Curable Composition with Blocked Hydroxyl Plasticizer
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Solution Overview
Problem
Curable compositions based on polyurethanes or silane-modified polymers used in construction often fail to effectively bond or seal alkaline substrates like fresh concrete due to hydrolysis reactions, leading to unpleasant odor emissions and migration issues.
Innovation Solution
A curable composition incorporating a polyether with blocked hydroxyl groups as a plasticizer, which is odor-neutral and non-migratory, ensuring stable and elastic bonding or sealing without odor emissions on alkaline substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional plasticizers (fatty alcohol dicarboxylic esters) are used in curable compositions on alkaline substrates, then the composition provides good plasticizing effect and flexibility, but hydrolysis reactions occur under alkaline conditions releasing fatty alcohols that cause unpleasant odor emissions and migration
Solution Approach 1:
The patent changes the chemical structure parameter of the plasticizer from traditional fatty alcohol dicarboxylic esters to polyether having blocked hydroxyl groups. This parameter change fundamentally alters the chemical behavior under alkaline conditions - the blocked hydroxyl groups prevent hydrolysis reactions that release odorous fatty alcohols, while the polyether structure maintains plasticizing effect and flexibility through its molecular architecture and interaction with the polymer matrix.
Solution Approach 2:
The patent employs a composite approach by using polyether as the base structure with blocked hydroxyl groups incorporated into the molecular structure. This composite molecular design combines the beneficial properties of polyether (chemical stability, flexibility) with the functional benefit of blocked hydroxyl groups (resistance to alkaline hydrolysis), creating a plasticizer that simultaneously achieves good operation characteristics and eliminates harmful odor emissions.
2Ease of operation
If traditional plasticizers are used in curable compositions, then the composition achieves desired flexibility and processability, but the plasticizers tend to migrate and separate causing sticky surfaces and formation of spots on substrates
Solution Approach 1:
The patent changes the molecular parameter from small-molecule fatty alcohol esters to polyether structures with blocked hydroxyl groups. This parameter change increases molecular weight and complexity, which significantly reduces mobility and tendency to migrate. The polyether structure maintains processability and flexibility through its elastic nature and interaction with the polymer matrix, while the blocked hydroxyl groups provide chemical stability that prevents separation and spot formation.
Solution Approach 2:
The patent replaces traditional small-molecule plasticizers that are prone to migration and degradation with polyether structures that offer long-term stability. The blocked hydroxyl groups create a chemically stable structure that resists hydrolysis and degradation, ensuring the plasticizer remains in place and maintains its function over time without causing sticky surfaces or spots.
3Productivity
If curable composition is applied on fresh concrete or cement mortar, then the composition can be applied immediately without aging or pretreatment to save time and money, but hydrolysis reactions occur under alkaline conditions leading to odor emissions
Solution Approach 1:
The patent changes the chemical parameter of the plasticizer to polyether with blocked hydroxyl groups, which fundamentally alters the chemical stability under alkaline conditions. This parameter change enables immediate application on fresh concrete or cement mortar without aging or pretreatment because the blocked hydroxyl groups prevent hydrolysis reactions that would otherwise release odorous fatty alcohols, thus maintaining productivity while eliminating harmful emissions.
Solution Approach 2:
The patent converts the potentially harmful interaction between traditional plasticizers and alkaline substrates into a beneficial situation by using polyether with blocked hydroxyl groups. The blocked hydroxyl groups are specifically designed to resist alkaline hydrolysis, transforming what would be a harmful chemical reaction into a stable, odor-free system that allows immediate application on fresh concrete or cement mortar.
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 use of polyether with blocked hydroxyl groups in the curable composition provides stable, odor-free, and non-migratory properties, enabling reliable bonding or sealing of alkaline substrates like fresh concrete without the issues of hydrolysis-related odor emissions.
Implementation Method 1
In the boundary layer, hydrolysis reactions of constituents of the curable composition can occur under the alkaline conditions
Data Source
AI summary
Methods of using a curable composition, the curable composition including at least one polyether having blocked hydroxyl groups as the plasticizer on at least one alkaline substrate. The curable composition is storage-stable, easy to handle and highly elastic after curing, and does not show any tendency to separate or migrate. It enables elastic bonding, sealing or coating of alkaline substrates, such as, in particular, fresh or green concrete or cement mortar, without occurrence of troublesome odors triggered by plasticizer hydrolysis.