Fluorosilicone Mold Release Composition for Reduced Environmental Persistence
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Solution Overview
Problem
Conventional fluorocompounds with long perfluoroalkyl chains are environmentally persistent and difficult to decompose, while existing fluorosilicone mold release agents lack sufficient mold releasability and durability.
Innovation Solution
A fluorosilicone mold release composition with a short chain fluoroalkyl group, specifically a compound of formula (I), which includes a pentafluoroethyl group and a silyl group with a hydrolyzable site, is developed to enhance mold releasability and durability, using a hydrosilylation reaction and a cure accelerating catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorocompounds with long perfluoroalkyl chains are used as mold release agents, then mold releasability is improved, but environmental persistence increases and decomposition becomes difficult
Solution Approach 1:
The patent changes the carbon chain length parameter of the fluoroalkyl group from 8 or more carbon atoms (conventional) to 1-4 carbon atoms (short chain), specifically using CF3CF2CH2- group. This parameter change reduces environmental persistence while maintaining mold releasability through the fluorosilicone compound structure.
Solution Approach 2:
The patent creates a composite molecular structure combining silicone moiety (polymer backbone with Si-O-Si bonds) and fluorine moiety (short chain fluoroalkyl group). This fluorosilicone compound integrates the benefits of both silicone (mold releasability) and fluorine (low environmental persistence) into a single material system.
2Reliability
If existing fluorosilicone oils are used as mold release agents, then some mold releasability is achieved, but the performances are not sufficient
Solution Approach 1:
The patent optimizes multiple parameters of the fluorosilicone compound: the fluoroalkyl chain length (1-4 carbons), the polymer structure (formula (I) with specific m, n, o ratios), and the hydrolyzable silyl group configuration. These parameter changes enhance both initial mold releasability and durability for repeated use.
Solution Approach 2:
The patent introduces a hydrolyzable silyl group as an intermediary functional moiety that enables the fluorosilicone compound to form a cured silicone film on the mold surface. This film acts as an intermediary layer providing durable mold releasability across multiple production cycles.
3Object-affected harmful factors
If fluorosilicone compound with short fluoroalkyl chain is used, then environmental persistence is reduced, but mold releasability may be compromised
Solution Approach 1:
The patent designs a composite fluorosilicone molecule where the short fluoroalkyl chain (CF3CF2CH2-, 1-4 carbons) provides low environmental persistence while the silicone polymer backbone (formula I) and hydrolyzable silyl group provide durable mold releasability. The synergistic combination maintains performance while reducing harm.
Solution Approach 2:
The patent applies different functional qualities to different parts of the molecule: the short fluoroalkyl chain (local region) provides environmental friendliness, while the silicone polymer backbone and hydrolyzable silyl group (other local regions) provide mold releasability and durability. Each part performs its specialized function.
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 fluorosilicone composition exhibits excellent mold releasability and durability, allowing for repeated use and reduced environmental impact due to its short fluoroalkyl chain, as demonstrated by improved peel strength and continuous demolding capabilities.
Implementation Method 1
The fluorosilicone compound of formula (I), wherein a hydrosilylation reaction has taken place
Implementation Method 2
Z is a silyl group containing a hydrolyzable site
Data Source
AI summary
Disclosed in a mold release composition comprising a fluorosilicone compound of the formula (I): (I) wherein R1, R2, R4, R5, R6, R7, R8 and R9 each is, the same or different, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group, R3 and R10 each is; the same or different, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group, or Rf-X-, or Z-Y- in which X and Y each is; the same or different, a divalent organic group, Rf is a C1-6 fluoroalkyl group, Z is a silyl group containing a hydrolyzable site, m is 1-100, n is 1-50, and o is 0-200. The mold release composition can give excellent mold releasability and durability of mold releasability (repeated mold releasability).