Then, when the hydrogen chloride evolution was completed, the whole solution of glyceryl trichloroformate was treated with saturated ammonium hydroxide solution and the solid precipitates of glycerol tricarbamate were collected by filtration. Preferably, the composite material used to provide said manufactured articles comprises polycarbamide resin F: preferably, the composite material according to the invention is used to produce manufactured articles for the nautical sector and in particular for covering the hull of watercraft; in the building sector with particular reference to lightweight beams, in transportation, for example in the construction of body parts for cars and trains, or in the production of small manufactured articles for series such as for example car mirrors, motorcycle fairings, truck spoilers. Another problem of the most commonly used resins is that the articles manufactured with said resins are unlikely to be recyclable at the end of their life, with consequent economic disadvantages and a high environmental impact. Measure the area of delamination in millimeters. After reading the above description, it will be apparent to those skilled in the relevant art s how to implement the invention in alternative embodiments.
The sample's rigidity shear modulus or strength arising from thermosetting curing of resin is monitored. The quick cure time allows many coats to be built up quickly. In both cases, three specimens were taken along a main direction, designated by the reference letter T, and three specimens were taken along a direction which is perpendicular to the preceding one and is designated by the reference letter L. The reaction was continued for 3. The disclosure and description presented further explain the invention and are not to be interpreted or inferred as limiting thereof. A thermosetting resin composition made by mixing in any proportion two or more thermosetting resin compositions of claims 20- 32.
The polycarbamides can then be recycled partially or totally by depolymerization according to methods presented in the literature, an aspect which is particularly important in many sectors, particularly in the nautical one, where non-recyclable phenolic resins are currently used Ref. The aim and objects of the present invention are also achieved by means of a resin that can be obtained by virtue of said method. The invention has been described with reference to certain aspects, but other aspects and embodiments are apparent to persons of skill in the art, and are included within the scope of the claims. Practical Organic Chemistry 3 rd Ed. The composition was mixed and testing commenced. The composition of the curing agent component affects the curing speed that results when the curing agent is used to cure an isocyanate resin in a two-component coating composition. The pre-polymer which is stable during storage can be obtained with low or high viscosity by choosing the corresponding amount isocyanate, which reacts with polyol.
The temperature of activation is considered to be the temperature at which the adhesive film becomes sticky. Ionic or potentially ionic groups are entered into a polymer skeleton through a difunctional polyol component whose molecule also contains 0. Found to minimize foaming, it is preferable to block the accession of ethylene oxide and propylene oxide. Resin coatings are available from some retailers, allowing you to save hundreds of dollars on installation. Mix from 50 to 90 wt. Then, the polyamide resin was held at 30° C.
This method and process is also applicable to preparing meso-erythritol tetracarbamate, D-xylitol pentacarbamate, D-sorbitol hexacarbamate, D-mannitol hexacarbamate, 1,1,1-trihydroxymethylethane tricarbamate, 1,1,1-trihydroxymethylpropane tricarbamate, and pentaerythritol tetracarbamate. What is claimed is: 1. Invention also describes a method for preparation of indicated composition. Polyurea was originally developed to protect tabletop edges which led to the development of two-component polyurethane and polyurea spray elastomers took place in the 1990s by Mark S Barton and Mark Schlichter patent. Aluminum powder can be applied at this stage to create a non-stick floor if vinyl flakes were not added previously.
In this disclosure, glycerol tricarbamate was synthesized as follows: In a 500 mL three-neck flask equipped with a stirrer, condenser, and thermometer, 14. The condensation reaction is continued for 0. When the two separate components are mixed and applied as a film on the substrate, the mutually reactive compounds in the two components react to crosslink and cure the coating film. In contrast, dispersion, hydrophilinae non-ionic groups, coagulated when heated up to temperatures higher than 60°C. The coating compositions were prepared using a traditional high speed disperser. In the present invention, the application of the resin is focused on the production of a glass fibre composite, wherein the resin has a structural adhesive function and the required properties are charge adhesion and bulk properties, rather than surface properties as for the coating. Maximum shear modulus 4300 5100 4400 psi : Cure time min : 11.
The aim and object of the present invention are also achieved by means of a method for recycling said manufactured article at the end of its life. Siefken, Justus Liebigs Annalen der Chemie, 562, pages 75-136. Preferably, in the method according to the invention the diamine compound A is an ester derivative of aspartic acid having the formula V where X is a linear, branched or cyclic alkyl group or an aromatic group and both can be optionally substituted with other amine functional groups. Suitable complex polyether polyols are primarily linear complex polyetherdiols often weakly branched or complex polyether polyols, which can be synthesized by the known methods of aliphatic, cycloaliphatic or aromatic dicarboxylic or polycarboxylic acids, respectively, their anhydrides, such as succinic acid, glutaric acid, adipic acid, Emelyanova acid, cork acid, azelaic acid, sabotinova acid, nonindigenous acid, decanedicarbonitrile acid, terephthalic acid, isophthalic acid, orthophthalic acid, tetrahydrophtalic acid, hexahydrophthalic acid or trimellitate acid, and acid anhydrides, such as orthophthalic anhydride, trimellitic anhydride or succinic anhydride, or mixtures thereof, and polyhydric alcohols, such as ethanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propandiol, dipropyleneglycol, tripropyleneglycol, tetrapropenyl, 1,3-propandiol, butane-diol-1,4, butanediol-1,3, butanediol-2,3, pentanediol-1,5, hexanediol-1,6, 2,2-dimethyl-1,3-propandiol, 1,4-dihydrocyclopenta, 1,4-Dimethylol-cyclohexane, about Tandil-1,8, decanediol-1,10, dodecanediol-1,12 or mixtures thereof, optionally with joint use of polyols of higher functionality, such as trimethylolpropane, glycerol or pentaerythritol. The results given in Table 1 demonstrate that the panels obtained according to the invention have excellent mechanical properties both for traction and for flexing. Waterborne polyurethane, respectively polyurethane-polycarbamide dispersion with similar built hydrophilic centers have specific advantages and disadvantages. The disclosures in Italian Patent Application No.
The abstract of the disclosure is therefore not intended in any way to be limiting as to the scope of the present invention. As structural components D suitable diols optionally containing from 0. The crude product was purified by suspension in water followed by re-filtration and drying. Descriptions of specific applications are provided only as representative examples. Then, while a small stream of dry nitrogen was being continuously introduced, 1.
After 7 minutes, add 565 g of water and Khujand who are dispersing. The calculated average molecular mass M n polyurethane-polycarbamide is from 3000 to 100000 daltons, preferably from 4500 to 25000 daltons. According to the present invention is especially preferred are liquid at room temperature external emulsifiers with an indicator of the lipophilic-hydrophilic balance in the interval from 12 to 18, particularly preferably from 15 to 18. The compositions were allowed to rest for 24 hours. The compositions were allowed to rest for 24 hours. An example of crosslinking process is described in the following diagram 1 : Diagram 1 Polycarbamide E. Tetrahedron Lett, 27: 5521 1986 from mono-alcohols by using commercially available trichloracetyl isocyanate: In this disclosure, the procedure for glycerol tricarbamate is as follows: In a 100 mL three-neck flask equipped with a stirrer and thermometer, 1.