Grafted Polycarboxylate Plasticizer Thermal Stability
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Solution Overview
Problem
Polyalkoxylated polycarboxylate plasticizer polymers exhibit low heat resistance and instability in oxidizing environments, leading to degradation and safety concerns during processing and storage, and existing stabilization methods are either costly or difficult to implement on an industrial scale.
Innovation Solution
Introducing anti-oxidant groups into the polymer chain through grafting reactions, allowing for homogeneous distribution and enhanced thermal stabilization, which enables stable powder formation and use without the need for inert gas environments during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyalkoxylated polycarboxylate plasticizer polymers are used, then dispersing efficiency and plasticizer performance are improved, but thermal stability and resistance to oxidation deteriorate
Solution Approach 1:
The patent applies composite materials by combining the polyalkoxylated polycarboxylate polymer with anti-oxidant agents (such as phenols, amines, phosphites, thioethers, or thioacids) to create a stabilized plasticizer composition. This composite approach allows the polymer to maintain its excellent dispersing efficiency while the anti-oxidant components provide thermal stability and resistance to oxidation, resolving the contradiction between performance and stability.
2Stability of the object's composition
If anti-oxidant agents are added to stabilize polymer powders, then thermal stability is improved, but emulsion instability and processing complexity increase
Solution Approach 1:
The patent uses anti-oxidant agents as intermediary substances that mediate between the polymer and the oxidizing environment. These agents are incorporated into the polymer composition during manufacturing, creating a pre-stabilized product that requires no additional processing or special handling during storage and use, thereby reducing processing complexity while maintaining thermal stability.
Solution Approach 2:
The anti-oxidant agents are incorporated into the polymer composition during the manufacturing process, before the product is put into service. This preliminary stabilization ensures that the polymer is protected against thermal degradation and oxidation from the outset, eliminating the need for complex processing precautions during subsequent storage and application.
3Ease of manufacture
If polymer powders are dried at high temperature to remove water, then powder formation is achieved, but polymer degradation and safety risks increase
Solution Approach 1:
The patent incorporates anti-oxidant agents into the polymer composition before drying and powder formation. These agents act as a protective cushion against thermal degradation during the high-temperature drying process, allowing the polymer to be converted into powder form without suffering oxidation damage or safety risks associated with thermal degradation.
4Stability of the object's composition
If inert gas atmosphere is used during powdering to prevent degradation, then polymer stability is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent enables the polymer to protect itself against oxidation and thermal degradation through the incorporation of anti-oxidant agents. This self-service capability eliminates the need for expensive inert gas atmospheres during powdering and storage, as the stabilized polymer can be processed and handled in normal atmospheric conditions without degradation.
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 grafted polymers demonstrate improved thermal stability, preventing degradation and maintaining dispersing efficiency, allowing for safe handling and storage, and can be incorporated into hydraulic binders without heat-induced degradation, reducing water demand and maintaining fluidifying effects.
Implementation Method 1
the chains of poly(alkylene oxide) tend to degrade by oxidation when they are exposed to high temperatures and/or to an oxidizing atmosphere
Implementation Method 2
anti-oxidant groups are introduced into the PCP polymer by a grafting reaction
Data Source
AI summary
The invention relates mainly to a polymer comprising a hydrocarbon-based main chain bearing carboxylic groups and polyalkoxylated chains and up to 4% by weight of anti-oxidant groups, relative to the weight of the final polymer, grafted to the main chain. It also relates to a method for preparing such a polymer and to an admixture which is of use as a plasticizer of suspensions of mineral particles comprising same. Finally, it is related to the use of such a polymer for fluidifying suspensions of mineral particles and reducing the water demand of hydraulic compositions.