Bio-based two-component polyurethane adhesive composition, and method for preparing the same.

Abstract

This invention relates to a bio-based two-component polyurethane adhesive composition, wherein at least 40% by weight of all organic components in the composition is a bio-based material. The bio-based two-component polyurethane adhesive composition exhibits excellent adhesion to various untreated (or untreated) metal substrates. The bio-based two-component polyurethane adhesive composition has been developed for use as an adhesive for corner joints of doors and windows.

Description

Technical Field

[0001] Technical Field The present invention relates to a bio-based two-component polyurethane adhesive composition in which at least 40% by weight of all organic components in the composition are bio-based materials. The bio-based two-component polyurethane adhesive composition according to the present invention exhibits excellent adhesiveness to various untreated (or unprocessed) metal substrates.

Background Art

[0002] Background of the Invention In recent years, with the development of the economy, systematic windows / doors using larger and thicker glass have become increasingly popular due to their aesthetic appearance and the advantages of heat insulation and sound insulation, and they require much higher profile strength, especially much higher corner joint strength. Therefore, in order to strengthen mechanically fastened corner joints, since treatments such as polishing and degreasing cannot be performed at the manufacturing site, various untreated (or unprocessed) metal substrates, especially 3003 aluminum profiles or cleats, 6063 aluminum profiles or cleats, 6060 aluminum profiles or cleats, and SS301 stainless steel cleats are desired to have an adhesive for corner joints that exhibits excellent adhesiveness.

[0003] <0000However, none of the adhesives currently used as corner joint adhesives exhibit good adhesion to a variety of untreated (or unprocessed) metal substrates simultaneously. Furthermore, as is known from the prior art, one-component polyurethane adhesives in the prior art generally foam and therefore exhibit lower adhesive strength, while two-component polyurethane adhesives in the prior art do not foam and therefore exhibit higher adhesive strength. However, it remains difficult for currently available two-component polyurethane adhesives to achieve extremely high adhesive strength on various substrates, for example, greater than 15 MPa on untreated (or unprocessed) metal substrates. Therefore, it is desirable to obtain a two-component polyurethane adhesive composition that exhibits excellent adhesion to a variety of untreated (or unprocessed) metal substrates.

[0004] Furthermore, conventional two-component polyurethane adhesives are petrochemical-based and therefore use energy-intensive processes. However, conventional natural oil-based two-component polyurethane adhesives have challenges in achieving high-strength adhesion to metal substrates, and improving adhesive performance generally requires the introduction of fossil fuel-derived raw materials. There is a growing demand for the production of environmentally friendly two-component polyurethane adhesives that reduce the carbon footprint (carbon dioxide emissions). Therefore, high-performance bio-based two-component polyurethane adhesive compositions with a high bio-based content are desirable. [Overview of the project] [Problems that the invention aims to solve]

[0005] Based on the above, and taking the above considerations into account, there is a need for a bio-based two-component polyurethane adhesive composition that has a high bio-based content and exhibits excellent adhesion to various untreated (or unprocessed) metal substrates. [Means for solving the problem]

[0006] Summary of the Invention The present invention relates to a bio-based two-component polyurethane adhesive composition comprising component (A) and component (B), wherein component (A) is as follows: (a1) Based on the total weight of component (A), 20-40% by weight of natural oil-based polyols, (a2) Based on the total weight of component (A), 0.75 to 7.5% by weight of liquid bio-based phenolic resin, (a3) Based on the total weight of component (A), 1 to 10% by weight of modified castor oil polyester and / or trifunctional polyether and / or polyfunctional polyester polyol having 2 or more functional groups, (a5) 20-50% by weight of inorganic filler based on the total weight of component (A) It contains the following component (B): (b2) Based on the total weight of component (B), 5 to 20% by weight of polyfunctional polyisocyanates with 2 or more functional groups, and (b3) 20-50% by weight of inorganic filler based on the total weight of component (B) Includes, At least 40% by weight, preferably at least 45% by weight, of all organic components in the composition are bio-based materials. The composition provides a bio-based two-component polyurethane adhesive composition, further comprising 2 to 25% by weight of a rheology modifier in component (A) and / or component (B), based on the total weight of the composition.

[0007] The present invention involves the following steps: (1) A step of preparing component (A), the following: mixing all liquid components, including components (a1), (a2), and (a3), and, if used, a chain extender, to obtain a mixture; mixing component (a5) and, if used, a moisture scavenger, to the mixture obtained above; then adding components (a4) and (a6), if used, a rheological modifier and / or pigment, if used, to the mixture and further mixing the resulting mixture; and removing any air bubbles therein; Steps including, (2) A step of preparing component (B), comprising: mixing all liquid components, including components (b1), (b2), and, if used, plasticizers and / or moisture scavengers, to obtain a mixture; mixing material (b3) into the mixture obtained above; adding rheological modifiers and / or pigments to the mixture as needed, if used, and mixing further; and removing any air bubbles therein; Steps including The present invention provides a method for preparing a bio-based two-component polyurethane adhesive composition, which includes [the specified component].

[0008] The present invention provides a method for joining corner joints using a bio-based two-component polyurethane adhesive composition according to the present invention, the method comprising the steps of: mixing components (A) and (B) of the composition to produce an uncured product; injecting the uncured product into a corner cavity; and curing the uncured product.

[0009] In addition, the present invention further provides a cured product obtained from a bio-based two-component polyurethane adhesive composition based on the present invention.

[0010] Furthermore, the present invention provides for the use of a bio-based two-component polyurethane adhesive composition according to the present invention for bonding metals, marble, ceramic tiles, wood, and surface-treated plastics. [Effects of the Invention]

[0011] The bio-based two-component polyurethane adhesive composition, preparation method, bonding method, cured product, and use according to the present invention are all based on the following remarkable discovery by the inventors: the bio-based two-component polyurethane adhesive composition according to the present invention utilizes a specific combination of components (A) and (B), has a high bio-based content, and exhibits excellent adhesion to various untreated (or untreated) metal substrates. In particular, the bio-based two-component polyurethane adhesive composition according to the present invention has a bio-based content of 40% or more, and the lap shear strength of Alu3003 / Alu3003 is greater than 15 MPa, the lap shear strength of Alu6063 / Alu6063 is greater than 18 MPa, and the lap shear strength of Alu6060 / SS301 is greater than 18 MPa. [Modes for carrying out the invention]

[0012] Detailed description of the invention Those skilled in the art will understand that this description merely outlines exemplary embodiments and is not intended to limit broader aspects of the invention. Each embodiment described herein can be combined with any other embodiment unless explicitly stated otherwise. In particular, any feature indicated as preferred or advantageous can be combined with any other feature indicated as preferred or advantageous.

[0013] Unless otherwise specified, the terms "a," "an," and "the" used herein shall include both singular and plural forms.

[0014] As used herein, the terms “comprising” and “comprises” are synonymous with “including,” “includes,” “containing,” or “contains,” and are comprehensive or non-restrictive, and do not exclude any additional, undescribed elements, components, or process steps.

[0015] Unless otherwise specified, the description of numerical endpoints includes all numbers and percentages within the respective ranges, as well as the recited endpoints.

[0016] Unless otherwise specified, the term "room temperature" used herein refers to 23 ± 2 °C in all cases.

[0017] Unless otherwise specified, all parameters used herein are tested, where applicable, according to the methods based on the examples in this specification.

[0018] Unless otherwise defined, all terms used in the disclosure of the invention, including technical and scientific terms, shall have the meanings commonly understood by those skilled in the art.

[0019] According to the present invention, surprisingly, the inventors of the present invention have found a bio-based two-component polyurethane adhesive composition containing components (A) and component (B), which has a high bio-based content and exhibits excellent adhesiveness to various untreated (or non-treated) metal substrates: Component (A) is as follows: (a1) 20 to 40% by weight of a natural oil-based polyol, based on the total weight of component (A), (a2) 0.75 to 7.5% by weight of a liquid bio-based phenolic resin, based on the total weight of component (A), (a3) 1 to 10% by weight of a modified castor oil polyester and / or trifunctional polyether, based on the total weight of component (A), and (a5) 20 to 50% by weight of an inorganic filler, based on the total weight of component (A) and component (B) is as follows: (b2) 5 to 20% by weight of a polyisocyanate having two or more functional groups, based on the total weight of component (B), and (b3) 20 to 50% by weight of an inorganic filler, based on the total weight of component (B) and where at least 40% by weight, preferably at least 45% by weight, of all the organic components in the composition are bio-based materials, The composition further comprises 2 to 25% by weight of a rheological modifier in component (A) and / or component (B), based on the total composition weight of the composition.

[0020] In a first embodiment, the disclosure generally relates to a two-component bio-based polyurethane adhesive composition comprising component (A) and component (B), wherein component (A) is as follows: (a1) Based on the total weight of component (A), 20-40% by weight of natural oil-based polyols, (a2) Based on the total weight of component (A), 0.75 to 7.5% by weight of liquid bio-based phenolic resin, (a3) Based on the total weight of component (A), 1 to 10% by weight of modified castor oil polyester and / or trifunctional polyether, (a5) 20-50% by weight of inorganic filler based on the total weight of component (A) It contains the following component (B): (b2) Based on the total weight of component (B), 5 to 20% by weight of polyfunctional polyisocyanates with 2 or more functional groups, and (b3) 20-50% by weight of inorganic filler based on the total weight of component (B) Includes, Here, at least 40% by weight, preferably at least 45% by weight, of all organic components in the composition is a bio-based material. The composition relates to a bio-based two-component polyurethane adhesive composition, further comprising 2 to 25% by weight of a rheological modifier in component (A) and / or component (B), based on the total composition weight of the composition.

[0021] Ingredients (a1) According to the present invention, component (A) of the bio-based two-component polyurethane adhesive composition contains 20 to 40% by weight of a natural oil-based polyol (component (a1)) based on the total weight of component (A).

[0022] Examples of natural oil-based polyols include: castor oil polyols, lechesterella oil polyols, soybean oil polyols, coconut oil polyols, cochin oil polyols, corn oil polyols, cottonseed oil polyols, linseed oil polyols, olive oil polyols, palm oil polyols, palm kernel oil polyols, peanut oil polyols, sunflower oil polyols, tall oil polyols, animal fat polyols, tung oil polyols, whale oil polyols, tea seed oil polyols, sesame oil polyols, safflower oil polyols, rapeseed oil polyols, fish oil polyols, derivatives of any of these, and any combination thereof. Preferably, the natural oil-based polyol used in the present invention is selected from the group consisting of castor oil-based polyols, lechesterella oil-based polyols, soybean oil-based polyols, coconut oil-based polyols, cochin oil-based polyols, corn oil-based polyols, cottonseed oil-based polyols, linseed oil-based polyols, olive oil-based polyols, palm oil-based polyols, palm kernel oil-based polyols, peanut oil-based polyols, sunflower oil-based polyols, tall oil-based polyols, animal fat-based polyols, tung oil-based polyols, whale oil-based polyols, tea seed oil-based polyols, sesame oil-based polyols, safflower oil-based polyols, rapeseed oil-based polyols, fish oil-based polyols, any derivatives thereof, and any combination thereof. More preferably, the natural oil-based polyol used in the present invention is a castor oil-based polyol.

[0023] Examples of commercially available natural oil-based polyols include: AGROL, which includes AGROL 3.0, a soybean-derived polyol available from BioBased Technologies; SOYOL, which includes SOYOL R2-052, a soybean-derived polyol available from Urethane Soy Systems Company; and Primary Castor Oil (1), a 100% bio-based castor oil polyol available from Panyu Zhongxin. STThe natural oil-based polyol is preferably a 100% solid castor oil derivative available from Panyu Zhongxin. ST This is grade caster oil.

[0024] Preferably, the amount of component (a1) is 25 to 38% by weight, based on the total weight of component (A).

[0025] If component (A) does not contain component (a1), the bio-based two-component polyurethane adhesive composition cannot have a bio-based content of 40% or more, nor can it exhibit excellent adhesion to various untreated (or untreated) metal substrates.

[0026] Ingredient (a2) According to the present invention, component (A) of the bio-based two-component polyurethane adhesive composition contains 0.75 to 7.5% by weight of liquid bio-based phenolic resin (component (a2)) based on the total weight of component (A).

[0027] Preferably, the liquid bio-based phenolic resin used in the present invention is a cashew nut shell oil-based phenolic resin. Examples of commercially available liquid bio-based phenolic resins include, but are not limited to, Polycard XFN-50, Polycard XFN-53, and Polycard 425M, all available from Chemical Technical Services Inc. in Kettering, Ohio; CX-9201, CX 9203, NX-9001, NX-9001LV, NX-9004, NX-5285, GX-9005, GX-9006, GX-9007, GX-9101, GX-9102, GX-9103, and GX-9104, all available from Cardolite Corp. in Monmouth Junction, New Jersey; and Agrol Platinum, available from BioBased Technologies in Rogers, Arkansas. Preferably, the liquid bio-based phenolic resin is NX-9001, which is available from Cardolite.

[0028] Preferably, the amount of component (a2) is 1 to 5% by weight, and more preferably 2 to 4.5% by weight, based on the total weight of component (A).

[0029] If component (A) does not contain component (a2), or if the amount of component (a2) is not within the range of 0.75 to 7.5% by weight based on the total weight of component (A), the bio-based two-component polyurethane adhesive composition cannot exhibit good adhesion to various untreated (or untreated) metal substrates.

[0030] Ingredients (a3) According to the present invention, component (A) of the bio-based two-component polyurethane adhesive composition comprises 1 to 10% by weight of modified castor oil polyester and / or trifunctional polyether and / or polyfunctional polyester polyol having 2 or more functional groups (component (a3)) based on the total weight of component (A).

[0031] The modified castor oil polyester, trifunctional polyether, and polyfunctional polyester polyol having two or more functional groups used as component (a3) ​​may be those commonly used in the art to which the present invention belongs.

[0032] Examples of commercially available modified castor oil polyesters include, but are not limited to, Sovermol 760 from BASF, LOCTITE LA 6099 from Henkel, and Sovermol 805 from BASF. Preferably, the modified castor oil polyesters used herein are Sovermol 760 from BASF and / or LOCTITE LA 6099 from Henkel.

[0033] Examples of commercially available trifunctional polyethers include, but are not limited to, VORANOL CP 450, a trifunctional polypropylene glycol available from Dow. Preferably, the trifunctional polyether used herein is VORANOL CP 450, available from Dow.

[0034] According to the present invention, component (A) of the bio-based two-component polyurethane adhesive composition contains a modified castor oil polyester and / or a trifunctional polyether and / or a polyfunctional polyester polyol having two or more functional groups as component (a3), but it is preferable that component (A) simply contains a modified castor oil polyester or a trifunctional polyether as component (a3). In a preferred embodiment of the present invention, when component (A) simply contains a modified castor oil polyester as component (a3), one or two types of modified castor oil polyester may be used.

[0035] In a preferred embodiment of the present invention, when component (A) of the bio-based two-component polyurethane adhesive composition simply contains modified castor oil polyester as component (a3), the total amount of modified castor oil polyester is 2 to 10% by weight, preferably 3 to 9% by weight, based on the total weight of component (A). When the amount of modified castor oil polyester is within the above preferred range, the adhesive strength of the bio-based two-component polyurethane adhesive composition to various untreated (or untreated) metal substrates is further improved.

[0036] In another preferred embodiment of the present invention, when component (A) of the bio-based two-component polyurethane adhesive composition simply contains a trifunctional polyether as component (a3), the total amount of the trifunctional polyether is 5 to 10% by weight, preferably 6 to 9% by weight, based on the total weight of component (A). When the amount of trifunctional polyether is within the above preferred range, the adhesive strength of the bio-based two-component polyurethane adhesive composition to various untreated (or untreated) metal substrates is further improved.

[0037] Ingredients (a4) According to the present invention, component (A) of the bio-based two-component polyurethane adhesive composition may optionally contain a catalyst (a4). Preferably, component (A) of the bio-based two-component polyurethane adhesive composition according to the present invention contains a catalyst (a4). More preferably, the amount of component (a4) is 0.003 to 0.1% by weight based on the total weight of component (A).

[0038] The catalyst used as component (a4) may be one that is conventionally used in the art to which the present invention belongs. The catalyst may be an aliphatic amine catalyst and / or an organometallic catalyst. Preferably, the catalyst is an organolead or organotin catalyst. More preferably, the catalyst is an organotin catalyst.

[0039] Examples of commercially available catalysts include, but are not limited to, Fomrez UL-28, an organotin catalyst available from Momentive, and Fomrez UL-29, Dabco T 12, Dabco T 131, and Dabco 33LV, available from Evonic. Preferably, the catalyst used in this specification is Fomrez UL-28, available from Momentive.

[0040] Ingredients (a5) According to the present invention, component (A) of the bio-based two-component polyurethane adhesive composition contains 20 to 50% by weight of an inorganic filler (component (a5)) based on the total weight of component (A).

[0041] The inorganic filler used as component (a5) may be one that is commonly used in the art to which the present invention belongs. Examples of inorganic fillers used as component (a5) in the bio-based two-component polyurethane adhesive composition according to the present invention include, but are not limited to, heavy calcium carbonate, ultrafine silica powder, ceramic microbeads, aluminum oxide, aluminum hydroxide, talc, bentonite, attapulgite, calcium phosphate, calcium sulfate, magnesium oxide, zinc oxide, aluminum nitride, and boron nitride, as well as any combination thereof. Preferably, the inorganic filler used as component (a5) is selected from the group consisting of heavy calcium carbonate, ultrafine silica powder, and ceramic microbeads, more preferably from the group consisting of heavy calcium carbonate and ultrafine silica powder, and most preferably heavy calcium carbonate.

[0042] Examples of commercially available inorganic fillers used as component (a5) in this specification include, but are not limited to, calcium carbonate CC1000, a 1000-mesh heavy calcium carbonate available from Guangfu Building Materials Fine Chemical Industry Co., calcium carbonate CC700, a 700-mesh heavy calcium carbonate available from Guangfu Building Materials Fine Chemical Industry Co., and SFJ 0020, a 20 μm ultrafine silica powder available from SJF. Preferably, the inorganic filler used as component (a5) is calcium carbonate CC1000 and / or calcium carbonate CC700 available from Guangfu Building Materials Fine Chemical Industry Co., and more preferably calcium carbonate CC1000 available from Guangfu Building Materials Fine Chemical Industry Co.

[0043] Preferably, the amount of component (a5) is 20 to 45% by weight based on the total weight of component (A).

[0044] Ingredients (a6) According to the present invention, component (A) of the bio-based two-component polyurethane adhesive composition may optionally contain 0.1 to 1% by weight of an adhesion promoter (component (a6)) based on the total weight of component (A).

[0045] The adhesion promoter used as component (a6) may be one that is commonly used in the art to which the present invention belongs. Preferably, the adhesion promoter is a silane, more preferably a mercaptosilane.

[0046] An example of a commercially available adhesion promoter is Dynasylan MTMO, a silane adhesion promoter (3-mercaptopropyltrimethoxysilane) available from Evonic. This includes, but is not limited to, the following. Preferably, the adhesion promoter is Dynasylan MTMO, available from Evoic.

[0047] Preferably, component (A) of the bio-based two-component polyurethane adhesive composition contains 0.1 to 1% by weight of an adhesion promoter (component (a6)) based on the total weight of component (A). When component (A) contains component (a6), the adhesive strength of the bio-based two-component polyurethane adhesive composition to various untreated (or untreated) metal substrates is further improved.

[0048] Ingredients (a7) In some embodiments of the present invention, component (A) of the bio-based two-component polyurethane adhesive composition according to the present invention may further optionally include additives commonly used in the art to which the present invention belongs, such as chain extenders, rheology modifiers, moisture scavengers, and pigments, provided that they do not adversely affect the desired technical effects of the composition of the present invention. Preferably, component (A) of the bio-based two-component polyurethane adhesive composition according to the present invention further includes at least one component (component (a7)) selected from the group consisting of chain extenders, rheology modifiers, moisture scavengers, and pigments. The presence, type, and amount of additives can be determined by those skilled in the art as desired.

[0049] Settlement volume of solid component (A) Furthermore, surprisingly, the inventors of the present invention have found that when the solid sedimentation volume of component (A) in the present invention is 15-30 mL / g, particularly 20-25 mL / g, as measured by the method described in the examples of the present invention, the bio-based two-component polyurethane adhesive composition according to the present invention is more suitable as an adhesive for corner joints.

[0050] Component (b1) According to the present invention, component (B) of the bio-based two-component polyurethane adhesive composition may optionally contain 20 to 45% by weight of a bio-based polyurethane prepolymer (component (b1)) based on the total weight of component (B).

[0051] The bio-based polyurethane prepolymer used as component (b1) may be one that is commonly used in the art to which the present invention belongs. Preferably, the bio-based polyurethane prepolymer used as component (b1) herein is obtained from a bio-based polyol and an isocyanate. More preferably, the bio-based polyol used in the synthesis of component (b1) is 100% bio-based polyol, and / or the isocyanate used in the synthesis of component (b1) is selected from the group consisting of liquefied diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate / 2,4-diphenylmethane diisocyanate mixture, toluene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and modified forms thereof. Among the others, carbodiimide-modified MDI is even more preferred as the isocyanate used in the synthesis of component (b1).

[0052] Examples of commercially available bio-based polyols used in the synthesis of component (b1) include, but are not limited to, primary castor oil, a 100% bio-based castor oil polyol available from Panyu Zhongxin, and Volvetol H1000, a 100% bio-based polyol available from Weylchem. Preferably, the bio-based polyol used in the synthesis of component (b1) is primary castor oil, available from Panyu Zhongxin, and / or Volvetol H1000, available from Weylchem.

[0053] Examples of commercially available isocyanates used in the synthesis of component (b1) include, but are not limited to, Desmodur CD C, a carbodiimide-modified MDI (with a 29% NCO content) available from Covestro AG. Preferably, the isocyanate used in the synthesis of component (b1) is Desmodur CD C, available from Covestro AG.

[0054] The reaction conditions for preparing the bio-based polyurethane prepolymer used as component (b1) can be determined by those skilled in the art.

[0055] Preferably, the amount of component (b1) is 30 to 45% by weight based on the total weight of component (B).

[0056] Preferably, component (b1) has an isocyanate content of 10 to 25% by weight based on the total weight of component (B).

[0057] Ingredient (b2) According to the present invention, component (B) of the bio-based two-component polyurethane adhesive composition contains 5 to 20% by weight of a polyfunctional polyisocyanate (component (b2)) having 2 or more functional groups, based on the total weight of component (B).

[0058] The polyfunctional polyisocyanate having two or more functional groups used as component (b2) may be one that is commonly used in the art to which the present invention belongs. Preferably, the polyfunctional polyisocyanate having two or more functional groups used as component (b2) is polymethylene polyphenyl polyisocyanate, and more preferably 4,4'-diphenylmethane diisocyanate.

[0059] Examples of polyfunctional polyisocyanates with two or more functional groups used as component (b2) include, but are not limited to, Desmodur 44V 20L, an isocyanate (4,4'-diphenylmethane diisocyanate) available from Covestro AG. Preferably, the polyfunctional polyisocyanate with two or more functional groups used as component (b2) is Desmodur 44V 20L, available from Covestro AG.

[0060] Ingredient (b3) According to the present invention, component (B) of the bio-based two-component polyurethane adhesive composition contains 20 to 50% by weight of an inorganic filler (component (b3)) based on the total weight of component (B).

[0061] The inorganic filler used as component (b3) may be one that is commonly used in the art to which the present invention belongs, and may be the same as or different from the inorganic filler used as component (a5). Examples of inorganic fillers used as component (b3) in a bio-based two-component polyurethane adhesive composition include, but are not limited to, heavy calcium carbonate, ultrafine silica powder, ceramic microbeads, aluminum oxide, aluminum hydroxide, talc, bentonite, attapulgite, calcium phosphate, calcium sulfate, magnesium oxide, zinc oxide, aluminum nitride, and boron nitride, and any combination thereof. Preferably, the inorganic filler used as component (b3) herein is selected from the group consisting of heavy calcium carbonate, ultrafine silica powder, and ceramic microbeads, more preferably from the group consisting of heavy calcium carbonate and ultrafine silica powder, and most preferably heavy calcium carbonate.

[0062] Examples of commercially available inorganic fillers used as component (b3) in this specification include, but are not limited to, calcium carbonate CC1000, a 1000-mesh heavy calcium carbonate available from Guangfu Building Materials Fine Chemical Industry Co., calcium carbonate CC700, a 700-mesh heavy calcium carbonate available from Guangfu Building Materials Fine Chemical Industry Co., and SFJ 0020, a 20 μm ultrafine silica powder available from SJF. Preferably, the inorganic filler used as component (b3) is calcium carbonate CC1000 and / or calcium carbonate CC700 available from Guangfu Building Materials Fine Chemical Industry Co., more preferably calcium carbonate CC1000 available from Guangfu Building Materials Fine Chemical Industry Co.

[0063] Preferably, the amount of component (b3) is 30-45% by weight based on the total weight of component (B).

[0064] Ingredient (b4) In some embodiments of the present invention, component (A) of the bio-based two-component polyurethane adhesive composition according to the present invention may further optionally include additives commonly used in the art to which the present invention belongs, such as plasticizers, moisture scavengers, rheology modifiers, and pigments, provided that they do not adversely affect the desired technical effects of the composition of the present invention. Preferably, component (B) of the bio-based two-component polyurethane adhesive composition according to the present invention further includes at least one component (b4) selected from the group consisting of plasticizers, moisture scavengers, rheology modifiers, and pigments. The presence, type, and amount of additives can be determined by those skilled in the art as desired.

[0065] Rheological modifier According to the present invention, a bio-based two-component polyurethane adhesive composition contains, based on the total weight of the composition, 2 to 25% by weight of a rheological modifier in component (A) and / or component (B) as essential components.

[0066] The rheological modifier used in the bio-based two-component polyurethane adhesive composition according to the present invention may be one that is conventionally used in the art to which the present invention belongs. Examples of rheological modifiers include, but are not limited to, precipitated calcium carbonate, unmodified fumed silica, and surface-modified fumed silica. Preferably, the rheological modifier used herein is selected from the group consisting of precipitated calcium carbonate, unmodified fumed silica, and surface-modified fumed silica.

[0067] Even more surprisingly, we have found that when both components (a5) and (b3) are heavy calcium carbonate, and the rheology modifier is a combination of precipitated calcium carbonate and fumed silica (including both unmodified fumed silica and surface-modified silica), the adhesive strength of the bio-based two-component polyurethane adhesive composition to various untreated (or untreated) metal substrates is further improved. In other words, in certain bio-based two-component polyurethane adhesive compositions according to the present invention, a specific combination of heavy calcium carbonate, precipitated calcium carbonate, and fumed silica yields an unexpected technical effect with respect to the adhesive strength to various untreated (or untreated) metal substrates.

[0068] Preferably, the total amount of rheological modifiers is 3 to 20% by weight, and more preferably 4 to 15% by weight, based on the total weight of the composition.

[0069] In a preferred embodiment of the present invention, component (A) comprises 2 to 25% by weight of precipitated calcium carbonate and / or 0 to 5% by weight of fumed silica, based on the total weight of component (A).

[0070] Alternatively, or additionally, in a preferred embodiment of the present invention, component (B) comprises 0 to 8% by weight of precipitated calcium carbonate and / or 1 to 5% by weight of fumed silica, based on the total weight of component (B).

[0071] In a preferred embodiment of the present invention, the viscosities of components (A) and (B) are similar to each other for easier mixing. In particular, the viscosity ratio of component (A):component (B) is preferably 2:1 to 1:2.

[0072] In another preferred embodiment of the present invention, in order to obtain excellent gap-filling properties without sagging, and to ensure that high viscosity is obtained at low shear rates and low viscosity at high shear rates, the thixotropy indices of components (A) and (B), calculated as the low shear viscosity (1 / s) / high shear viscosity (10 / s), are both greater than 5.

[0073] In a more preferred embodiment of the present invention, component (A) comprises a pigment exhibiting a first color, component (B) comprises a pigment exhibiting a second color, and the mixture obtained by mixing components (A) and (B) exhibits a third color, wherein the first, second, and third colors are distinct from each other, and as a result, a visually detectable indicator is provided to confirm the correct mixing ratio when mixing. The bio-based two-component polyurethane adhesive composition according to this embodiment provides a visual indicator of improper testing during injection, thus preventing leakage of the adhesive from the cartridge due to high pressure when applied to corner joints, resulting in incorrect mixing ratios and reduced adhesive strength after curing.

[0074] In a second embodiment, this disclosure involves the following steps: (1) A step of preparing component (A), the following: mixing all liquid components, including components (a1), (a2), and (a3), and, if used, a chain extender, to obtain a mixture; mixing component (a5) and, if used, a moisture scavenger, to the mixture obtained above; then adding components (a4) and (a6), if used, a rheological modifier and / or pigment, if used, to the mixture and further mixing the resulting mixture; and removing any air bubbles therein; Steps including, (2) A step of preparing component (B), comprising: mixing all liquid components, including components (b1), (b2), and, if used, plasticizers and / or moisture scavengers, to obtain a mixture; mixing material (b3) into the mixture obtained above; adding rheological modifiers and / or pigments to the mixture as needed, if used, and mixing further; and removing any air bubbles therein; Steps including The present invention relates to a method for preparing a two-component bio-based polyurethane adhesive composition, including the components described herein.

[0075] The rheological modifier used in the bio-based two-component polyurethane adhesive composition according to the present invention can be prepared by preparation methods commonly used in the art to which the present invention belongs. Preferably, the components are prepared in the following steps: (1) a step of preparing component (A), comprising: mixing all liquid components including components (a1), (a2), and (a3), and, if used, a chain extender, to obtain a mixture; mixing component (a5), and, if used, a moisture scavenger, into the mixture obtained above; then adding components (a4) and (a6), and, if used, a rheological modifier and / or pigment, to the mixture and further mixing the resulting mixture; and removing any air bubbles therein; and (2) a step of preparing component (B), comprising: mixing all liquid components including components (b1), (b2), and, if used, a plasticizer and / or moisture scavenger, to obtain a mixture; mixing material (b3) into the mixture obtained above; adding, if used, a rheological modifier and / or pigment to the mixture and further mixing; and removing any air bubbles therein; The composition can be prepared by a method that includes a step. The preparation of the composition is preferably carried out at room temperature. The mixer used for preparation may be any mixing device that is common in the art. After preparation, components (A) and (B) should be packaged and stored separately before use.

[0076] In a third embodiment, the present disclosure relates to a method for joining corner joints using a bio-based two-component polyurethane adhesive composition according to the present invention, the method comprising the steps of: mixing components (A) and (B) of the composition, preferably by a static mixer, to produce an uncured product; injecting the uncured product into a corner cavity; and curing the uncured product.

[0077] Component (A) and component (B) are mixed so that the volume ratio of component (A) to component (B) is 3:1 to 1:3, preferably 2:1 to 1:2, more preferably 1.5:1 to 1:1.5, and most preferably 1.1:1 to 1:1. In particular, the volume ratio of component (A) to component (B) is 1:1.

[0078] An uncured product of a bio-based two-component polyurethane adhesive composition according to the present invention may be cured by conventional curing methods in the art to which the present invention belongs. Preferably, the uncured product may be cured at 20 to 100°C, preferably 20 to 90°C, for 1 to 48 hours, preferably 3 to 36 hours, and more preferably 6 to 24 hours. More preferably, the uncured product may be cured at room temperature for 1 to 8 hours, and then cured at 60 to 100°C for 8 to 16 hours to accelerate curing.

[0079] In a fourth embodiment, the disclosure relates to cured products obtained from a bio-based two-component polyurethane adhesive composition according to the present invention.

[0080] In a fifth aspect, the disclosure relates to the use of a bio-based two-component polyurethane adhesive composition according to the present invention for bonding metals, marble, ceramic tiles, wood, and surface-treated plastics.

[0081] The bio-based two-component polyurethane adhesive composition according to the present invention is preferably used for joining untreated (or unprocessed) metal substrates, particularly window profiles and corner joint cleats. More particularly, the composition according to the present invention is used as an adhesive for corner joints in doors and windows, especially aluminum and / or steel doors and windows, for example, in door frames and window frames.

[0082] The bio-based two-component polyurethane adhesive composition according to the present invention has a high bio-based content and exhibits excellent adhesion to various untreated (or untreated) metal substrates by utilizing a specific combination of components (A) and (B). In particular, the bio-based two-component polyurethane adhesive composition according to the present invention has a bio-based content of 40% or more, and the lap shear strength of Alu3003 / Alu3003 is greater than 15 MPa, the lap shear strength of Alu6063 / Alu6063 is greater than 18 MPa, and the lap shear strength of Alu6060 / SS301 is greater than 18 MPa. [Examples]

[0083] The following examples are intended to help those skilled in the art to better understand and implement the present disclosure. The scope of the present invention is not limited by the examples but is defined by the appended claims. Unless otherwise specified, all parts and percentages are based on weight.

[0084] Part I. Preparation of the composition and its properties raw materials Ingredients (a1): Ingredient a1-1: 100% bio-based castor oil polyol available from Panyu Zhongxin. ST Grade caster oil. Components a1-2': Poly BD R45V, a polyolefin resin (polybutanediol) available from Cray Valley.

[0085] Ingredients (a2): Ingredient a2-1: Cardolite NX-9001, a cashew nut shell oil-based phenolic resin available from Cardolite.

[0086] Ingredients (a3): Ingredient a3-1: VORANOL CP 450, a trifunctional polypropylene glycol available from Dow. Ingredient a3-2: Sovermol 760, a modified castor oil polyester available from BASF. Ingredient a3-3: LOCTITE LA 6099, a modified castor oil polyester available from Henkel. Ingredients a3-4: Sovermol 805, a modified castor oil polyester available from BASF.

[0087] Ingredients (a4): Component a4-1: Fomrez UL-28, a catalyst available from Momentive.

[0088] Ingredients (a5): Ingredients a5-1: Calcium Carbonate CC1000, a 1000-mesh heavy calcium carbonate available from Guangfu Building Materials Fine Chemical Industry Co. Ingredients a5-2: Calcium Carbonate CC700, a 700-mesh heavy calcium carbonate available from Guangfu Building Materials Fine Chemical Industry Co. Component a5-3: SFJ 0020, a 20 μm ultrafine silica powder available from SJ.

[0089] Ingredients (a6): Component a6-1: Dynasylan MTMO, a silane adhesion promoter (3-mercaptopropyltrimethoxysilane) available from Evoic.

[0090] Ingredients (a7): Ingredient a7-1: Glycerol 99.7% USP, a chain extender available from Cargill Incorporate. Ingredient a7-2: Winnofil SPT, a rheological modifier (precipitated calcium carbonate) available from Imery. Component a7-3: Aerosil R 202, a rheological modifier (surface-modified fumed silica) available from Evonik. Component a7-4: Aerosil 200, a rheological modifier (fumed silica) available from Evonik. Ingredient a7-5: Purmol 3 ST, a moisture scavenger (3M molecular sieve) available from ZEOCHEM AG. Ingredients a7-6: Hostaperm Blue A4R, which is a 15:1 ratio of pigment blue available from Clariant.

[0091] Ingredient (b1): Component b1-1: 100% bio-based castor oil polyol for the preparation of bio-based polyurethane prepolymers available from Panyu Zhongxin. ST Grade caster oil. Components b1-2: Volvetol H1000, a 100% bio-based polyol available from Weylchem ​​for the preparation of bio-based polyurethane prepolymers. Components b1-3: Desmodur CD C, a carbodiimide-modified MDI (containing 29% NCO) available from Covestro AG.

[0092] Ingredient (b2): Ingredient b2-1: Desmodur 44V 20L, an isocyanate (4,4'-diphenylmethane diisocyanate) available from Covestro AG.

[0093] Ingredient (b3): Ingredient b3-1: Calcium Carbonate CC1000, a 1000-mesh heavy calcium carbonate available from Guangfu Building Materials Fine Chemical Industry Co. Ingredient b3-2: Calcium Carbonate CC700, a 700-mesh heavy calcium carbonate available from Guangfu Building Materials Fine Chemical Industry Co. Component b3-3: SFJ 0020, a 20 μm ultrafine silica powder available from SJF.

[0094] Ingredient (b4): Ingredient b4-1: Jayflex DINP, a plasticizer available from Exxon Mobile. Ingredient b4-2: Benzoflex 2088, a plasticizer available from Eastman. Component b4-3: Additive TI, a moisture scavenger (Borchers tosyl isocyanate) available from Milliken. Ingredient b4-4: Winnofil SPT, a rheological modifier (precipitated calcium carbonate) available from Imery. Components b4-5: Aerosil R 202, a rheological modifier (surface-modified fumed silica) available from Evonik. Ingredients b4-6: Yellow M2R 70, which is Pigment Yellow 139 available from Clariant.

[0095] Preparation of Examples 1-8 (Ex.1~8) and Preparation of Comparative Examples 1-9 (CEx.1~9) The specific amounts and types of components in the bio-based two-component polyurethane adhesive compositions of Examples 1-8 and Comparative Examples 1-9 based on the present invention are shown in Tables 1-4 below. The compositions were prepared as follows:

[0096] Preparation of a bio-based polyurethane prepolymer (b1): Place component b-1 and, if used, b-2 in a 750 mL reaction vessel; heat the reaction mixture to 80°C for 2 hours with stirring at 90 rpm and under a vacuum of 50 mbar to dehydrate it; add component b-3 to the reaction vessel; and heat the mixture obtained from the above at 80°C for 1 hour. Includes,

[0097] (1) Preparation of component (A), as follows: In a mixing cup, mix all liquid components, including components (a1), (a2), and (a3), and component a7-1 if used, at 1500 rpm for 2 minutes using a speed mixer DAC 600 VAC-P; add component (a5) and, if used, a7-5 to the mixing cup and mix the resulting mixture with the speed mixer at 1500 rpm for 2 minutes; then, add components (a4) and (a6), and, if used, components a7-2, a7-3, a7-4, and a7-6 to the mixing cup and further stir the resulting mixture with the speed mixer at 1500 rpm at 100 mbar or less for 5 minutes; and remove air bubbles by centrifuging at 765 g for 3 minutes; Preparation including,

[0098] (2) Preparation of component (B), as follows: In a mixing cup, mix all liquid components, including components (b1) and (b2), and, if used, components b4-1, b4-2, and b4-3, at 1500 rpm for 2 minutes using a speed mixer DAC 600 VAC-P; add component (b3) to the mixing cup and mix the resulting mixture at 1500 rpm for 2 minutes using a speed mixer; if used, add components b4-4, b4-5, and b4-6 to the mixing cup and further stir the resulting mixture at 1500 rpm for 5 minutes at a rate of 100 mbar or less using a speed mixer; and remove air bubbles by centrifuging at 765 g for 3 minutes; Preparation including Prepared by [method].

[0099] Test method: Regarding the uncured product of the composition: The low shear viscosity of components (A) and (B) of the above composition was measured by shearing each component for 3 minutes at 25°C and a spindle rotation speed of 1 / sec using a CP-25-2 spindle on an MCR-302 rheometer available from Anton Paar, and then reading the viscosity value in units of Pa.s.

[0100] The high shear viscosity of components (A) and (B) of the above composition was measured by shearing each component for 3 minutes at 25°C and a spindle rotation speed of 10 / sec using a CP-25-2 spindle on an MCR-302 rheometer available from Anton Paar, and then reading the viscosity value in units of Pa.s.

[0101] The thixotropy indices of components (A) and (B) of the above composition were calculated as the low-shear viscosity / high-shear viscosity values ​​of the corresponding components. In the present invention, it is desirable that the thixotropy indices of components (A) and (B) of the bio-based two-component polyurethane adhesive composition be greater than 5.

[0102] Each of the components (A) and (B) of the above composition was placed in a transparent container, their color was observed visually, and then their appearance after vibration was observed visually.

[0103] Regarding the cured product of the composition: Components (A) and (B) of each of the above compositions were placed in a 1:1 two-component Mixpac 200 mL adhesive tube, then mixed in an MGQ 10-19-95 static mixer. The resulting mixture was then visually observed for its color, and subsequently its appearance after vibration.

[0104] The lap shear strengths of each cured product of the above compositions were measured as follows, based on the GB / T 7124-2008 standard: Alu3003 / Alu3003, Alu6063 / Alu6063, and Alu6060 / SS301:

[0105] Base material used: Alu3003: 3003 aluminum plate with dimensions of 25mm x 100mm x 2mm. Alu6063: 6063 aluminum plate with dimensions of 25mm x 100mm x 2mm. Alu6060: 6060 aluminum plate with dimensions of 25mm x 100mm x 2mm. SS301: SS301 stainless steel sheet with dimensions of 25mm x 100mm x 2mm.

[0106] All of the above substrates were wiped with ethanol to remove dust and dirt before use.

[0107] Components (A) and (B) of each of the above compositions were placed in a 1:1 two-component Mixpac 200 mL adhesive tube and then mixed in an MGQ 10-19-95 static mixer. The resulting mixture was applied to the edge of a substrate, another substrate was placed on top of the mixture under pressure, and then the two substrates were secured with clips to obtain a sample. The sample was cured at room temperature for 4 hours, then placed in an 80°C oven for 12 hours to accelerate curing, and then the sample was removed from the oven.

[0108] The lap shear strength of the sample was tested using a ZwickRoell universal tester with a preliminary tensile force of 5N and a tensile speed of 5mm / min. The fracture strength was recorded as the strength at which the sample was stretched until it broke.

[0109] In the present invention, it is desirable that the two-component bio-based polyurethane adhesive composition exhibits a lap shear strength greater than 15 MPa with Alu3003 / Alu3003, a lap shear strength greater than 18 MPa with Alu6063 / Alu6063, and a lap shear strength greater than 18 MPa with Alu6060 / SS301.

[0110] The bio-based content of each composition was calculated using the following formula:

number

[0111] Bio-based content of the nth organic component in TIFF2026528116000002.tif633

[0112] Weight percentage of the nth organic component in the composition TIFF2026528116000003.tif627

[0113] In the present invention, it is desirable that the bio-based content of the two-component bio-based polyurethane adhesive composition be 40% or more.

[0114] All parameters of the above compositions were tested and calculated using the methods described above, and the results are shown in Tables 1 to 4 below.

[0115] [Table 1]

[0116] [Table 2]

[0117] Note: All "-" symbols used here indicate that the corresponding component is not present or that the corresponding result was not tested.

[0118] [Table 3]

[0119] [Table 4]

[0120] [Table 5]

[0121] [Table 6]

[0122] [Table 7]

[0123] [Table 8]

[0124] The data in Tables 1 and 2 show that the bio-based two-component polyurethane adhesive compositions (Examples 1-8) based on the present invention, using specific combinations of components (A) and (B), have a high bio-based content and exhibit excellent adhesion to various untreated (or untreated) metal substrates. In particular, all of the bio-based two-component polyurethane adhesive compositions in Examples 1-8 had a bio-based content of 40% or more, and the lap shear adhesive strength of Alu3003 / Alu3003 was greater than 15 MPa, the lap shear adhesive strength of Alu6063 / Alu6063 was greater than 18 MPa, and the lap shear adhesive strength of Alu6060 / SS301 was also greater than 18 MPa.

[0125] Furthermore, a comparison reveals that while Example 7 differs from Example 4 only in that it contains component (a5-3) instead of component (a5-1), the viscosity of all components (A) and (B) in Example 7 was much higher than in Example 4. Therefore, Example 7 was less suitable as a corner joint adhesive than Example 4. Accordingly, in the present invention, the inorganic filler (a5) is preferably heavy calcium carbonate compared to ultrafine silica powder.

[0126] In contrast, the data in Tables 3 and 4 show that bio-based two-component polyurethane adhesive compositions not based on the present invention (Comparative Examples 1-9) either failed to achieve a high bio-based content or simultaneously failed to exhibit excellent adhesion to various untreated (or untreated) metal substrates. For example, Comparative Examples 1, 2, and 8 (without component (a2)) all had a lap shear strength of less than 15 MPa on Alu3003 / Alu3003. Both Comparative Examples 3 and 4 (containing polyolefin resin instead of component (a1)) had a bio-based content far below 40%, and their lap shear strengths on Alu3003 / Alu3003 were far below 15 MPa, on Alu6063 / Alu6063 were far below 18 MPa, and on Alu6060 / SS301 were far below 18 MPa. Comparative Examples 5, 6, and 7 (whose content of component (a2) was not within the scope of the present invention, being 0.5% by weight, 10% by weight, and 20% by weight, respectively) had a lap shear strength of less than 15 MPa with Alu3003 / Alu3003, and both Comparative Examples 6 and 7 had a lap shear strength of less than 18 MPa with Alu6063 / Alu6063 and less than 18 MPa with Alu6060 / SS301.

[0127] Furthermore, Comparative Example 9 (where both components (a5) and (b3) were heavy calcium carbonate and the rheology modifier was simply fumed silica) had a lap shear strength of less than 15 MPa in Alu3003 / Alu3003.

[0128] Part II. Settlement volume of the solid component (A) The specific amounts and types of components in component (A) of Examples 1, 9, and 10 based on the present invention are shown in Table 5 below. Component (A) was prepared by the general method of Part I.

[0129] In Examples 1, 9, and 10, component (A) was placed in a glass bottle, 30 g of ethanol was added to the glass bottle, and the resulting mixture was stirred and vibrated ultrasonically for 30 minutes to completely dissolve component (A) in the ethanol. The mixture was then transferred to a 50 mL centrifuge tube and centrifuged at an acceleration of 765 g for 10 minutes. Finally, the sedimentation volume of the solid was read and compared.

[0130] The settling volume of the solid component (A) described above was tested using the method described above, and the results are shown in Table 5 below.

[0131] [Table 9]

[0132] From the data in Table 5, it can be seen that the solid sedimentation volume of component (A) in the present invention is preferably 15 to 30 mL / g, more preferably 20 to 25 mL / g.

[0133] While several preferred embodiments have been described, many modifications and variations are possible considering the teachings above. Therefore, it should be understood that the present invention can be implemented in ways different from those specifically described without departing from the scope of the appended claims.

Claims

1. A bio-based two-component polyurethane adhesive composition comprising component (A) and component (B), Ingredient (A) is as follows: (a1) Based on the total weight of component (A), 20 to 40% by weight of natural oil-based polyols, (a2) Based on the total weight of component (A), 0.75 to 7.5% by weight of liquid bio-based phenolic resin, (a3) Based on the total weight of component (A), 1 to 10% by weight of modified castor oil polyester and / or trifunctional polyether and / or polyfunctional polyester polyol having 2 or more functional groups, and (a5) 20 to 50% by weight of inorganic filler based on the total weight of component (A) It includes the following component (B): (b2) Based on the total weight of component (B), a polyfunctional polyisocyanate with 2 or more functional groups in an amount of 5 to 20% by weight, and (b3) 20 to 50% by weight of inorganic filler based on the total weight of component (B) Includes, At least 40% by weight, preferably at least 45% by weight, of all organic components in the composition are bio-based materials. The composition is a bio-based two-component polyurethane adhesive composition, further comprising 2 to 25% by weight of a rheology modifier in component (A) and / or component (B), based on the total weight of the composition.

2. Component (a1) is selected from the group consisting of castor oil-based polyols, lechesterella oil-based polyols, soybean oil-based polyols, coconut oil-based polyols, cochin oil-based polyols, corn oil-based polyols, cottonseed oil-based polyols, linseed oil-based polyols, olive oil-based polyols, palm oil-based polyols, palm kernel oil-based polyols, peanut oil-based polyols, sunflower oil-based polyols, tall oil-based polyols, animal fat-based polyols, tung oil-based polyols, whale oil-based polyols, tea seed oil-based polyols, sesame oil-based polyols, safflower oil-based polyols, rapeseed oil-based polyols, fish oil-based polyols, any derivatives thereof, and any combination thereof, and is preferably a castor oil-based polyol, the bio-based two-component polyurethane adhesive composition according to claim 1.

3. The bio-based two-component polyurethane adhesive composition according to claim 1, wherein component (a2) is a cashew nut shell oil-based phenolic resin.

4. The bio-based two-component polyurethane adhesive composition according to claim 1, wherein the amount of component (a2) is 1 to 5% by weight, preferably 2 to 4.5% by weight, based on the total weight of component (A).

5. The bio-based two-component polyurethane adhesive composition according to claim 1, wherein component (B) further comprises 20 to 45% by weight of a bio-based polyurethane prepolymer (b1) based on the total weight of component (B), preferably component (b1) is obtained from a bio-based polyol and an isocyanate, and more preferably component (b1) has an isocyanate content of 10 to 25% by weight based on the weight of the prepolymer.

6. The bio-based two-component polyurethane adhesive composition according to claim 1, wherein when both component (a5) and component (b3) are heavy calcium carbonate, the rheology modifier is a combination of precipitated calcium carbonate and fumed silica.

7. The bio-based two-component polyurethane adhesive composition according to claim 1, wherein component (A) comprises 0.1 to 1% by weight of (a6) adhesion promoter, preferably silane, more preferably mercaptosilane, based on the total weight of component (A).

8. The bio-based two-component polyurethane adhesive composition according to claim 1, wherein component (A) further comprises (a4) a catalyst and / or (a7) at least one component selected from the group consisting of chain extenders, rheology modifiers, moisture scavengers and pigments.

9. The bio-based two-component polyurethane adhesive composition according to claim 1, wherein component (B) further comprises at least one component selected from the group consisting of (b4) plasticizers, moisture scavengers, rheology modifiers, and pigments.

10. The bio-based two-component polyurethane adhesive composition according to claim 1, wherein component (A) contains a pigment representing a first color, component (B) contains a pigment representing a second color, and a mixture obtained by mixing components (A) and (B) represents a third color, and the first color, second color, and third color are different from each other.

11. The bio-based two-component polyurethane adhesive composition according to claim 1, wherein the volume ratio of component (A) to component (B) is 3:1 to 1:3, preferably 2:1 to 1:2, more preferably 1.5:1 to 1:1.5, and most preferably 1.1:1 to 1:1.

1.

12. The following steps: (1) A step of preparing component (A), comprising: mixing all liquid components, including components (a1), (a2), and (a3), and, if used, a chain extender, to obtain a mixture; mixing component (a5) and, if used, a moisture scavenger, to the mixture obtained above; then adding components (a4) and (a6), if used, a rheological modifier and / or pigment, if used, to the mixture and further mixing the resulting mixture; and removing any air bubbles therein; Steps including, (2) A step of preparing component (B), comprising: mixing all liquid components, including components (b1), (b2), and, if used, a plasticizer and / or moisture scavenger, to obtain a mixture; mixing component (b3) into the mixture obtained above; adding rheological modifiers and / or pigments to the mixture as needed, if used, and further mixing the resulting mixture; and removing any air bubbles therein; Steps including A method for preparing a bio-based two-component polyurethane adhesive composition according to any one of claims 1 to 11, comprising the above.

13. The following steps: A method for joining a corner joint using a bio-based two-component polyurethane adhesive composition according to any one of claims 1 to 11, comprising the steps of: mixing component (A) and component (B) according to any one of claims 1 to 11 to produce an uncured product; injecting the uncured product into a corner cavity; and curing the uncured product.

14. A cured product obtained from a bio-based two-component polyurethane adhesive composition according to any one of claims 1 to 11.

15. Use of the bio-based two-component polyurethane adhesive composition according to any one of claims 1 to 11 for bonding metals, marbles, ceramic tiles, wood, and surface-treated plastics, and especially for bonding untreated (or unprocessed) metal substrates, such as window profiles and corner joint cleats.

16. The use according to claim 15, wherein the composition is used as an adhesive for corner joints in doors and windows, particularly in aluminum and / or steel doors and windows, for example in door frames and window frames.