Alkoxylation Products with Urethane Groups for Adhesive Stability
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Solution Overview
Problem
Conventional polyether alcohols and alkoxysilane compounds used in adhesives and sealants have limitations in terms of breaking stress and reactivity, leading to insufficient mechanical properties and stability.
Innovation Solution
The development of alkoxylation products produced through a process involving the reaction of polyether polyols with diisocyanates and a molecule of the formula H-M, which includes a hydrocarbon radical with oxygen radicals, resulting in compounds with improved storage stability and reduced toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyether alcohols are modified with alkoxysilane compounds to improve breaking stress, then the mechanical strength increases, but the storage stability decreases due to intrinsic reactivity
Solution Approach 1:
The patent extracts the reactive OH group from the molecule by converting it into a urethane group through reaction with isocyanate. This removes the source of intrinsic reactivity that causes premature crosslinking and storage stability issues, while preserving the alkoxysilyl groups for controlled crosslinking during curing
Solution Approach 2:
The patent changes the chemical state of the terminal group from hydroxyl (OH) to urethane (NH-CO-O) by controlling the isocyanate index. This parameter change reduces the reactivity of the terminal group, improving storage stability while maintaining the crosslinking capability of the alkoxysilyl groups
2Strength
If alkoxysilyl groups are distributed along the polyether chain to improve crosslinking, then the network formation enhances, but the reactivity becomes uncontrolled
Solution Approach 1:
The patent creates local quality differentiation by having non-terminal alkoxysilyl groups distributed along the polyether chain for crosslinking, while the terminal groups are converted to unreactive urethane groups. This spatial differentiation allows controlled reactivity - the internal silane groups provide crosslinking capability without the terminal OH groups causing uncontrolled premature reaction
3Ease of manufacture
If conventional polyether alcohols are used as starting compounds, then the production cost is low, but the mechanical properties are insufficient
Solution Approach 1:
The patent creates a composite molecular structure by combining polyether chains with embedded alkoxysilyl groups and terminal urethane groups. This composite structure integrates the low cost and flexibility of polyethers with the crosslinking capability of alkoxysilanes and the stability of urethane linkages, achieving improved mechanical properties while maintaining cost-effectiveness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting alkoxylation products exhibit enhanced breaking stress and storage stability, with the exclusion of water and moisture, and do not emit toxic substances, making them suitable for use in adhesive and sealant applications.
Implementation Method 1
the alkoxysilyl groups are hydrolysis-sensitive and can be crosslinked in the presence of water and/or moisture
Implementation Method 2
polyether polyols with diisocyanates and a molecule of the formula H-M... resulting in compounds with improved storage stability
Data Source
AI summary
Alkoxylation product (I), is new. Alkoxylation product of formula (M i(D1) jT kQ l(UR) u(AP) v) (I), is new. i : 2-16; either j : 1-10; and k : 0-6; or j+k : greater than 2; l : 0-4; u : 2-17; v : 0-6; M : hydrocarbyl having minimum molecular weight of 88 g/mole (containing O and optionally interrupted by heteroatoms); UR : -U1-D2-U1-; U1 : -C(O)-NH-, which is bonded to D2 through N; D2 : divalent hydrocarbyl; D1 : -(D3) t1-D4; t1 : 2; T : -(D3) t2-D4; t2 : 3; Q : -(D3) t3-D4, where M, D1, T and Q are not directly bonded with each other and are bonded through UR- and/or AP groups, and the UR- and the AP groups are not directly bonded with each other; t3 : 4; D4 : t-valent organic hydrocarbyl (optionally saturated, optionally branched and optionally containing O, S, Si and/or N); D3 : -(CH 2-CH(CH 2-O-(CH 2) h-Si((R2) f(O-R3) g))-O) a-(CH(R4)-C(R5) 2-O) b-(CH 2-CH(CH 2-O-R11)-O) c-(C(=O)-(C(R6)(R7)) e-O) d-; R1 : organic hydrocarbyl (optionally saturated, optionally branched and optionally containing O, S and/or N); R2, R3 : 1-8C alkyl; either R4 : H or 1-8C alkyl; and R5 : H, 1-20C alkyl, aryl or alkaryl; or R4+R5 : ring; R6, R7 : R5 or alkoxy; R11 : 1-24C alkyl (optionally saturated, optionally interrupted by O, and optionally substituted by carboxy, which is optionally esterified with alcohols e.g. methanol, ethanol, propanol, butanol or hexanol, OH, which is optionally esterified with acids e.g. acetic acid, acrylic acid, butyric acid or (meth)acrylic acid or polymers of (meth)acrylic acid), 6-20C aryl or 7-20C alkaryl; a, b, c, d : 0-1000, where the groups with the indices a, b, c, and d are freely permutable over the molecular chain; e : 1-10; g : at least 1; g+f : 3; h : 0-10; and AP : amide moieties of formula (IIIa) or (IIIb). Provided that when R1 does not carry substituents having alkoxysilyl groups and R1 is not directly substituted with alkoxysilyl groups, then a = >= 1; the different monomer units, the fragments with the indices a, b, c, and d, and the polyoxyalkylene chain of the substituent R1, are constructed in a blockwise manner with each other, or are subjected to a statistical distribution, and are freely permutable with each other. Independent claims are also included for: (1) preparing (I); and (2) a composition comprising (I). [Image].