Abstract:
The present invention relates to a process for producing melamine-urea-formaldehyde resins with up to 0.9% of melamine by reacting a) urea which comprises from 0 to 10% by weight of one or more compounds A, formaldehyde, and melamine in the presence of a base at a pH of from 7.5 to 11, at a temperature of from 20 to 120° C., and at a pressure of from 0.1 to 10 bar, b) and then carrying out reaction in the presence of an acid which optionally comprises urea with from 0 to 10% by weight of one or more compounds A, at a temperature of from 60 to 180° C., and at a pressure of from 0.1 to 10 bar, and c) and then adding urea which comprises from 0 to 10% by weight of one or more compounds A, which comprises carrying out b) at a pH of from 4 to 5.9.
Abstract:
The present invention relates to a binder composition comprising
a) component A comprising polymer(s) A1 having primary and/or secondary amino groups wherein polymer(s) A1 has(have) a primary and secondary amine group nitrogen content (NCps) of at least 1 wt.-% and b) component B comprising hydroxyacetone.
Abstract:
The present invention relates to a binder composition comprising component A comprising polymer(s) A1 and optionally component B comprising component B1 which is selected from the group consisting of a mono-saccharide s, disaccharides, hydroxyacetone, glycolaldehyde and mixtures thereof, wherein polymer(s) A1 comprises at least 70 wt.-% poly(amino acid)s based on the total weight of the polymers) A1 and has (have) a total weight average molecular weight Mw,total of 800 g/mol to 10.000 g/mol, wherein the binder composition comprises 60 to 100 wt.-% polymer(s) A1, and 0 to 40 wt.-% component B1, based on the total weight of the sum of polymer(s) A1 and component B1, wherein the weight amounts of the polymer(s) A1 and component B1 are selected such that the total weight of the sum of polymer(s) A1 and component B1 is 100 wt.-%.
Abstract:
The invention is directed to lignocellulosic materials having a core and two outer layers, containing in the core A) lignocellulose particles; B) expanded plastics particles having a bulk density in the range from 10 to 150 kg/m3, C) one or more binders selected from the group consisting of aminoplast resin, phenoplast resin, and organic isocyanate having at least two isocyanate groups, and D) optionally additives and in the outer layers E) lignocellulose particles, F) one or more binders selected from the group consisting of aminoplast resin, phenol-formaldehyde resin, and organic isocyanate having at least two isocyanate groups, and where the lignocellulose particles of the outer layers E comprise at least 25% by weight of lignocellulosic chips and the expanded plastics particles B are present in nonuniform distribution in the core.
Abstract translation:本发明涉及具有芯和两个外层的木质纤维素材料,其包含在芯A)木质纤维素颗粒中; B)膨胀密度在10至150kg / m 3范围内的膨胀塑料颗粒,C)一种或多种选自氨基塑料树脂,酚醛树脂和具有至少两个异氰酸酯基团的有机异氰酸酯的粘合剂,D )任选的添加剂和外层E)木质纤维素颗粒,F)一种或多种选自氨基塑料树脂,酚醛树脂和具有至少两个异氰酸酯基团的有机异氰酸酯的粘合剂,其中木质纤维素颗粒 外层E包含至少25重量%的木质纤维素片,并且发泡塑料颗粒B以不均匀分布存在于芯中。
Abstract:
The present invention relates to a process for producing melamine-urea-formaldehyde resins with up to 0.9% of melamine by reacting a) urea which comprises from 0 to 10% by weight of one or more compounds A, formaldehyde, and melamine in the presence of a base at a pH of from 7.5 to 11, at a temperature of from 20 to 120° C., and at a pressure of from 0.1 to 10 bar, b) and then carrying out reaction in the presence of an acid which optionally comprises urea with from 0 to 10% by weight of one or more compounds A, at a temperature of from 60 to 180° C., and at a pressure of from 0.1 to 10 bar, and c) and then adding urea which comprises from 0 to 10% by weight of one or more compounds A, which comprises carrying out b) at a pH of from 4 to 5.9.
Abstract:
The present invention relates to processes for discontinuously or continuously preparing aminoplast solutions by condensation of aminoplast formers with formaldehyde in a serial cascade of at least three stirred tank apparatus A, B, and C, which involves a) in apparatus A, reacting a mixture comprising formaldehyde and urea in a molar ratio of 2.3:1 to 2.9:1 and water at a pH of 6 to 8, set by means of a base, at a temperature of 80 to 85° C., where apparatus A consists of one or more, i.e., one to ten, preferably one to five, more preferably one to three, more particularly one or two stirred tanks in parallel or in series, very preferably of one stirred tank, b) in apparatus B, reacting said mixture at a molar ratio of formaldehyde to urea of 1.9:1 to 2.6:1, where apparatus B consists of one or more stirred tanks, wherein the molar ratio of formaldehyde to urea is lowered, optionally by further addition of urea, in stages to not less than 1.9:1, at a pH of 3.5 to 5.5, which is kept virtually constant, at a temperature of 100 to 105° C., and with a mean residence time of 10 to 90 minutes in the entire apparatus B, c) in apparatus C, at a temperature of 90 to 100° C., raising the pH to at least 5.9 and lowering the molar ratio of formaldehyde to urea to 1.7:1 to 1.4:1, where apparatus C consists of one or more stirred tanks, and d) by adding urea, at temperatures of 15 to 100° C., setting a final molar ratio of formaldehyde to urea of 0.7:1 to 1.28:1 and a pH of at least 7.
Abstract:
The invention is directed to lignocellulosic materials having a core and two outer layers, containing in the core A) lignocellulose particles; B) expanded plastics particles having a bulk density in the range from 10 to 150 kg/m3, C) one or more binders selected from the group consisting of aminoplast resin, phenoplast resin, and organic isocyanate having at least two isocyanate groups, and D) optionally additives and in the outer layers E) lignocellulose particles, F) one or more binders selected from the group consisting of aminoplast resin, phenol-formaldehyde resin, and organic isocyanate having at least two isocyanate groups, and where the lignocellulose particles of the outer layers E comprise at least 25% by weight of lignocellulosic chips and the expanded plastics particles B are present in nonuniform distribution in the core.
Abstract translation:本发明涉及具有芯和两个外层的木质纤维素材料,其包含在芯A)木质纤维素颗粒中; B)膨胀密度在10至150kg / m 3范围内的膨胀塑料颗粒,C)一种或多种选自氨基塑料树脂,酚醛树脂和具有至少两个异氰酸酯基团的有机异氰酸酯的粘合剂,D )任选的添加剂和外层E)木质纤维素颗粒,F)一种或多种选自氨基塑料树脂,酚醛树脂和具有至少两个异氰酸酯基团的有机异氰酸酯的粘合剂,其中木质纤维素颗粒 外层E包含至少25重量%的木质纤维素片,并且发泡塑料颗粒B以不均匀分布存在于芯中。