Bismuth Curable Composition for Transparent X-Ray Shielding
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Solution Overview
Problem
Existing bismuth-containing materials for X-ray shielding have issues with solubility, polymerization, and mechanical properties, leading to colored and opaque products unsuitable for protective applications.
Innovation Solution
A curable composition containing a bismuth compound with a phosphoric acid ester having a (meth)acryloyl group and a nitrile compound with a radically polymerizable carbon-carbon double bond, along with optional salicylic acid or (meth)acrylic acid, to enhance solubility and form transparent, mechanically robust cured products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If bismuth or inorganic bismuth compound is directly kneaded into organic material, then X-ray shielding ability is achieved, but the material becomes colored and opaque and cannot be used for protective goggles
Solution Approach 1:
The patent changes the chemical parameters by coordinating organic groups (alkyl, aryl, polyethylene glycol chains) to bismuth, transforming it from an inorganic compound to an organometallic complex. This parameter change enables the material to maintain X-ray shielding ability while achieving transparency and colorlessness when used in curable compositions.
Solution Approach 2:
The patent creates a composite material system where bismuth-organic complex compounds are integrated into curable compositions containing polymerizable groups. This composite approach combines the X-ray shielding properties of bismuth with the optical clarity and mechanical properties of polymer matrices, resulting in transparent protective materials.
2Stability of the object's composition
If compound with organic group coordinated to bismuth is used to facilitate dispersion, then compatibility with organic material improves, but the compound has no polymerizable group and insufficient polymerization occurs
Solution Approach 1:
The patent merges two functional components: the bismuth-organic complex compound (providing dispersion compatibility and X-ray shielding) and polymerizable monomers (providing cross-linking and structural integrity). This combination ensures both complete polymerization and uniform bismuth dispersion throughout the cured product.
Solution Approach 2:
The patent uses polymerizable monomers as intermediaries that bridge the bismuth-organic complex and the final polymer network. These monomers contain both polymerizable groups (for cross-linking) and are compatible with the bismuth complex, enabling complete polymerization while maintaining uniform bismuth distribution.
3Reliability
If compound with polymerizable group such as (meth)acrylic acid coordinated to bismuth is used, then polymerization can occur, but solubility is insufficient and cured product has very low impact resistance
Solution Approach 1:
The patent changes the chemical structure parameters by using specific organic groups (polyethylene glycol chains, aryl groups) coordinated to bismuth instead of simple carboxylic acids. This structural modification improves solubility in organic materials and enables formation of cured products with high impact resistance while maintaining polymerization capability.
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 composition allows for high-concentration bismuth dispersion in organic materials, resulting in transparent, mechanically sound cured products with improved impact resistance and reduced coloring.
Implementation Method 1
a curable composition containing a bismuth compound in which a phosphoric acid ester having a (meth)acryloyl group is bonded to bismuth; and a nitrile compound having a radically polymerizable carbon-carbon double bond
Data Source
AI summary
The present invention provides: a curable composition which contains a bismuth compound, wherein a phosphoric acid ester having a (meth)acryloyl group is bonded to bismuth, and a nitrile compound having a radically polymerizable carbon-carbon double bond; a cured body which is obtained by curing this curable composition; a multilayer body which is composed of the above-described cured body and a cured body that is obtained by curing a photochromic curable composition; and a radiation protective material which is formed of the above-described cured body or the above-described multilayer body.