EP2895520A1

EP2895520A1 - Two-component polyurethane compositions, in particular suitable for use as viscoplastic structural adhesives

Info

Publication number: EP2895520A1
Application number: EP13763008.3A
Authority: EP
Inventors: Steffen Kelch
Original assignee: Sika Technology AG
Current assignee: Sika Technology AG
Priority date: 2012-09-14
Filing date: 2013-09-06
Publication date: 2015-07-22
Also published as: US20150247073A1; US9809732B2; BR112015005679A2; JP6235593B2; CN104755519A; JP2015535862A; EP2708565A1; CN104755519B; WO2014040916A1

Abstract

The invention concerns a two-component polyurethane composition consisting of a polyol component K1 and a polyisocyanate component K2, the polyol component K1 comprising castor oil A1 and 1, 2, 3-propane triol A2, and the polyisocyanate component K2 comprising at least one aromatic polyisocyanate B1, the ratio in weight percent of (A1/A2) being between 4 and 50 and the ratio of all NCO groups of the aromatic polyisocyanates B1 to all the OH groups totalling (A1+A2) = 1.15 : 1 - 85 : 1, and the total of all the OH groups of (A1+A2) being > 93 % of the total of all the OH groups of the two-component polyurethane composition. The claimed adhesive composition is characterized by controllable hydrolytic degradability.

Description

TWO-COMPONENT POLYURETHANE COMPOSITIONS, ESPECIALLY SUITABLE FOR USE AS TOOTH-ELASTIC,

STRUCTURAL ADHESIVES Technical area

The invention relates to the field of two-component polyurethane compositions, in particular the tough-elastic structural two-component polyurethane adhesives with adjustable hydrolytic

Degradability.

State of the art

Two-component polyurethane adhesives based on polyols and polyisocyanates have been used for a long time. Two-component polyurethane adhesives have the advantage that they cure quickly after mixing and therefore can absorb and transmit high forces quickly after a short time. For use as structural adhesives, however, high demands are placed on such adhesives in terms of strength and ductility, since such adhesives represent elements of load-bearing structures.

There is a particular desire for adhesives, the high

Strengths in the sense of structural bonding and yet have a high elasticity and in addition hydrolytically degradable, in particular controlled hydrolytically degradable, are. Presentation of the invention

Object of the present invention is therefore, a

To provide a two-component polyurethane composition, in particular a structural two-component polyurethane adhesive, which at the same time has a high elongation at high strength and is controlled hydrolytically degradable. This is done by the

two-component polyurethane composition according to claim 1 allows. Surprisingly, with the inventive

two-component polyurethane composition, a high strength of the cured material achieved without losing the elasticity.

Further aspects of the invention are the subject of further independent claims. Particularly preferred embodiments of the invention are the subject of the dependent claims.

Ways to carry out the invention

The present invention relates to a two-component

Polyurethane composition consisting of a polyol component K1 and a polyisocyanate component K2;

wherein the polyol component K1

Castor oil A1, and

1,2,3-propanetriol A2, comprising

and wherein the polyisocyanate component K2

at least one aromatic polyisocyanate B1, wherein the ratio of the wt .-% of (A1 / A2) 4-50, wherein the ratio of all NCO groups of the aromatic polyisocyanates B1: all OH groups of the sum of (A1 + A2) = 1, 15: 1 - 0.85: 1 and wherein the sum of all OH groups of (A1 + A2)> 93% of the sum of all OH groups of the two-component polyurethane composition.

The term "hydrolytically degradable" is used herein

Document a degradation by hydrolysis understood, so a chemical reaction in which a compound is split by the action of water, as described in CD Römpp Chemie Lexikon, Version 1 .0, Thieme Verlag.

Preferred is a hydrolytic degradability which, when stored in demineralized water at a temperature of 40 ° C over a period of 60 days to a weight loss of the cured composition of> 0.8 wt .-%, in particular> 1 wt .-%, particularly preferred > 2% by weight, most preferably> 4% by weight. Of the Weight loss is measured after drying the composition under vacuum until constant weight is achieved, expressed as a percentage of the weight of the cured composition prior to storage in demineralised water.

The prefix "poly" in substance names such as "polyol", "polyisocyanate", "polyether" or "polyamine" indicates in this document that the respective substance formally contains more than one functional group per molecule occurring in its name The present polyol component K1 comprises castor oil A1

Castor oil may contain traces of water. In particular, the water content in the castor oil is <5% by weight, preferably <1% by weight, particularly preferably <0.5% by weight.

The term "castor oil" (also known as castor oil or castor oil) is understood to mean in particular castor oil in the present document, as described in CD Römpp Chemie Lexikon, Version 1 .0, Thieme Verlag.

Suitable castor oils are also commercially available, for example, under the trade name Alberdingk® Castor Oil Low Acid 0.7 from Alberdingk Boley, Germany or under the trade name # 1 Grade Castor Oil from Vertellus Specialties Inc, USA.

Preferably, castor oil is a naturally renewable raw material and is extracted from the seed of the castor bean (Ricinus communis,

Wolf milk plant) won. The castor oil can be used raw or purified. The use of castor oil with a reduced content of free fatty acids (low FFA castor oil) has proved particularly suitable. Preferably castor oil with a content of free fatty acids of less than 5 wt .-%, in particular between 1 and 4 wt .-%, is used. This is to the advantage of that thereby a better

Networking is obtained.

The polyol component K1 comprises 1,2,3-propanetriol (also called glycerol) A2. Suitable 1,2,3-propanetriols are, for example, commercially available from ecoMotion GmbH, Germany. The present polyisocyanate component K2 comprises at least one aromatic polyisocyanate B1.

Suitable aromatic polyisocyanates B1 are in particular monomeric di- or triisocyanates, as well as oligomers, polymers and derivatives of monomeric di- or triisocyanates, as well as any mixtures thereof.

Suitable aromatic monomeric di- or triisocyanates are in particular 2,4- and 2,6-toluene diisocyanate and any desired mixtures of these isomers (TDI), 4,4'-, 2,4'- and 2,2'-diphenylmethane diisocyanate and any mixtures of these Isomeric (MDI), 1,3- and 1,4-phenylenediisocyanate, 2,3,5,6-tetramethyl-1,4-diisocyanatobenzene, naphthalene-1,5-diisocyanate (NDI), 3,3'-dimethyl- 4,4'-diisocyanatodiphenyl (TODI), dianisidine diisocyanate (DADI), 1,3,5-tris (isocyanatomethyl) benzene, tris (4-isocyanatophenyl) methane and tris (4-isocyanatophenyl) thiophosphate. Preferred aromatic monomeric di- or triisocyanates are derived from MDI and / or TDI.

Suitable oligomers, polymers and derivatives of said monomeric di- and triisocyanates are in particular derived from MDI and TDI. Of these, especially suitable are commercially available types of TDI oligomers such as Desmodur ^® IL (Bayer); continue to be suitable for

Room temperature liquid forms of MDI (so-called "modified MDI"), which are mixtures of MDI with MDI derivatives, in particular MDI carbodiimides or MDI uretonimines, known under

Trade names such as Desmodur ^® CD, Desmodur ^® PF, Desmodur ^® PC (all from Bayer), and mixtures of MDI and MDI homologs (polymeric MDI or PMDI), available under trade names such as Desmodur ^® VL, Desmodur ^® VL50, Desmodur ^® VL R10 , Desmodur ^® VL R20, Desmodur ^® VH 20 N and Desmodur ^® VKS 20F (all from Bayer), Isonate ^® M 309, Voranate ^® M 229 and Voranate ^® M 580 (all from Dow) or Lupranat ^® M 10 R (ex BASF ). In practice, the abovementioned oligomeric polyisocyanates are usually mixtures of substances having different degrees of oligomerization and / or chemical structures. They preferably have an average NCO functionality of 2.1 to 4.0. Preferred aromatic polyisocyanates B1 are MDI and / or TDI which have> 40% by weight of monomeric MDI and / or monomeric TDI, based on the total weight of MDI and / or TDI.

If the polyisocyanate B1 is MDI, in particular MDI comprising> 40% by weight of monomeric MDI, this is among others

to the advantage that thereby high tensile strength values, high

Tensile shear strength values and high E-modules can be achieved. Further, the use of MDI is conducive to rapid hydrolytic degradability.

If the polyisocyanate B1 is TDI, in particular TDI comprising> 40% by weight of monomeric TDI, this is among others

to the advantage that high break elongation values can be achieved.

The ratio of the weight% of (A1 / A2) is 4-50.

If the ratio of the weight% of (A1 / A2) <4, it is disadvantageous in that thereby the E-modulus is so high that the resulting cured compositions are not suitable as viscoelastic adhesives.

If the ratio of the weight% of (A1 / A2)> 50, it is disadvantageous in that thereby the E-modulus is so deep that the resulting compositions are not suitable as viscoelastic adhesives.

If the ratio of the weight% of (A1 / A2) is 30-4, in particular 20-4, particularly preferably 13-4, most preferably 8-4, this is advantageous in that high tensile strength values are thereby obtained.

If the ratio of the weight% of (A1 / A2) is 30-4, in particular

20-4, more preferably 13-4, most preferably 8-4, this is advantageous in that high E-modules are thereby obtained. When the aromatic polyisocyanate B1 is MDI and the ratio of the weight% of (A1 / A2) is 50-13, especially 50-20, it is advantageous in that high elongation at break values are obtained.

If the aromatic polyisocyanate B1 is TDI and the ratio of the weight% of (A1 / A2) is 30-4, in particular 13-4, this is advantageous in that high values of elongation at break are obtained. If the ratio of the weight% of (A1 / A2) is 30-4, in particular

20-4, more preferably 13-4, most preferably 8-4, this is conducive to faster hydrolytic degradability.

If the ratio of the wt .-% of (A1 / A2) 30-8, so this is a temporally constant and thus easily adjustable and controllable hydrolytic degradability beneficial.

If the ratio of the wt .-% of (A1 / A2) 8-4, this is an initial increased hydrolytic degradability, in particular an increased hydrolytic degradability within the first 15 days, beneficial. The ratio of all NCO groups of the aromatic polyisocyanates

B1: all OH groups of the sum of (A1 + A2) is 1, 15: 1 - 0.85: 1. Preferably, the ratio of all NCO groups of the aromatic polyisocyanates B1: all OH groups of the sum of (A1 + A2) 1, 1: 1 - 0.9: 1. The ratio described above is understood to mean the molar ratio of mentioned groups.

In the case of the two-component polyurethane composition, the sum of all OH groups of (A1 + A2) is> 93% of the sum of all OH groups of the two-component polyurethane composition. Rejects that

Polyol component K1 more than 7% OH groups (which are not from (A1 + A2)), based on the sum of all OH groups of the two-component polyurethane composition, so that leads to an insufficient hydrolytic degradability, as for example in Table 6 and FIG. 3 from example 50, with a value of about 8.6% (OH groups not derived from (A1 + A2)).

Preferably, in the case of the two-component

Polyurethane composition, the sum of all OH groups of (A1 + A2)> 95%, in particular> 98%, particularly preferably> 99%, most preferably> 99.5%, the sum of all OH groups of the two-component polyurethane composition. This is a better hydrolytic

Degradability beneficial.

Preferably, the two-part polyurethane composition is substantially free of OH groups which are not derived from (A1 + A2). The term "essentially free" in this case means that the sum of the OH groups which do not originate from (A1 + A2) is <5%, in particular <2%, particularly preferably <1%, most preferably <0.5%, based on the sum of all OH groups of the two-component polyurethane composition, which contributes to better hydrolytic degradability.

Preferably, the two-part polyurethane composition is substantially free of OH groups of the following substances:

- Polyether and / or polyester polyols.

- Low molecular weight polyols having a molecular weight of 120 to 3000 g / mol (except 1, 2,3-propanetriol), in particular;

Low molecular weight aliphatic triols having a molecular weight of 120 to 2000 g / mol (excluding 1, 2,3-propanetriol).

There are different types of such low molecular weight aliphatic triols. For example, they may contain urethane and / or urea and / or ether groups. The shape of the triole can be very different. For example, star-shaped or comb-shaped triols are possible. It is also possible that both primary and secondary hydroxyl groups are present in the triol. For example, mentioned low molecular weight aliphatic triols can be prepared from an aliphatic triisocyanate, in particular from an isocyanurate, which is formed from three diisocyanate molecules, in excess of aliphatic diols, in particular of

Polyetherdiols, optionally by further extension by means of aliphatic diisocyanates and aliphatic diols reach. Other exemplary low molecular weight aliphatic triols may be selected from low molecular weight aliphatic triols, such as

Trimethylolpropane or glycerol, and an aliphatic diisocyanate and subsequent reaction with an aliphatic diol can be obtained. Further exemplary low molecular weight aliphatic triols are products of an alkoxylation reaction of low molecular weight

aliphatic triols, such as trimethylolpropane or glycerol. low molecular weight diols having a molecular weight of 120 to 2000 g / mol.

low molecular weight polyols having 5 to 8 hydroxyl groups with a molecular weight of 120 to 3000 g / mol. Such polyols are typically sugar alcohols and sugar alcohol-based polyols having a corresponding number of OH groups, in particular pentitols or hexitols, or those based on

Disaccharides. It can also be used the corresponding sugars.

natural oils (excluding castor oil) and natural oils which are reaction products with ketone resins, in particular reaction products of castor oil with ketone resins, in particular those marketed, for example, by Bayer under the name Desmophen® 1 150 and by Cognis under the name Sovermol® 805. The term "natural oils" in this document refers to esters of fatty acids with glycerol which are liquid at 23 ° C. These esters are naturally occurring, but can also be produced by synthesis or by technical and biotechnological processes all carboxylic acids, their carboxyl groups are connected to saturated, unsaturated, branched or unbranched alkyl radicals having more than 9 carbon atoms.

Preferably, the two-part polyurethane composition is substantially free of aliphatic polyisocyanates. In this case, the term "substantially free" is understood to mean that the sum of the NCO groups which does not originate from B1 is <5%, in particular <2%, particularly preferably <1%, most preferably <0.5%, In the majority of cases, using aliphatic polyisocyanates, it is not possible to produce a cured product which is suitable as an adhesive In the case of Examples 15-24 and 30-34, it is not possible to obtain a cured product within a period of 7 days and to prepare test specimens therefrom.

Preferably, the proportion of the sum of castor oil A1 and 1,2,3-propanetriol A2 is> 90% by weight, in particular> 95% by weight, particularly preferably> 99% by weight, based on the total weight of the oil

Polyol component K1.

The proportion of the aromatic polyisocyanate B1 is preferably> 90% by weight, in particular> 95% by weight, particularly preferably> 99% by weight, based on the total weight of the polyisocyanate component K2.

The components K1 and K2 are advantageously formulated such that the volume ratio of component K1 and K2 is between 1: 3 and 3: 1, in particular between 1: 2 and 2: 1. This ratio is particularly preferably about 1: 1.

Both components K1 and K2 can, in addition to the other components already mentioned, as they are the expert from polyurethane chemistry ago knows, have. These can be present in only one component or in both. Examples of such additional constituents are solvents, plasticizers and / or extenders, fillers such as carbon black, chalk, talc, baryth, phyllosilicates, adhesion promoters such as in particular trialkoxysilanes, thixotropic agents such as amorphous silicas, drying agents such as zeolites and color pigments.

As the expert for polyurethane adhesives knows, care must be taken in the preparation of the components, in particular in the polyisocyanate component K2, that their constituents are as free as possible

Are water and the components are handled in the absence of moisture.

The components K1 and K2 are stored separately from each other before use and mixed together only at or just before use. The components are advantageously present in a package consisting of two separate chambers in such a way that the polyol component K1 is present in one chamber and the polyisocyanate component K2 in the other chamber. The components K1 and K2 are filled into the chambers of the packaging and sealed air and moisture-tight.

In a further aspect, the invention comprises a package consisting of a package having two separate chambers and a two-part polyurethane composition.

Preferred packages of this kind are, on the one hand, side-by-side double cartridges or coaxial cartridges, in which two tubular chambers are arranged side by side or one inside the other and are sealed in air and moisture-tight manner with pistons.

For applications in larger quantities, in particular for applications in industrial production, the components K1 and K2 are advantageously filled and stored in barrels or pails. In this case The components are conveyed via feed pumps via lines

Mixed apparatus metered in, as they are commonly used for two-component adhesives in industrial production.

In any package, it is important that at least the polyisocyanate component K2 be sealed in a hermetic and moisture-proof manner, so that both components remain stable over a long period, i. typically longer than 6 months, storable.

In another aspect, the invention includes a method of bonding.

The method of bonding comprises the following steps:

Mixing the previously described components K1 and K2,

Applying the mixed polyurethane composition to at least one of the substrate surfaces to be bonded,

- joining within open time,

- curing the polyurethane composition.

The mixing is typically done by static mixers or by means of dynamic mixers.

The mixed polyurethane composition is applied to at least one of the substrate surface to be bonded. The substrate to be bonded preferably comprises or consists of a biodegradable material. The term "biodegradable" is used in the present

Document in particular biological degradation understood as he is described in CD Römpp Chemie Lexikon, Version 1 .0, Thieme Verlag.

The substrate to be bonded preferably comprises or consists of an organic material, preferably a renewable one

organic material, more preferably a polysaccharide such as starch or cellulose based material or

renewable raw materials based polyester material. Preferably, it is a cellulose fiber fleece, paper or wood. Other possible substrates are metal, plastic, glass or ceramic or fiber-reinforced plastics.

Typically, there are two substrates which are to be glued. It is possible that the joining partner, i. the second substrate is identical or different from the first substrate. The adhesive application can take place on the first and / or the second joining partner. After adhesive application, the joining partners are joined within the open time.

Subsequently to the joining, the curing of the polyurethane composition takes place.

This results in a composite of the joining partners, wherein the adhesive connects these joining partners frictionally with each other.

From the method described above results in a bonded article, which in particular is a glued article comprising, as

Substrates, biodegradable material. Preferably, the substrates consist of more than 80% by weight of biodegradable material. Such an article is another aspect of the invention. The polyurethane composition is preferably as structural

Adhesive used. In a further aspect, the invention therefore comprises the use of a two-component polyurethane composition as an adhesive, in particular as a structural adhesive. Particularly preferred is the use as a hydrolytically degradable adhesive, in particular as a hydrolytically degradable structural adhesive.

Preferably, such a structural adhesive in the cured state at room temperature has a tensile strength of> 5 MPa, in particular of> 6 MPa. Preferably, a structural adhesive in the cured state at room temperature has an elongation at break of> 30%, in particular of> 60%. A structural adhesive in the cured state preferably has an E-modulus of> 10 MPa at room temperature. These mechanical values are measured as in the following

Examples are described. Typical examples of applications of the inventive

Polyurethane compositions are found in packaging and

Composite materials, in particular those based on organic

Materials, most preferably packaging and composites (eg honeycomb core sandwich panels) based on biodegradable materials. Here, the cured adhesive is part of a supporting structure and thus forms an important link on whose mechanical properties high demands are made. The present invention meets these high standards perfectly.

The polyurethane composition of the invention is characterized by a hydrolytic degradability, preferably a controlled hydrolytic degradability.

Examples

The compositions 2-6 and 11-14 exemplified in Table 1 are examples according to the invention, while the others are reference examples.

For the preparation of the components K1, the component A1

(or the non-inventive component A1 ') and, if present, the component A2 (or the non-inventive component A2' or A2 ") and 1 wt .-% (based on the total weight of component K1) of a drying agent (PURMOL ® molecular sieve, Zeochem AG, Switzerland), according to that indicated in Table 2

Weight ratio A1 / A2 gravimetrically weighed and mixed in a SpeedMixer® (DAC 150 FV, Hauschild) for 30 seconds at 3000 rpm.

In Example 50, in addition to component A1, non-inventive component A1 "in weight ratio A1 / A1" of 75/20 was also added.

Thereafter, the components K2 (B1 -1, B1 -2, or the non-inventive Β ', B ", Β'", B "") according to Table 2 were weighed gravimetrically to the components K1 and 30 seconds in the SpeedMixer at 3000 rpm mixed. The components K1 and K2 were mixed in the weight ratio of K1: K2 so that in each case an NCO / OH ratio of 1 .07 resulted. Thereafter, the cured curing composition was poured into 20 cm diameter Teflon dishes and sampled with a thickness of 2 mm.

In Table 2, the raw materials used (and those listed in Table 1) are marked by an "X", which were mixed as described above for Examples 1-50, For example, to prepare Example 2, 65.3 g of castor oil, 1.36 g 1, 2,3-propanetriol and 33.7 g MDI

(including 1 wt .-% of a 1% solution of a catalyst based on bismuth and zinc neodecanoate) used.

When cured, Examples 7-9 gave a brittle foam from which no samples could be made. In the case of Examples 15-24 and 30-34, it was not possible to obtain a cured product within a period of 7 days and to prepare test pieces therefrom. In Table 3, examples in which a specimen (P.k.) was prepared were marked with a (+). Examples in which no specimen (P.k.) was produced are marked with a (-).

measurements

The mixed components K1 and K2 were dumbbell-shaped according to ISO 527, Part 2, 1 B and cured for 24 h at 25 ° C and then for 3 h at 80 ° C.

After a conditioning time of 24 h at 25 ° C, modulus of elasticity became 1

(Expansion range 0.5-5%), modulus 2 (elongation range 0.05-0.25%), tensile strength (ZF) and elongation at break (BD) of the specimens thus produced according to ISO 527 on a Zwick Z020 tensile tester at a

Test temperature of 23 ° C and a test speed 200 mm / min measured. The results are shown in Table 3.

The blended components K1 and K2 were laminated to isopropyl alcohol degreased KTL-coated steel (ZSF1) 20 minutes after blending, respectively, to polyester material extruded into sheets (Ecoflex, Ecoflex F BX 701 1, BASF Germany (ZSF2) or Ecovio, Ecovio L BX 8145, BASF Germany (ZSF3)), in a layer thickness of 2.0 mm and applied to an overlapping adhesive surface of 20 x 45 mm and for 7 days at 23 ° C. and 50% humidity cured. The tensile shear strength was determined at a temperature of 23.0 ° C with a test speed of 20 mm / min according to DIN EN 1465. The results are shown in Table 3.

The hydrolytic degradation was carried out on samples with a thickness of 2 mm and a diameter of 20 mm in demineralised water at 40 ° C over a period of 60d. The samples to be examined were dried after removal from the water at 40 ° C and under vacuum until constant weight was reached. The results can be found in Tables 4-6. The values refer to the weight of the sample in% of

Initial value, i. the weight before the sample was placed in the demineralized water.

A1 castor oil, Alberdingk® Castor Oil Low Acid 0.7 from the company

Alberdingk Boley, Germany, OH number of 165

A reaction product of castor oil with ketone resin, Desmophen®

1 150, Viverso GmbH, Germany, OH number of 155

A1 "Novance PE 3451, polyol based on rapeseed oil, OH number of 76,

Novance, France

A2 1, 2,3-propanetriol, ecoMotion GmbH, Germany, OH number of

1880

A2 '1, 1, 1-trimethylolpropane (also called trimethylolpropane or 2- (hydroxymethyl) -2-ethylpropane-1,3-diol)

A2 "1,4-butanediol

B1 -1 MDI (45% monomeric MDI), 4,4'-, 2,4'-diphenylmethane diisocyanate,

Desmodur® VKS 20, Bayer Material Science, (including 1% by weight of catalyst ^* )

B1 -2 Monomeric TDI, 2,4- and 2,6-toluene diisocyanate, Aldrich, (inclusive

1% by weight of catalyst ^* ) B 'HDI trimer, Desmodur N 3300, Bayer Material Science, (including 1 wt% catalyst ^* )

B "HDI trimer, Desmodur N 3300, Bayer Material Science, (inclusive

1% by weight of catalyst ^** )

B '"Monomer IPDI, Vestanat IPDI, Evonik Degussa, (including 2% by weight of catalyst ^* )

B "" Monomer IPDI, Vestanat IPDI, Evonik Degussa, (without catalyst)

Table 1, raw materials used, ^* organometallic catalyst based on bismuth and zinc neodecanoate, 1% solution, ^**

organometallic catalyst based on bismuth and zinc neodecanoate, 35% solution.

Table 2 Zusannnnensetzungen, ^* it also be specified ratio values when instead of A1 are not inventive A1 'and A1', respectively, instead of B1, the noninventive B1 'and B1 ", were used.

P. K. ZF BD E-modul 1 E-modul 2 ZSF1 ZSF2 ZSF3

Example (+/-) [MPa] [%] [MPa] [MPa] [MPa] [MPa] [MPa]

1 + 2 52 3 2 1 .5 0.6 0.9

2 + 5 78 8 7 n.a. 0.8 1 .3

3 + 10 74 44 74 5 0.9 1 .5

4 + 10 60 87 126 n.a. 1 1 .5

5 + 10 32 138 212 n.a. 1 1 .5

6 + 13 17 233 413 n.a. n / A. n / A.

7-9 -

10 + 2 87 3 2 n.a. n / A. n / A.

1 1 + 2 105 3 3 n.a. n / A. n / A.

12 + 5 131 6 6 n.a. n / A. n / A.

13 + 6 1 15 1 1 14 n.a. n / A. n / A.

14 + 8 120 20 30 n.a. n / A. n / A.

15-24 -

25 + 2 35 n.a. 4 n.a. n / A. n / A.

26 + 3 37 n.a. 6 n.a. n / A. n / A.

27 + 3 29 n.a. 6 n.a. n / A. n / A.

28 + 4 27 n.a. 9 n.a. n / A. n / A.

29 + 5 21 n.a. 17 n.a. n / A. n / A.

30-34 -

35-46 + n.a. n / A. n / A. n / A. n / A. n / A. n / A.

47 + 5 87 9 12 n.a. n / A. n / A.

48 + 5 74 15 22 nanana 49 + nanananananana

50 + 3 86 6 10 n.a. n / A. n / A.

fabel e 3, measurement of mechanical properties, P.k. = Samples can be produced by body (+) or not (-), n.a. = not measured

a e, ea c tsust e under y roytsc on days (d)

Table 5, Measurement of weight loss at / under hydrolytic degradation in days (d)

aee, essing ewc tsverust e under y roytsc em au days (d) In the measurement of hydrolytic degradability, the following was found in Examples 35-49:

Examples 35-39, none of the 15d, 30d, 45d or 60d measurements reached <99.60%.

Examples 40-44, none of the 15d, 30d, 45d or 60d measurements reached <99.40%.

Examples 45-49, none of the 15d, 30d, 45d or 60d measurements reached <99.60%.

Claims

claims

1. Two-component polyurethane composition consisting of a polyol component K1 and a polyisocyanate component K2;

wherein the polyol component K1

Castor oil A1, and

1,2,3-propanetriol A2, comprising

and wherein the polyisocyanate component K2

at least one aromatic polyisocyanate B1, wherein the ratio of the wt .-% of (A1 / A2) 4-50, wherein the

Ratio of all NCO groups of the aromatic polyisocyanates B1: all OH groups of the sum of (A1 + A2) = 1, 15: 1 - 0.85: 1 and wherein the sum of all OH groups of (A1 + A2)> 93% , in particular> 95%, particularly preferably> 99%, the sum of all OH groups of the two-component polyurethane composition is.

Two-component polyurethane composition according to claim 1, characterized in that it is in the aromatic

Polyisocyanate B1 um

-MDI, which have> 40 wt .-% of monomeric MDI; and / or -TDI, which have> 40% by weight of monomeric TDI,

based on the total weight of MDI and / or TDI.

Two-component polyurethane composition according to claim 1 or 2, characterized in that the ratio of the wt .-% of (A1 / A2) 30-4, in particular 20-4, particularly preferably 13-4, most preferably 8-4, is.

Two-component polyurethane composition according to one of the preceding claims, characterized in that in the two-component polyurethane composition, the sum of the OH groups which do not originate from (A1 + A2), <5%, in particular <2%, particularly preferably <1%, most preferably <0.5%, is, based on the sum of all OH groups of the two-component polyurethane composition.

5. Two-component polyurethane composition according to one of the preceding claims, characterized in that in the two-component polyurethane composition, the sum of the NCO groups, which does not derive from B1, <5%, in particular <2%, particularly preferably <1%, most preferably < 0.5%, is, based on the sum of all NCO groups of

two-component polyurethane composition.

6. Two-component polyurethane composition according to one of the preceding claims, characterized in that the proportion of the sum of castor oil A1 and 1, 2,3-propanetriol A2> 90 wt .-%, in particular> 95 wt .-%, particularly preferably> 99 wt .-%, is based on the total weight of the polyol component K1.

7. Two-component polyurethane composition according to one of the preceding claims, characterized in that the proportion of the aromatic polyisocyanate B1> 90 wt .-%, in particular> 95

Wt .-%, particularly preferably> 99 wt .-%, based on the total weight of the polyisocyanate component K2.

8. A method of bonding comprising the steps

- Mixing of the polyol component (K1) and the polyisocyanate component

(K2) a two-component polyurethane composition according to any one of claims 1 to 7,

Apply the mixed polyurethane composition

at least one of the substrate surfaces to be bonded,

- Joining within open time

- curing the polyurethane composition.

9. The method according to claim 8, characterized in that the substrate to be bonded comprises an organic material, preferably a renewable organic material. 10. A bonded article which has been bonded by a process according to any one of claims 8 or 9.

1 1. Use of a two-component polyurethane composition according to one of claims 1 to 7 as an adhesive, in particular as a structural adhesive.

12. Use according to claim 1 1 as hydrolytically degradable

Adhesive.