preferably have an average diameter of 0.05 to 2 mm.
• Fibrous lignocellulosic substances preferably have an average diameter of 0.02 to 2 mm and an average fiber length of 3 to 35 mm.
• Examples of the melamine resins contained in the flame retardant mixture are polycondensates of melamine or melamine derivatives and Ci-Cio-aldehydes with a molar ratio of melamine or melamine derivative / d-Cio-aldehyde 1: 1 to 1: 6 and their partial etherification products with CiC-IO alcohols, the melamine derivatives preferably ammeline, ammelide, acetoguanamine, Caprino- guanamine and / or butyroguanamine, and C ⁇ -C ⁇ 0 -aldehydes preferably formaldehyde, acetaldehyde, trimethylolacetaldehyde, furfural, glyoxal and / or glutaraldehyde are.
• the melamine resins can also contain 0.1 to 10% by mass, based on the sum of melamine and melamine derivatives, of urea. 0
• the melamine resins contained in the flame retardant mixture are preferably partially or completely etherified with C 1 -C 8 onoalcohols, dialcohols and / or polyalcohols, polycondensates of melamine and CrC 8 aldehydes, particularly preferably of melamine and formaldehyde. 5
• the melamine resins are particularly preferably higher molecular weight melamine resin ethers with a number average molecular weight of 500 to 50,000.
• the flame retardants of the type boric acids and / or their salts contained in the flame retardant mixture are preferably boric acid, metaboric acid,
• the synergists contained in the flame-retardant mixture are preferably 5 urea, melamine, melamine cyanurate, Vietnameseveretherte melamine resin, puii etherified melamine resin precondensates, cyanuric acid, and / or phosphorus salts of the type sodium phosphates, mono-ammonium phosphates and / or ammonium polyphosphates, wherein the proportion of the phosphorus salt, based on the ⁇ ⁇ Total of synergists, is 0 to 60 mass%.
• the phosphorus salts are preferably used encapsulated with melamine resin.
• the further additives contained in the flame retardant mixture are preferably hydrophobizing agents, impregnation aids and / or fixing aids for flame retardants.
• hydrophobizing agents which can be contained in the flame retardant mixture are organic silicon compounds of the type organosilanols, organosiloxanes, organosilanes, organoaminosilanes, amino-terminated or hydroxyl-terminated polyorganosiloxanes; Surface fluorinated SiO 2 nanoparticles, polytetrafluoroethylene nanoparticles and / or copolymers of ethylenically unsaturated C4-C20 dicarboxylic acid anhydrides containing imide groups.
• impregnation aids that can be contained in the flame retardant mixture are methyl cellulose, oxyethyl cellulose and carboxymethyl cellulose.
• fixing agents for flame retardants that can be included in the flame retardant blend ', are methylolated melamine and methylolated acetoguanamine.
• Flame retardant lignocellulosic composites in particular flame retardant mixtures, can be produced according to the invention by a liquid impregnation process, a melt impregnation process and a liquid impregnation-solid mixing process.
• liquid impregnation process for producing the flame retardant mixture for iignocellulosic composites 60 to 90% by mass of particulate and / or fibrous lignocellulosic substances and 40 to 10% by mass of a flame retardant concentrate, composed of 16 to 60% by mass, fixed to the particulate and / or fibrous lignocellulosic substances Type boric acids and / or their salts, 16 to 75
• % By mass of melamine resins, 0 to 50% by mass of synergists and 0 to 25% by mass of further additives, the flame retardants of the boric acid type and / or. the salts of which are chemically coupled to the melamine resins, and the flame retardant concentrates are present in a fixed manner on and / or in the carrier substance of the particulate and / or fibrous lignocellulosic substances, produced by the particulate and / or fibrous 5 lignocellulosic substances by spraying or dipping with solutions or
• Dispersions of flame retardants of the boric acid type and / or their salts are impregnated at temperatures of 20 to 90 ° C, and the particulate and / or fibrous lignocellulosic substances impregnated with flame retardant concentrates are dried at 55 to 170 ° C with partial l o curing of the melamine resins.
• the production is preferably carried out in that the particulate and / or fibrous lignocellulosic substances by spraying or dipping
• the further additives are added to the IVlamine resins, the flame retardants of the boric acid type and / or their salts and / or the synergists, and the impregnation steps take place with or without intermediate drying of the partially impregnated lignocellulosic substances.
• the melt impregnation process for producing the flame retardant mixture for lignocellulosic composites 60 to 90% by mass of particulate and / or fibrous lignocellulosic substances and 40 to 10% by mass of a flame retardant concentrate fixed to the particulate and / or fibrous lignocellulosic substances, consisting of 16 to 60% by mass Flame retardants of the boric acid type and / or their salts, 16 to 75% by mass of melamine resins, 0 to 50% by mass of synergists and 0 to 25% by mass of further additives, with flame retardants chemically coupled to the melamine resins, and the flame retardant concentrates on and / or in the carrier substance the particulate and / or fibrous lignocellulosic substances are fixed to the carrier, produced in that in melts of
• Melamine resin takes place, and the other additives are the melamine resins Flame retardants of the boric acid type and / or their salts and / or the synergists are added.
• a flame retardant concentrate 60 fixed to the particulate and / or fibrous lignocellulosic substances consist of 16 % Flame retardants of the type boric acids and / or their salts, 16 to 75% by mass of melamine resins, 0 to 50% by mass of synergists and 0 to 25% by mass of further additives, the flame retardants being chemically coupled to the melamine resins, and the flame retardant concentrates to and / or present in the carrier substance of the particulate and / or fibrous lignocellulosic substances in a carrier-fixed manner, produced by the particulate and / or fibrous lignocellulosic substances by spraying or dipping with solutions or dispersions of flame retardants from the front
• the particulate and / or fibrous lignocellulosic substances are preferred by spraying or dipping - either with solutions of melamine resins in water, C 8 -C alcohols or mixtures of 10 to 90% by mass water and 90 to 10% by mass C 1 -C 8 -
• the further additives are added to the melamine resins, the flame retardants of the boric acid type and / or their salts and / or the synergists, and the impregnation steps are carried out with intermediate drying or without intermediate drying of the partially impregnated lignocellulosic substances.
• the chemical coupling of the borate flame retardants to the melamine resins can be done during the production of the flame retardant mixture by ATR-IR
• higher molecular weight melamine resin ethers with molar mass numbers of 500 to 50,000 are preferably used as melamine resins.
• compositions for the production of flame-retardant lignocellulosic composites consisting of 40 to 95% by mass of the above-described flame retardant mixture, 60 to 5% by mass of duromer prepolymers of the phenol type, urea type, melamine type, guanidine type, cyanamide type and / or aniline type and 0.1 to 10% by mass of processing aids and / or auxiliaries, produced by dry premixing of the components and, if appropriate, subsequent melt compounding at 100 to 170 ° C. and granulation.
• thermosetting prepolymers type phenol resins which can be contained in the molding compositions for producing the flame-retardant lignocellulosic composites, phenolic resins based on phenol, C ⁇ -Cg- alkylphenols, hydroxyphenols and / or bisphenols.
• duromer prepolymers of the urea resin type which may be contained in the molding compositions for producing the flame-retardant lignocellulosic composites.
• thermoset prepolymers of the melamine resin type which can be contained in the molding compositions for producing the flame-retardant lignocellulosic composites are condensates of melamine and C- t- cio aldehydes with a molar ratio of melamine or melamine derivative / Ci-Cior aldehyde 1: 1 to 1: 6 and their partial etherification products with C 1 -C 10 alcohols.
• duromer prepolymers of the guanamine resin type which can be contained in the molding compositions for producing the flame-retardant lignocellulosic composites are resins which contain benzoguanamine, acetoguanamine, tetramethoxymethylbenzoguanamine, caprinoguanamine and / or butyroguanamine as guanamine component.
• duromer prepolymers of the aniline resin type which can be contained in the molding compositions for producing the flame-retardant lignocellulosic composites are aniline resins which, as aromatic diamines, can also contain toluidine and / or xylidines in addition to aniline.
• Suitable processing aids that can be contained in the molding compositions are lubricants of the zinc stearate, calcium stearate and / or magnesium stearate type, non-stick agents of the talc type, aluminum oxide, sodium carbonate, calcium carbonate, silica and / or polytetrafluoroethylene polymer and / or thermoplastic polymers as flow improvers such as polycaprolactone or ethylene-vinyl acetate copolymer wax.
• the molding compositions may contain pigments, UV absorbers and / or radical scavengers as auxiliary substances.
• suitable pigments which can be contained in the molding compositions according to the invention are iron oxide, ester group-containing isoindoline pigments, anthracene fluorescent dyes, carbazole dioxazine and delta indanthrone blue pigment.
• UV absorbers examples include 2- (2-hydroxy-3-tert-butyl-5-methylphenyl) benzotriazole, 2,4-dihydroxybenzophenone and sodium 3- (2H-benzotriazol-2-yl) -5-sec-butyl-4-hydroxybenzenesulfate.
• Suitable radical scavengers which can be contained in the molding compositions according to the invention are bis- [2,2,6,6-tetramethyl-1- (octyloxy) -4-piperidinyl] ester sebacic acid, bis (2,2,6, 6-tetramethyl-4-piperidinyl) sebacate, N, N'- (2-hydroxyphenyl) ethanediamide and N, N - diformyl-N, N'-di- (1-oxyl radical-2,2,6,6-tetramethyl -4-piperidinyl) -1, 6-hexanediamine.
• flame-retardant lignocellulosic composites produced by extrusion, injection molding or pressing of the above-described molding compositions at 100 to 220 ° C. with simultaneous curing.
• the lignocellulosic composites can preferably be used as flame-retardant semi-finished products and molding materials with high resistance to insect attack, mold and mold attack and with high wash-out resistance of the flame retardant for outdoor use in the construction and leisure sectors.
• the flame-retardant lignocellulosic composites according to the invention are flame-retardant. They decompose very slowly at high temperatures and emit little flammable and toxic gases. Without an external flame, they do not or hardly continue to burn on their own, the heat given off by the thermal
• the flame retardant lignocellulosic composites can be classified as flame retardant (class B1) according to DIN 4102.
• the flame retardants have a high water resistance, since they are protected against washing out, only about 20% by mass of flame retardants which are not fixed to the carrier are slowly washed out. This provides permanent flame protection in a damp or wet environment.
• the flameproofed iignoceiosic composites are highly protected against fungal and mold infestation due to the content of boron compounds. Because the boron compounds are protected against leaching, the lignocellulosic composites can be used in a damp or wet environment.
• example 1 The invention is illustrated by the following examples: example 1
• spruce wood shavings (particle size 0.8 to 3 mm, residual moisture 5% by mass) are heated to 95 ° C in a high-speed mixer (capacity 10 l) at 500 rpm.
• 870 g of a solution of 40 g melamine, 15 g borax and 815 g water heated to 95 ° C. are sprayed onto the moving spruce wood particles through a nozzle within 20 minutes. The temperature is then raised to 120 ° C., dry air is blown in, and the impregnated spruce wood particles are dried to a residual moisture of 2.5% by mass within 90 minutes.
• the spruce wood particles impregnated with boric acid / borax as a flame retardant, melamine resin, and melamine as a synergist are dried at 60 ° C in a dry air stream with removal of water and methanol to a residual moisture of 2% by mass, with a partial hardening of the 5 etherified melamine resin ,
• the flame retardant mixture produced is mixed with 250 g of a 5 granulated melamine resin prepolymer (with methanol and oligocaprolactone, average molecular weight 900, etherified melamine resin oligomer, average molecular weight 5000, molar ratio melamine / formaldehyde 1: 3, free OH groups undetectable, 10 mol% of the methylol groups etherified with oligocaprolactone), and 100 g processing aid (mixture of 92 g polycaprolactone, 0 mol mass 38000, and 8 g zinc stearate) mixed, compounded in a Brabender laboratory extruder at 115 ° C and granulated.
• a 5 granulated melamine resin prepolymer with methanol and oligocaprolactone, average molecular weight 900, etherified melamine resin oligomer, average molecular weight 5000, molar ratio melamine / formaldehy
• the molding compounds produced are pressed at 165 ° C / 50 bar to 15 mm and 30 mm composite panels 150 x 150 mm. 5
• test specimens milled out of the composite panel are tested.
• the test specimens do not continue to burn after 60 s o flame exposure to the test flame (self-extinguishing).
• the test specimens do not glow after removing the test flame.
• the charring is significantly slowed down.
• the lignocellulosic composite can be classified in B1 according to DIN 4102. 5
• test specimens (15 x 15 x 15 mm) from the composite plate are stored in 1000 ml of water at 25 ° C. with moderate stirring to extract the boron compounds, samples are taken after 24 to 240 hours, and the boron content the extraction solution, o determined photometrically.
• Washed-out amount of boron based on 11.2 16.0 19.4 20.1 on the total content of the test specimen (mass%)
• test specimens which were produced from the flame retardant mixture and granulated melamine resin prepolymer prepared in Example 2 leads to the following results:
• Washed-out amount of boron based on 10.5 14.2 17.1 17.7 on the total content of the test specimen (mass%)
• Example 3 Carrying out the experiment as in Example 1, but in the first impregnation step 180 g of a solution of 40 g of urea heated to 95 ° C. and 15 g of borax in 125 g of water are sprayed through a nozzle within 20 minutes.
• test specimens which were produced from the flame retardant mixture and granulated melamine resin prepolymer prepared in Example 3 leads to the following results:
• Washed-out amount of boron based on 14.1 19.0 22.9 23.7 on the total content of the test specimen (mass%)
• Washed-out amount of boron based on 12.7 17.6 21, 0 21, 8 on the total content of the test specimen (mass%)
• the solution is mixed in a high-speed mixer (capacity 10 l) at 55 ° C and 450 rpm on a moving mixture of 770 g pine wood chips (particle size 0.4 to 2.5 mm, residual moisture 10% by mass) and 143 g flax fibers (length 1 up to 15 mm, average diameter 0.07 mm, residual moisture 10 mass%) sprayed on.
• melamine-encapsulated ammonium polyphosphate (average particle size 20 ⁇ m) are then metered into the mixer, the temperature is raised to 75 ° C., dry air is blown in, and the impregnated lignocellulose particles are dried to a residual moisture content of 2.0% by mass, with a partial hardening of the etherified melamine resin.
• ATR / IR analyzes of the dry residue of the impregnation solution show, based on the decrease in typical BOH bands, shifting of the BO bands and decrease of the NH bands in the methyl etherified melamine resin a chemical coupling of the boric acid to the methyl etherified melamine resin.
• the flame retardant mixture prepared is mixed with 350 g of a granulated melamine resin prepolymer (with methanol and polyethylene glycol, average molecular weight 1000, etherified melamine resin oligomer, average molecular weight 0 5000, molar ratio of melamine / formaldehyde 1: 3.5, free OH groups undetectable, 18 mol% of Methylol groups are etherified with polyethylene glycol), and 75 g processing aid (mixture of 57 g polycaprolactone, molecular weight 38000, and 18 g polycaprolactone, molecular weight 2000) are mixed, compounded in a Brabender laboratory extruder at 110 ° C. and granulated. 5
• the molding compounds produced are pressed at 165 ° C / 60 bar to 15 mm composite panels 150 x 150 mm.
• Test specimens (15 x 15 x 15 mm) from the composite plate were stored in 1000 ml of water at 25 ° C. with moderate stirring to extract the boron compounds, samples were taken after 24 to 240 hours, and the boron content of the extraction solution was determined photometrically. 5
• spruce wood shavings (particle size 0.8 to 3 mm, residual moisture 10 mass%) are heated in a high-speed mixer (capacity 10 1) at 700 rpm to 70 ° C.
• a solution of 45 g disodium octaborate, 30 g urea and 10 g boric acid in 160 g water at 70 ° C0 is sprayed onto the moving spruce wood particles.
• 205 g of a solution of 90 g of a methyl etherified melamine resin heated to 70 ° C.
• the flame retardant mixture produced is mixed with 320 g of a granulated melamine resin prepolymer (with methanol and polycapro-lactone, trifunctional, average molecular weight 2000, etherified melamine resin oligomer, average 0 molecular weight 6500, molar ratio melamine / formaldehyde 1: 3.5, free OH groups not detectable, 15 mol% of the methylol groups are with polycaprolactone etherified) mixed, compounded in a Brabender laboratory extruder at 110 ° C and granulated.
• a granulated melamine resin prepolymer with methanol and polycapro-lactone, trifunctional, average molecular weight 2000, etherified melamine resin oligomer, average 0 molecular weight 6500, molar ratio melamine / formaldehyde 1: 3.5, free OH groups not detectable, 15 mol% of the methylol groups are with polycaprolactone
• the molding materials produced are pressed at 170 ° C / 65 bar to 15 mm composite 5 plates 150 x 150 mm.
• test specimens 15 x 15 x 15 mm
• 1000 ml of water 10 test specimens (15 x 15 x 15 mm) from the composite panel in 1000 ml of water are added
• Washed-out amount of boron based on the total content of the test specimen (mass%) 14.2 18.5 22.8 23.7
• the solution is in a high-speed mixer (capacity 10 l) at 60 ° C and 600
• ATR / IR studies of the dry residue of the impregnation solution show a chemical coupling of the boric acid to the methyl etherified melamine resin based on the decrease in typical B-O-H bands, shift of the B-O bands and decrease in N-H bands in the methyl etherified melamine resin.
• the flame retardant mixture prepared is mixed with 220 g of a granulated melamine resin prepolymer (melamine resin oligomer etherified with methanol and triethylene glycol, average molecular weight 3000, molar ratio melamine / formaldehyde 1: 3, free OH groups not detectable, 7 mol% of the o methylol groups are etherified with triethylene glycol ), and 75 g of processing aids (ethylene-vinyl acetate copolymer wax, molecular weight average 6500, vinyl acetate content 16% by mass) mixed, compounded in a Brabender laboratory extruder at 110 ° C and granulated. , ,
• the molding compounds produced are pressed at 165 ° C / 60 bar to 15 mm composite 5 plates 150 x 150 mm.
• test specimens (15 x 15 x 15 mm) from the composite panel in 1000 ml of water are added
• Washed-out amount of boron based on the total content of the test specimen (mass%) 12.8 17.8 21, 8 22.4
• a granulated melamine resin prepolymer (melamine resin oligomer etherified with methanol and bis (hydroxyethyl) terephthalate, average molar mass 4500, molar ratio melamine / formaldehyde 1: 3.2, free OH groups) are placed in a Brabender kneader (capacity 500 ml) undetectable, 22 mol% of the methylol groups are etherified with bis (hydroxyethyl) terephthalate) melted at 85 ° C. and 25 g of boric acid, 12 g of borax and 6 g of melamine are metered into the melt and homogenized for 10 minutes with the melamine resin melt.
• a Brabender kneader capacity 500 ml
• 22 mol% of the methylol groups are etherified with bis (hydroxyethyl) terephthalate) melted at 85 ° C. and 25 g of boric acid,
• the flame retardant mixture is discharged and, after solidification, ground in a granulator.
• the flame retardant mixture prepared is mixed with 100 g of a ground phenol novolak (average molar mass 720, molar ratio phenol / formaldehyde 1: 0.68) and 25 g polycaprolactone (molar mass 38000), compounded in a Brabender laboratory extruder at 120 ° C. and granulated. 5
• the molding materials produced are pressed at 15 ° C / 50 bar to 15 mm composite sheets 150 x 150 mm.
• Test specimens (15 x 15 x 15 mm) from the composite plate were stored in 1000 ml of water at 25 ° C. with moderate stirring to extract the boron compounds, samples were taken after 24 to 240 hours, and the boron content of the extraction solution was determined photometrically.
• Washed-out amount of boron based on the total content of

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