Core-Shell Resin Impact Modifier for PMMA Transparency
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Solution Overview
Problem
Polymethylmethacrylate (PMMA) resin has low impact resistance, leading to thickness limitations and compromised transparency when using conventional impact modifiers, as they are not uniformly dispersed, affecting the resin's performance.
Innovation Solution
A resin composition with an occlusion seed of alkyl methacrylate and a crosslinker, a polymer core, and a polymer shell, where the rubber particles are occluded within the seed to enhance impact strength and transparency, allowing for controlled refractive index and morphology for improved performance as an impact modifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional impact modifiers are used to improve impact resistance of PMMA resin, then impact strength is improved, but transparency and hardness deteriorate due to non-uniform dispersion and excessive quantity required
Solution Approach 1:
The impact modifier is segmented into a core-shell structure where rubber particles are occluded within a resin seed core. This segmentation allows the impact modifier to be distributed more uniformly throughout the PMMA resin, improving impact strength without requiring excessive quantities that would compromise transparency.
Solution Approach 2:
The invention employs a nested structure where rubber particles are occluded inside the resin seed core, forming a core-shell configuration. This nesting allows the impact modifier to be contained within discrete units that disperse uniformly, maintaining transparency while providing impact enhancement.
2Strength
If quantity of impact modifier is increased to achieve satisfactory impact resistance, then impact strength is improved, but hardness and transparency deteriorate
Solution Approach 1:
The impact modifier is concentrated in specific localized regions (occluded within the seed core) rather than being uniformly distributed throughout the entire resin matrix. This local quality approach allows effective impact modification with smaller overall quantities, preserving the hardness and transparency of the PMMA resin.
3Strength
If impact modifier is added to improve impact resistance, then impact strength is improved, but uniformity of dispersion deteriorates leading to transparency loss
Solution Approach 1:
The rubber particles are occluded within the resin seed core during the seed formation stage, before the final resin matrix is formed. This preliminary action ensures that the impact modifier is pre-positioned in discrete, uniformly distributable units, preventing aggregation and ensuring uniform dispersion throughout the final product, thereby maintaining transparency.
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 resin achieves superior impact strength, transparency, and color, effectively addressing the limitations of conventional PMMA resin by optimizing the morphology and dispersibility of rubber particles, enabling its use as an excellent impact modifier for PMMA resin.
Implementation Method 1
a copolymer of aromatic vinyl compound and alkyl acrylate occluding the base seed
Implementation Method 2
including 99.95 to 99 wt % of alkyl methacrylate and 0.05 to 1 wt % of crosslinker
Data Source
AI summary
Disclosed is a resin having excellent impact resistance and color, and a method of preparing the same, and more specifically, a resin having the excellent impact resistance and color, and a method of preparing the same, in which the resin includes (a) an occlusion seed consisting of i) a base seed including 99.95 to 99 wt % of alkyl methacrylate and 0.05 to 1 wt % of crosslinker, and ii) a copolymer of aromatic vinyl compound and alkyl acrylate occluding the base seed; (b) a polymer core surrounding the occlusion seed; and (c) a polymer shell surrounding the core, and according to the present invention, it is effective in providing a resin having superior impact strength, transparency, and color, in which the resin can be used as an excellent impact modifier when applying on a polymethylmethacrylate resin, and a method of preparing the same.