Acryloyl Modified Polysiloxane Additive for UV Curing Coatings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional methods for preparing acryloyl oxygen alkyl modified polysiloxane for radiation curing systems face issues such as high energy consumption, self-polymerization of double bonds, and instability of Si—O—C bonds, complicating the production process and affecting the smoothness and durability of coatings.
Innovation Solution
A method involving hydrosilylation to produce acryloyl group containing acryloyl oxygen alkyl modified polysiloxane with polyether segments of varying HLB values, using a controlled synthesis process that reduces energy consumption and enhances compatibility with different radiation curing systems, including UV/EB paint and inks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hydrolytic condensation reaction is used to prepare acryloyl oxygen alkyl modified polysiloxane, then the product can be obtained, but hydrochloric acid is released requiring neutralization which complicates the production procedure
Solution Approach 1:
The patent extracts and eliminates the harmful byproduct generation step by using hydrosilylation reaction instead of hydrolytic condensation. The Si-H bond reacts directly with the vinyl group without releasing HCl, thereby removing the need for neutralization steps and simplifying the production procedure.
Solution Approach 2:
The patent converts the potentially harmful hydrolytic condensation process into a beneficial hydrosilylation process. By using the reactive Si-H bond to directly substitute the vinyl group, the method transforms a process that generates harmful HCl into one that produces only water as byproduct, turning a harmful chemical transformation into a clean reaction.
2Reliability
If chlorinated polysiloxane reacts with hydroxylated acrylic or trimethylolpropane acrylate to obtain acryloyl oxygen alkyl modified polysiloxane, then the product is obtained, but precipitation needs to be removed by filtration and the product contains unstable Si—O—C bonds
Solution Approach 1:
The patent extracts and eliminates the problematic intermediate steps involving precipitation and unstable bond formation. By using direct hydrosilylation of vinyl groups with Si-H bonds, the method avoids forming Si-O-C bonds entirely, producing only stable Si-C bonds and eliminating the need for filtration steps.
Solution Approach 2:
The patent converts the harmful unstable Si-O-C bonds into beneficial stable Si-C bonds. The hydrosilylation reaction directly forms strong silicon-carbon bonds while avoiding the formation of hydrolyzable silicon-oxygen-carbon bonds, thereby improving product stability and simplifying the production process.
3Use of energy by moving object
If hydrogen containing polysiloxane reacts with unsaturated monomer and undergoes hydrogen silicide addition followed by esterification, then acryloyl oxygen alkyl modified polysiloxane is obtained, but energy consumption is very high and double bonds can self-polymerize
Solution Approach 1:
The patent extracts and eliminates the high-energy esterification step and the problematic self-polymerization risk. By using direct hydrosilylation where Si-H bonds react with vinyl groups under mild conditions, the method avoids both the high energy consumption of esterification and the self-polymerization issues associated with excess acrylic acid.
Solution Approach 2:
The patent converts the potentially harmful self-polymerization reaction into a beneficial controlled hydrosilylation reaction. By using stoichiometric control of Si-H to vinyl ratio and conducting the reaction under inert atmosphere, the method prevents unwanted self-polymerization while maintaining high conversion efficiency.
4Ease of manufacture
If hydroxyl containing polysiloxane reacts with (methyl) acrylic acid to directly dehydrate and produce acryloyl oxygen alkyl modified polysiloxane, then the product is obtained, but self-polymerization of double bonds occurs
Solution Approach 1:
The patent converts the harmful self-polymerization side reaction into a beneficial main reaction pathway. By using hydrosilylation where Si-H bonds selectively react with vinyl groups, the method makes the desired substitution reaction faster and more selective than self-polymerization, thereby preventing the harmful side reaction while maintaining process simplicity.
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 solution provides a surface control additive that maintains coating smoothness and prevents precipitation, adapting to various radiation curing systems by participating in film formation reactions under UV/EB light, ensuring long-term non-adhesive and smooth coatings with reduced shrinkage.
Implementation Method 1
A method involving hydrosilylation to produce acryloyl group containing acryloyl oxygen alkyl modified polysiloxane
Implementation Method 2
participating in film formation reactions under UV/EB light
Data Source
AI summary
The present invention is related to a surface control additive for a radiation curing system, the method for its preparation as well as its application. The surface control additive has the following structure:wherein A iswherein m is an integer from 0 to 400, n is an integer from 1 to 500, x is an integer from 0 to 800, p is an integer from 0 to 600, q is an integer from 1 to 800, R4 and R5 are H or CH3 respectively, R6 is H or a linear or a branched alkyl group containing 1-18 carbon atoms or an acyl group containing 2-5 carbon atoms. The surface control additive of the present invention is applied to radiation curing (UV/EB) paint and inks, enables the coatings to maintain non-adhesive and smooth for a long time, and minimizes transferable precipitates from a cured film. In addition, by using different combinations of EO and PO, the surface control additive of the present invention can adapt to a free selection from high-polarity aquosity to a low-polarity aliphatic hydrocarbon solvent system.