WO2009013767A1 - Processus pour la préparation de matériaux thermoplastiques - Google Patents

Processus pour la préparation de matériaux thermoplastiques Download PDF

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Publication number
WO2009013767A1
WO2009013767A1 PCT/IT2007/000518 IT2007000518W WO2009013767A1 WO 2009013767 A1 WO2009013767 A1 WO 2009013767A1 IT 2007000518 W IT2007000518 W IT 2007000518W WO 2009013767 A1 WO2009013767 A1 WO 2009013767A1
Authority
WO
WIPO (PCT)
Prior art keywords
thermoplastic material
urea
formaldehyde resin
preparation
liquid
Prior art date
Application number
PCT/IT2007/000518
Other languages
English (en)
Inventor
Riccardo Zavaritt
Original Assignee
Corozite S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Corozite S.P.A. filed Critical Corozite S.P.A.
Priority to PCT/IT2007/000518 priority Critical patent/WO2009013767A1/fr
Priority to TW097127738A priority patent/TW200906918A/zh
Publication of WO2009013767A1 publication Critical patent/WO2009013767A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B1/00—Buttons
    • A44B1/02—Buttons characterised by their material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
    • C08G12/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
    • C08G12/34—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds and acyclic or carbocyclic compounds
    • C08G12/36—Ureas; Thioureas
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08L61/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
    • C08L61/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea

Definitions

  • the object of the present invention is to provide ⁇ method for the preparation of a material based on thermoplastic resins, in particular resins of the urea-formaldehyde type, a process or the preparation of said material, as well as the use of said material for the preparation of finished items of various kinds, such as buttons, buckles, frogs, trays, dishes, handles, knobs and hooks, for example.
  • thermoplastic resins in particular resins of the urea-formaldehyde type
  • a process or the preparation of said material as well as the use of said material for the preparation of finished items of various kinds, such as buttons, buckles, frogs, trays, dishes, handles, knobs and hooks, for example.
  • the urea-formaldehyde resins formed from the reaction between urea and formaldehyde conducted according to variable schemes, depending on the specific resin characteristics to be obtained.
  • Urea-formaldehyde resins are commonly used as adhesives, in particular in processes used for the preparation of rigid cardboards, plywood, and wood chipboard. They are also advantageously employed for the preparation of buttons of the so-called “synthetic” or “partially synthetic” type, as an alternative to buttons produced from materials such as mother of pearl, wood, glass paste, corozo, bakelite, galatite, or also as an alternative to buttons produced from different materials such as polyester, abs, nylon and acetate, for example.
  • the method used for the preparation of urea- formaldehyde resin buttons comprises a step of mixing a range of dry components, in the form of powders having different characteristics, among which also the basic urea-formaldehyde resin, with the minimum possible amount of liquid, having an aqueous base, in order to obtain a hard paste.
  • ⁇ colorant or a colouring mix must be foreseen, destined to provide the final colour for the thermoplastic material, and therefore for the button that is to be prepared. Therefore the hard paste thus obtained is coloured in a uniform manner.
  • the process involves the combination of different coloured sheets according to specific schemes and compositions in order to create a cylindrical "log" of thermoplastic material, composed of a plurality of sheets of various colours overlaid on top of one another, and which when seen in section, present a particular combination of colours, depending on the aesthetic effect required for the final button. Any colour effect and colour combination must be obtained by combining the sheets of coloured paste in a specific manner while forming the thermoplastic material "log".
  • the "log” which can also possibly undergo other processes, is inserted into a specific device equipped with a "cylinder” or “bell” through which the material is extruded and sliced into sections forming discs of varying thickness and diameter to obtain so- called “counters".
  • the "counters” thus obtained are then processed according to traditional methods to obtain the finished button.
  • the object of the present invention is to provide a process for the preparation of a thermoplastic material based on a urea- formaldehyde resin that is able to provide said material in a malleable and easily moulded form.
  • Another object of the invention is to provide a process for the preparation of a thermoplastic material with based on urea- formaldehyde resin that enables said material to be subjected to colouring at a successive step.
  • Yet another object of the present invention is to provide a method for the preparation of a thermoplastic material with based on urea- formaldehyde resin that permits further processing of the aforesaid material using various different conditions according to the required results.
  • thermoplastic material based on urea-formaldehyde resin characterised in that it comprises a mixing step of at least one solid phase with at least one liquid phase, said liquid phase, or the total of said liquid phases, being equal to or higher than 15%, preferably comprised between 20% and 40%, in weight, with respect to said solid phase or total of said solid phases, to obtain a paste whose liquid content is comprised between 15% and 35% in weight with respect to the total weight.
  • said liquid content ranges between 21 % and 28% in weight in relation to said paste, and more specifically is approximately 26% of the weight of the said paste.
  • said solid phase comprises at least a urea-formaldehyde resin and said liquid phase comprises water.
  • said liquid phase preferably has a pH level ranging between 7 and 8, more preferably equal to 7,4.
  • said solid phase can comprise at least one urea- formaldehyde resin, other components of the type chosen from among: flour, horn powder and similar products, for example, while said liquid phase, in addition to or as an alternative to water, can comprise glycerine, glycol, soda and similar products.
  • said liquid phase in addition to or as an alternative to water, can comprise glycerine, glycol, soda and similar products.
  • Colouring is performed by adding a colorant or mixture of colorants to the soft paste which has been previously formed and placed in a paste mixer together with the colorant. According to the mixing level set in the machine, the paste will assume either a uniform or non-homogenous colour which can be used to obtain special decorative effects.
  • the aforesaid method represents a great advantage in relation to prior art because the traditional method does not provide non-homogenous colouring.
  • Another advantage is the fact that since it is possible to apply colouring on a previously formed soft paste, the paste can be divided into portions and coloured in different ways to obtain small quantities of different coloured paste.
  • the soft log, or thermoplastic material obtained according to the invention has a humidity percentage higher than 10%, and generally has an average weight much lighter than the logs produced according to prior art.
  • the soft log obtained in this manner which as stated above, is characterised by a liquid content in relation to total weight, of between 15% and 35% in weight, preferably equal to approximately 26% in weight in relation to the total weight, can eventually be successively subjected to further processing, is placed in a specific cylinder or "bell" and extruded to produce counters that are processed successively to obtain the final buttons.
  • the particular apparatus makes it possible to apply variable force and pressure on the cylinder, during the extrusion stage, thanks to an encoder or some other electronic component which permits piston travel control, a variable force and pressure, according to the characteristics of the paste to be extruded, in order to regulate the exit speed of the paste from the extruder head and consequently, also the blades that cut the extruded paste.
  • a variable force and pressure according to the characteristics of the paste to be extruded, in order to regulate the exit speed of the paste from the extruder head and consequently, also the blades that cut the extruded paste.
  • the possibility of regulating the extrusion speed is provided exclusively by the ductile characteristics of the soft paste according to the invention.
  • the extrusion apparatus which also forms part of the present invention, permits the use of a A- blade cutting shaft, in place of the previous system using two blades only.
  • the advantage to be gained in relation to prior art is obvious, in that the cutting speed can be increased considerably. Therefore, described schematically, the apparatus according to the invention foresees an extrusion unit comprising the "cylinder” or "bell” to contain the soft log, previously prepared, coloured and composed according to requirements, an extrusion head which is replaced according to the shape and size of the counters to be produced, a cutting unit dedicated to slicing extruded materials into counters.
  • the apparatus presents innovative aspects in relation to the extrusion unit which is equipped with a variable speed extrusion piston, to permit the extrusion of soft paste at various speeds, according to the thickness and the shape of the counter required.
  • the apparatus differs from that of prior art, which has a constant extrusion speed, imposed by the characteristics of the hard paste to be extruded.
  • the method according to the invention is able to provide a soft paste which can be coloured and combined in different ways to produce a "log" having a smaller size than those used in prior art
  • the cylinder or "bell" mounted on the apparatus according to the invention also represents an innovation in that it is manufactured in a size much smaller than the cylinders mounted on apparatus according to prior art.
  • the advantage once again, relates to the possibility of producing a limited quantity of counters, and therefore buttons, where necessary.
  • the cutting unit which is able to work at a constant cutting speed, and can be equipped with a four-blade shaft, with the obvious advantage of increased cutting speed.
  • the soft paste thus obtained can be advantageously subjected to at least one drying cycle in favourable temperature and humidify conditions. This also applies to the counters which after the extrusion stage can be subjected to at least one drying cycle and at least one pressing stage under predetermined conditions, according to the type of characteristics required of the finished product.
  • the soft paste obtained using the process object of the invention can be processed using traditional equipment, regulating the amount of paste to be extruded in relation to the size of the cylinder.
  • the method according to the present invention therefore provides a thermoplastic material that can be advantageously used for the production of buttons according to the aforesaid description, but it can also be advantageously used to produce items such as buckles, froggings, fashion accessories, small plaques, switch plates, trays, dishes, sanitary components, WC seats, handles, knobs, hooks and other small/medium components in general.
  • thermoplastic material can be advantageously subject to moulding to obtain different forms and applications.
  • thermoplastic material suitable for button production EXAMPLE 1
  • EXAMPLE 1 describes the formulation of a liquid phase as distinct from the solid phase.
  • the two phases are successively mixed together to obtain a soft paste as described previously, characterised in that the liquid content is equal to approximately to 28% in relation to the final soft log.
  • EXAMPLE 2 describes a formulation that does not foresee the preparation of a liquid phase separate from the solid phase, but foresees direct mixing of the various components. In this case a part of the liquid present in the soft log obtained by the mixing of the two phases, is provided by certain components which already contain a certain liquid percentage.
  • the liquid represents approximately 21% of the final soft log .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La présente invention a pour objet un processus pour la préparation d'un matériau à base de résine thermoplastique, en particulier de résine de type urée-formaldéhyde, un procédé pour le traitement dudit matériau, ainsi que l'utilisation dudit matériau pour la préparation d'articles finis de différentes sortes tels que, par exemple, des boucles, des agrafes, des plateaux, des cuvettes, des poignées, des boutons et des crochets.
PCT/IT2007/000518 2007-07-23 2007-07-23 Processus pour la préparation de matériaux thermoplastiques WO2009013767A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IT2007/000518 WO2009013767A1 (fr) 2007-07-23 2007-07-23 Processus pour la préparation de matériaux thermoplastiques
TW097127738A TW200906918A (en) 2007-07-23 2008-07-22 Process for the preparation of thermoplastic materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2007/000518 WO2009013767A1 (fr) 2007-07-23 2007-07-23 Processus pour la préparation de matériaux thermoplastiques

Publications (1)

Publication Number Publication Date
WO2009013767A1 true WO2009013767A1 (fr) 2009-01-29

Family

ID=39274039

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2007/000518 WO2009013767A1 (fr) 2007-07-23 2007-07-23 Processus pour la préparation de matériaux thermoplastiques

Country Status (2)

Country Link
TW (1) TW200906918A (fr)
WO (1) WO2009013767A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB238904A (en) * 1924-08-25 1927-02-24 Fritz Pollak Improved manufacture of condensation products of urea or its derivatives and formaldehyde
GB596363A (en) * 1944-02-15 1948-01-02 Leonard Smidth Process for making urea formaldehyde moulding composition, and products produced therefrom
US4802838A (en) * 1985-04-30 1989-02-07 Heinz Schaaf Apparatus for extrusion of foodstuffs
DE4237067A1 (de) * 1992-11-03 1994-05-05 Psw Knopf Gmbh Kunststoff-Formkörper
WO2005111127A1 (fr) * 2004-05-19 2005-11-24 Corozite S.P.A. Composition empechant la contrefaçon

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB238904A (en) * 1924-08-25 1927-02-24 Fritz Pollak Improved manufacture of condensation products of urea or its derivatives and formaldehyde
GB596363A (en) * 1944-02-15 1948-01-02 Leonard Smidth Process for making urea formaldehyde moulding composition, and products produced therefrom
US4802838A (en) * 1985-04-30 1989-02-07 Heinz Schaaf Apparatus for extrusion of foodstuffs
DE4237067A1 (de) * 1992-11-03 1994-05-05 Psw Knopf Gmbh Kunststoff-Formkörper
WO2005111127A1 (fr) * 2004-05-19 2005-11-24 Corozite S.P.A. Composition empechant la contrefaçon

Also Published As

Publication number Publication date
TW200906918A (en) 2009-02-16

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