WO2021064712A1 - Composition adhésive - Google Patents

Composition adhésive Download PDF

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Publication number
WO2021064712A1
WO2021064712A1 PCT/IB2020/059328 IB2020059328W WO2021064712A1 WO 2021064712 A1 WO2021064712 A1 WO 2021064712A1 IB 2020059328 W IB2020059328 W IB 2020059328W WO 2021064712 A1 WO2021064712 A1 WO 2021064712A1
Authority
WO
WIPO (PCT)
Prior art keywords
component
range
adhesive composition
epoxy resin
present disclosure
Prior art date
Application number
PCT/IB2020/059328
Other languages
English (en)
Inventor
Vipin Virendra SHUKLA
Ravi Kanakasabapathy KUMAR
Susmit Suhas RITHE
Siddhant Rajesh CHAURASIA
Original Assignee
Reliance Industries Limited
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 Reliance Industries Limited filed Critical Reliance Industries Limited
Publication of WO2021064712A1 publication Critical patent/WO2021064712A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/203—Solid polymers with solid and/or liquid additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/205—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase
    • C08J3/21—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase
    • C08J3/212—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase and solid additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins

Definitions

  • the present disclosure relates to an adhesive composition.
  • Tensile strength refers to a measurement of the force that can be applied to a material before it yields (stretches irreparably) or breaks.
  • Flexural strength of a material is defined as its ability to resist deformation under load. Flexural strength indicates how much force is required to break a test sample of defined diameter.
  • Compressive strength refers to the maximum stress a material can sustain under crush loading.
  • Adhesives are used in many applications such as packaging, construction, automobile, electronics, and the line.
  • An adhesive formulation/composition depends on the base materials and requirements of a particular application. Wood has been used as an important building material. Over the time, different types of artificial wood composites such as thermoset and thermoplastic composites are used in the structural applications.
  • thermoset composites impregnated with fillers are quite stable in dimension, these composites often undergo thermal deformation with heat and humidity, leading to its commercial value destruction.
  • An object of the present disclosure is to ameliorate one or more problems of the prior art or to at least provide a useful alternative.
  • An object of the present disclosure is to provide an adhesive composition that enhances thermal stability, flexural strength, and flexural modulus of the wood composites and avoid shrinkage of the wood composites.
  • Another object of the present disclosure is to provide an adhesive composition that can be used with different substrates. Yet another object of the present disclosure is to provide a process for the preparation of the adhesive composition.
  • the coating composition comprises a first component comprising (i) an epoxy resin in an amount in the range of 30 to 70 wt% by the total weight of the first component; (ii) at least one diluent in an amount in the range of 5 to 10 wt% to the total weight of the first component; (iii) glass fiber reinforced polymer in an amount in the range of 30 to 60 wt% to the total weight of the first component; and a second component comprising (i) curing agent in an amount in the range of 20 to 60wt% by the total weight of the second component; and (ii) glass fiber reinforced polymer in an amount in the range of 40 to 60 wt% the total weight of the second component; wherein the first component and the second component are mixed in a weight ratio in the range of 10:5 to 10:7 before application to obtain said adhesive composition.
  • the process for the preparation of adhesive composition comprises blending of at least one epoxy resin with at least one diluent at a speed in the range of 200 rpm to 300 rpm for a first predetermined time period to obtain a resin mixture. Further, a glass fiber reinforced polymer is blended with the resin mixture at a speed in the range of 300 rpm to 400 rpm for a second predetermined time period to obtain the first component. Separately, blending at least one curing agent and a glass fiber reinforced polymer at a speed in the range of 300 rpm to 400 rpm for a third predetermined time period to obtain the second component. The first component and second component are mixed before application to obtain the adhesive composition.
  • the adhesive composition of the present disclosure provides enhanced flexural strength, tensile strength, and compressive strength to substrates.
  • Figure 1 illustrates the graph depicting a tensile strength of the adhesive cast sheet of the present disclosure
  • Figure 2. illustrates the graph depicting a flexural strength of the adhesive cast sheet of the present disclosure
  • Figure 3. illustrates the graph depicting a compressive strength of the adhesive cast sheet of the present disclosure
  • Figure 4. illustrates tire graph depicting a flexural strength of the adhesive composition of the present disclosure and other adhesive systems on the wood substrate.
  • Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details, are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
  • Wood and or artificial wood composites are prone to deformations while exposed to more stringent environmental conditions like higher temperatures, direct sunlight, and humidity.
  • composites impregnated or filled with inorganic fillers or ground fillers were used for structural applications. Despite being stable in dimension, these composites often undergo thermal deformation with heat and humidity.
  • Various adhesives have been also used in an effort to improve the thermal stability of the wood composites. However, there is still a need to improve the thermal stability and avoid shrinkage of the wood composites upon exposure to stringent environmental conditions, which results in destruction of the commercial value of the composite.
  • the present disclosure provides an economical adhesive composition, which improves thermal stability and avoids shrinkage of the wood composites.
  • the coating composition comprises a first component comprising (i) an epoxy resin in an amount in the range of 30 to 70 wt% by the total weight of the first component; (ii) at least one diluent in an amount in the range of 5 to 10 wt% to the total weight of the first component; (iii) glass fiber reinforced polymer in an amount in the range of 30 to 60 wt% to the total weight of the first component; and a second component comprising (i) curing agent in an amount in the range of 20 to 60 wt% by the total weight of the second component; and (ii) glass fiber reinforced polymer in an amount in the range of 40 to 60 wt% by the total weight of the second component.
  • the first component and second component are mixed in a weight ratio in the range of 10:5 to 10:7 before application to obtain said adhesive composition.
  • the epoxy resin is at least one selected from bisphenol-A based epoxy resin, bisphenol-F based epoxy resin, modified bisphenol based epoxy resin, and hydrogenated bisphenol based epoxy resin.
  • the epoxy resin is bisphenol-A based epoxy resin.
  • the diluent is at least one selected from phenyl glycidyl ether, butanediol diglycidyl ether, and cardanol glycidyl ether. In an exemplary embodiment of the present disclosure, the diluent is 1,4 - butanediol diglycidyl ether.
  • the polymer is selected from epoxy polymer, polyester, and vinyl ester polymer. In an exemplary embodiment of the present disclosure, the polymer is polyester.
  • the particle size of the glass fiber reinforced polymer is in the range of 300 to 400 microns.
  • the ‘glass fiber reinforced polymer’ is also referred to as ‘FRP regrind’ or ‘FRP dust’ which is prepared by grinding the composite (unsaturated polyester resin and glass fiber) into powder form.
  • the particle size of the glass fiber reinforced polymer is 350 microns.
  • the curing agent is at least one selected from cycloaliphatic amine adducts, aliphatic amine adducts, polyaminoamides, and phenalkamine.
  • the curing agent is cycloaliphatic polyamine.
  • the present disclosure provides a process for the preparation of epoxy resin based adhesive composition.
  • epoxy resin is blended with diluent at a speed in the range of 200 rpm to 300 rpm for a first predetermined time period to obtain a resin mixture.
  • the epoxy resin is blended with diluent at a speed of 250 rpm.
  • the epoxy resin is at least one selected from bisphenol-A based epoxy resin, bisphenol-F based epoxy resin, modified bisphenol based epoxy resin, and hydrogenated bisphenol based epoxy resin.
  • the epoxy resin is bisphenol-A based epoxy resin.
  • the diluent is at least one selected from phenyl glycidyl ether, butanediol diglycidyl ether, and cardanol glycidyl ether. In an exemplary embodiment of the present disclosure, the diluent is 1,4 - butanediol diglycidyl ether.
  • the first predetermined time period is in the range of 5 min to 30 min. In an exemplary embodiment of the present disclosure, the first predetermined time period is 15 min.
  • the polymer is selected from epoxy polymer, polyester, and vinyl ester polymer. In an exemplary embodiment of the present disclosure, the polymer is polyester.
  • glass fiber reinforced polymer is blended with the resin mixture at a speed in the range of 300 rpm to 400 rpm for a second predetermined time period to obtain the first component.
  • the glass fiber reinforced polymer is blended with the resin mixture at a speed of 350 rpm.
  • the particle size of the glass fiber reinforced polymer is in the range of 300 to 400 microns. In an exemplary embodiment of the present disclosure, the particle size of the glass fiber reinforced polymer is 350 microns.
  • the second predetermined time period is in the range of 30 min to 90 min. In an exemplary embodiment of the present disclosure, the second predetermined time period is 30 minutes.
  • a curing agent is blended with a glass fiber reinforced polymer at a speed in the range of 300 rpm to 400 rpm for a third predetermined time period to obtain the second component.
  • the curing agent is blended with a glass fiber reinforced polymer at a speed of 350 rpm.
  • the curing agent is at least one selected from cycloaliphatic amine adducts, aliphatic amine adducts, polyaminoamides, and phenalkamine.
  • the curing agent is cycloaliphatic polyamine.
  • the third predetermined time period is in the range of 30 min to 90 min. In an exemplary embodiment of the present disclosure, the third predetermined time period is 30 minutes.
  • the mixture is evaluated for its consistency after the completion of the second predetermined time period and third predetermined time period. On evaluation, if the mixture is not consistent, the mixing process is continued until the uniform consistency of the mixture is achieved.
  • the so obtained first component and the second component are mixed to obtain the adhesive composition.
  • the adhesive composition of the present disclosure is prepared as adhesive cast sheets.
  • the adhesive cast sheets are prepared by mixing the first component and second component in a weight ratio of 100:65 to obtain the adhesive composition.
  • the so obtained adhesive composition is poured in the mould to obtain adhesive cast sheets.
  • the present disclosure provides the economical adhesive composition, which on application enhances thermal stability and avoids shrinkage of the wood composites, even after exposure to stringent environmental conditions for longer durations.
  • the adhesive composition also helps in enhancing the flexural strength, tensile strength, compressive strength, and modulus of the wood composites.
  • the adhesive composition of the present disclosure can be used with a variety of substrates such as wood, artificial wood, metal, plastic, and fiber reinforced polymer (FRP) composite.
  • EXAMPLE 1 Process for the preparation of adhesive composition in accordance with the present disclosure a) First component
  • epoxy resin (YD 128 resin liquid epoxy resin with medium viscosity produced from bisphenol-A and epichlorohydrin) was charged to the reactor and 6 gm of 1,4 - Butanediol diglycidyl ether (RD 103LE) was added to the resin.
  • the resin and 1,4 - Butanediol diglycidyl ether were blended at a speed of 250 rpm for 15 min to obtain a resin mixture.
  • 49 gm of glass fiber reinforced polymer (particle size of 350 microns) was added slowly to the reactor and blended at a speed of 350 rpm for a period of 30 minutes to obtain a first component.
  • the first component was prepared by using the ingredients having the amounts as specified in Table- 1.
  • cycloaliphatic polyamine TH 7301
  • glass fiber reinforced polymer particle size of 350 microns
  • the cycloaliphatic polyamine and glass fiber reinforced polymer was blended at a speed of 350 rpm for a period of 30 minutes to obtain a second component.
  • the second component was prepared by using the ingredients having the amounts as specified in Table-2.
  • the so obtained first component (100 gm) was mixed with the second component (65 gm) using a mechanical mixer for 1 min to 2 min to obtain the adhesive composition.
  • the tensile strength of the adhesive cast sheet of the present disclosure (3 samples) was determined according to ASTM D638. The samples were evaluated for tensile modulus (Young's modulus), % elongation at break (elongation at yield). The tensile strength was determined according to ASTM D638 using a universal testing machine (UTM) (Instron). The results are provided in table 3 below, illustrated in Figure 1.
  • the adhesive cast sheet of the present disclosure has a tensile modulus of > 3.7 GPa, and % elongation at break of > 1.34.
  • the flexural strength of the adhesive cast sheet of the present disclosure (3 samples) was determined according to ASTM D790. The samples with the dimensions of about 13 m width and 4 mm depth were placed on two supports and a load was applied at the center. The load at yield provides the flexural strength details. The results are provided in table 4 below, illustrated in Figure 2.
  • the adhesive cast sheet of the present disclosure has a flexural strength of > 48 MPa, and a flexural modulus of > 2 Gpa EXAMPLE 4: Compressive Strength
  • the compressive strength of the adhesive cast sheet of the present disclosure (2 samples) was determined according to ASTM D695. The samples were evaluated for compressive strength and modulus using a universal testing machine (UTM) (Instron). The results are provided in table 5 below, illustrated in Figure 3.
  • the adhesive cast sheet of the adhesive composition of the present disclosure has a compressive strength of > 56 MPa, and a modulus of > 3.5 Gpa.
  • the adhesive composition of the present disclosure was evaluated for flexural strength by joining the wood substrates.
  • the first and second component of the adhesive composition in the ratio of 100:65 by weight was mixed by mechanical mixer for 2 min to obtain the adhesive composition.
  • the adhesive composition was applied on a clean wood substrate (RelWood) with a moisture content of not more than 4%.
  • a thin layer of the adhesive composition was applied with the help of a trowel on both surfaces to be stuck.
  • Appropriate support is provided to the joined surfaces by placing weights, or by using a screw or fastener.
  • the excess adhesive composition ooze out from the substrates was wiped with the help of a trowel.
  • the joined substrates are allowed to dry at room temperature overnight before testing.
  • the adhesive composition was evaluated for the flexural strength and deformations of the wood substrates while exposed to the hot conditions.
  • the wood substrates were stuck by 4 different adhesive compositions, i.e. adhesive A (adhesive composition of the present disclosure), adhesive B (glass fiber reinforced polymer + PVC solvent cement), adhesive C (Glass mat + Liquid epoxy system (Epoxy resin (YD 128 - Aditya Birla) and Hardener (TH 7301 - Aditya Birla)), adhesive D (only solvent cement).
  • adhesive A adhesive composition of the present disclosure
  • adhesive B glass fiber reinforced polymer + PVC solvent cement
  • adhesive C Glass mat + Liquid epoxy system (Epoxy resin (YD 128 - Aditya Birla) and Hardener (TH 7301 - Aditya Birla)
  • adhesive D only solvent cement

Abstract

La présente invention concerne une composition adhésive et un procédé pour sa préparation. La composition adhésive comprend une résine époxy, un diluant, un agent de durcissement et un polymère renforcé par des fibres de verre. Les compositions adhésives peuvent être utilisées sur divers substrats. La composition adhésive de la présente invention empêche efficacement la déformation de substrats même dans des conditions météorologiques chaudes pendant l'été.
PCT/IB2020/059328 2019-10-05 2020-10-05 Composition adhésive WO2021064712A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201921040448 2019-10-05
IN201921040448 2019-10-05

Publications (1)

Publication Number Publication Date
WO2021064712A1 true WO2021064712A1 (fr) 2021-04-08

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Application Number Title Priority Date Filing Date
PCT/IB2020/059328 WO2021064712A1 (fr) 2019-10-05 2020-10-05 Composition adhésive

Country Status (1)

Country Link
WO (1) WO2021064712A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150065613A1 (en) * 2012-04-26 2015-03-05 Dow Mf Produktions Gmbh & Co. Ohg Epoxy adhesive composition
CN107987767A (zh) * 2016-10-26 2018-05-04 北京天山新材料技术有限公司 一种环氧树脂胶黏剂及应用

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150065613A1 (en) * 2012-04-26 2015-03-05 Dow Mf Produktions Gmbh & Co. Ohg Epoxy adhesive composition
CN107987767A (zh) * 2016-10-26 2018-05-04 北京天山新材料技术有限公司 一种环氧树脂胶黏剂及应用

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