Halohydrin Crosslinking Agent for Safe Low-Temperature Resin Processing
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Solution Overview
Problem
Current water-absorbing resin crosslinking agents, such as those containing epoxy group-containing compounds, can cause skin irritation and do not adequately meet the need for high water absorption capacity, especially under body pressure in sanitary products like paper diapers.
Innovation Solution
A water-absorbing resin crosslinking agent containing a halohydrin compound with one halohydrin group, which effectively crosslinks water-absorbing resins at low temperatures to produce a water-absorbing agent with high water absorption capacity without skin-irritating functional groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If epoxy group-containing compounds are used as crosslinking agents, then water-absorbing resin particles can be crosslinked effectively, but skin irritation problems occur
Solution Approach 1:
The invention extracts and removes the harmful epoxy functional group from the crosslinking agent while retaining the essential crosslinking functionality. This is achieved by using halohydrin compounds that can crosslink water-absorbing resins without causing skin irritation, thus eliminating the harmful factor while preserving the useful function.
Solution Approach 2:
The invention employs halohydrin compounds as alternative crosslinking agents that are safer and more suitable for sanitary product applications. These compounds serve the crosslinking function effectively without the long-term harmful effects of epoxy groups, particularly in products that come into contact with skin.
2Quantity of substance
If conventional crosslinking agents are used, then water absorption capacity can be maintained, but higher water absorption capacity under body pressure cannot be achieved
Solution Approach 1:
The invention changes the chemical parameters of the crosslinking agent by using halohydrin compounds with specific molecular structures (containing halogen and hydroxyl groups). This parameter change enables the crosslinked resin to achieve superior water absorption capacity under body pressure while maintaining safety properties.
3Quantity of substance
If crosslinking is performed to increase water absorption capacity, then water absorption rate improves, but crosslinking temperature requirements increase process complexity
Solution Approach 1:
The invention changes the reactivity parameters of the crosslinking system by using halohydrin compounds that can crosslink at lower temperatures. This reduces the energy input required for crosslinking while achieving the desired water absorption capacity, thereby simplifying the production process.
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 halohydrin-based crosslinking agent provides a safe and effective means to produce water-absorbing agents with high water absorption capacity, maintaining performance under pressure, thus enhancing the functionality of sanitary products.
Implementation Method 1
crosslink the surface of water-absorbing resin particles with a crosslinking agent
Data Source
AI summary
The present invention aims to provide a water-absorbing resin crosslinking agent which is excellent in safety and which can effectively crosslink a water-absorbing resin at low temperatures to produce a water-absorbing agent having a high water absorption capacity. The present invention also aims to provide a water-absorbing agent produced by crosslinking a water-absorbing resin with the water-absorbing resin crosslinking agent, and a method for producing the water-absorbing agent. The present invention may include a water-absorbing resin crosslinking agent containing a halohydrin compound having one halohydrin group represented by the following formula (1) in its molecule:wherein A represents a single bond or an alkylene group; R1 represents a hydrogen atom or an alkyl group; and X represents a chlorine atom or a bromine atom.