Silicone Emulsion Composition for Rubber Coating Film
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Solution Overview
Problem
Existing silicone emulsion compositions for forming rubber films face challenges with storage stability, by-product formation, and the need for organotin compounds, which are toxic and environmentally undesirable, while also requiring immediate mixing with platinum catalysts and being inhibited by addition reaction-inhibiting compounds.
Innovation Solution
A silicone emulsion composition combining an organopolysiloxane with at least two hydroxyl groups bonded to silicon atoms with aminoalkyltrialkoxysilane and vinyltrialkoxysilane as crosslinkers, allowing for rapid film formation at room temperature or heat treatment without using organotin compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrosilyl-containing siloxane and platinum catalyst are co-present in the composition, then addition reaction can occur to form rubber film, but reaction takes place or hydrogen gas is released with a lapse of time indicating poor storage stability
Solution Approach 1:
The composition is divided into two separate parts: Part A containing the silicone emulsion and Part B containing the crosslinking agents (alkoxysilane and hydroxysilane). The platinum catalyst is not included in the base composition but added separately during application. This segmentation prevents premature reaction while enabling rapid curing when needed.
Solution Approach 2:
The silicone emulsion is prepared in advance with all necessary components except the catalyst and crosslinking agents. The amine compound is pre-incorporated into the emulsion to provide catalytic activity only when the crosslinking agents are added at the time of application, ensuring stability during storage while enabling rapid film formation when used.
2Productivity
If condensation reaction is used to form rubber film, then organotin compounds must be used as curing catalyst to achieve full cure within short time, but organotin compounds are toxic and environmentally undesirable
Solution Approach 1:
An amine compound serves as an alternative catalyst to organotin compounds. The amine is pre-incorporated into the silicone emulsion and activates the crosslinking reaction only when the alkoxysilane and hydroxysilane are added during application. This intermediary approach eliminates toxic tin compounds while maintaining rapid curing performance.
Solution Approach 2:
The patent changes the catalytic mechanism from organotin-based to amine-based catalysis. By incorporating the amine compound into the emulsion and controlling its interaction with the crosslinking agents, the system achieves rapid film formation without the toxicity associated with traditional organotin catalysts.
3Reliability
If addition reaction is used to form rubber film, then platinum catalyst must be mixed immediately before use, but this indicates inconvenience of use and reduces ease of operation
Solution Approach 1:
The composition is segmented into Part A (silicone emulsion with amine compound) and Part B (crosslinking agents). This segmentation allows the base emulsion to be stored stably without catalyst, while enabling convenient mixing and rapid curing when Parts A and B are combined during application.
Solution Approach 2:
The amine compound in Part A acts as an intermediary that remains dormant until Part B is added. This intermediary approach provides storage stability while enabling convenient, rapid film formation when the two parts are mixed during application, eliminating the need for separate catalyst handling.
4Adaptability or versatility
If substrates contain addition reaction-inhibiting compounds such as amine, tin, phosphorus or sulfur-containing compounds, then addition reaction cannot proceed to full extent, but these compounds are commonly present in industrial substrates
Solution Approach 1:
The amine compound serves as a dual-function intermediary: it is incorporated into the emulsion to provide catalytic activity for crosslinking, and it can neutralize or counteract the inhibiting effects of sulfur, phosphorus, or other additives present in industrial substrates like tires and rubber products, ensuring complete curing despite substrate contaminants.
Solution Approach 2:
The amine compound converts potential harmful effects of substrate contaminants (sulfur, phosphorus, etc.) into beneficial outcomes by acting as a catalyst that can overcome inhibition and promote complete crosslinking reaction even in the presence of these interfering substances.
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 stable and rapid formation of a cured rubber film without organotin compounds, improving storage stability and eliminating by-product issues, while being environmentally friendly and free from the toxicity concerns associated with tin compounds.
Implementation Method 1
a silicone emulsion composition comprising an organopolysiloxane (A) having per molecule at least two hydroxyl groups bonded to silicon atoms at molecular ends, an aminoalkyltrialkoxysilane (B), and a vinyltrialkoxysilane (C)
Data Source
AI summary
The silicone emulsion composition for forming a rubber coating film according to the present invention, including (A) organopolysiloxane having at least two hydroxyl groups bonded to silicon atoms at terminal ends of the molecule in each molecule thereof, (B) aminoalkyltrialkoxysilane represented by formula (1) (where R1 through R3 represent H or a univalent hydrocarbon group, R4 and R5 represent divalent hydrocarbon groups, R6 represents a univalent hydrocarbon group, and n is an integer 0 to 6), (C) vinyltrialkoxysilane represented by formula (2): CH2=CHSi(OR7)3 (where R7 represents a univalent hydrocarbon group), (D) surfactant, and (E) water and not containing an organic tin compound, is free of problems with storage stability or byproducts, and a rubber coating film can be formed thereby in a short time without the use of an organic tin compound.