Urethane Acrylate Nail Coating Adhesion Flexibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing nail coating compositions face issues with adhesiveness, curability, and flexibility, leading to chipping, cracking, or detachment upon external force application, and poor external appearance.
Innovation Solution
A curable resin composition comprising a urethane structure with acrylic functional groups, an acrylic functional group-containing compound with an aliphatic ring structure, and a photopolymerization initiator, which provides excellent adhesiveness, curability, and flexibility, preventing defects and detachment from nails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional lacquer coating materials are used, then the coating provides good gloss and quick drying, but the adhesiveness to natural nails is poor causing easy peeling and detachment
Solution Approach 1:
The patent changes the chemical composition parameters by using a curable resin system with specific ratios of urethane acrylate (60-80 parts), hydroxyl group-containing acrylic monomer (10-30 parts), and photopolymerization initiator (0.1-5 parts). This chemical parameter modification enables the coating to achieve both quick application/drying and strong adhesiveness through photopolymerization curing, resolving the contradiction between ease of application and reliability of adhesion.
2Reliability
If curable composition materials are used to improve adhesiveness, then the cured product has high hardness, but the cured product becomes prone to chipping and cracking under external force
Solution Approach 1:
The patent optimizes the molecular weight parameter of the urethane acrylate to 5500-8000 and adjusts the ratio of hydroxyl group-containing acrylic monomer (10-30 parts) to control the crosslinking density. This parameter optimization ensures sufficient adhesiveness through photopolymerization while maintaining flexibility and resistance to chipping and cracking under external force, resolving the contradiction between adhesion strength and flexibility.
Solution Approach 2:
The patent creates a composite resin system combining urethane acrylate with hydroxyl group-containing acrylic monomer and other functional components in specific proportions. This composite material approach allows the coating to achieve both high adhesiveness and flexibility by leveraging the complementary properties of different resin components, preventing chipping and cracking while maintaining strong bond to nails.
3Reliability
If existing curable compositions are used, then adhesiveness and curability are improved, but the external appearance is poor
Solution Approach 1:
The patent optimizes the molecular weight parameter of urethane acrylate to 5500-8000 and adjusts the composition ratios to achieve proper viscosity and flow characteristics. These parameter changes enable the coating to not only achieve good adhesiveness and curability through photopolymerization but also produce a smooth, aesthetically pleasing external appearance without defects, resolving the contradiction between reliability and appearance quality.
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 achieves high adhesiveness and curability while maintaining flexibility, ensuring reliable and aesthetically pleasing nail coatings that resist external stimuli without chipping or peeling.
Implementation Method 1
a curable resin composition for coating nails, which comprises: (A) 100 parts by mass of a compound having a urethane structure in molecule and containing acrylic functional groups at both terminals of a molecular chain; (B) 1 to 35 parts by mass of an acrylic functional group-containing compound having the following chemical structure... (E) 0.5 to 13.5 parts by mass of a photopolymerization initiator
Data Source
AI summary
Using a curable resin composition including the following (A) to (E) configurations, which is excellent in adhesiveness to nails and curing reactivity, and a cured product of which has a certain flexibility, makes it possible to form a coating aiming for protection, decoration, and the like of nails with favorable followability to the nails: (A) 100 parts by mass of a polymer having a urethane structure in molecule and containing acrylic functional groups at both terminals of a molecular chain, (B) 1 to 35 parts by mass of a trifunctional acrylic functional compound of a specific structure, (C) 15 to 75 parts by mass of a compound containing an acrylic functional group having an aliphatic ring structure, (D) 1 to 35 parts by mass of a compound containing an acrylic functional group having an aliphatic chain structure, and (E) 0.5 to 13.5 parts by mass of a photopolymerization initiator.