Homogeneous Mold Release Solution for Engineered Stone
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Solution Overview
Problem
Existing mold release solutions often undergo phase separation during storage or shipping, especially in cold conditions, leading to the need for on-site mixing and cooking, which can result in foam formation and pinholes in the mold release film.
Innovation Solution
A homogeneous, aqueous mold release solution is developed, comprising 5-90 wt% water, 3-40 wt% polyvinyl alcohol, 0.01-3.2 wt% surfactant, 1-20 wt% sugar alcohol, 0.005-1.05 wt% defoamer, and up to 50 ppm biocide, with a viscosity range of 20-600 cps at 23°C, which is stable during storage and shipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aqueous solutions containing nonpolar ingredients are used as mold release agents, then mold release function is provided, but phase separation occurs during storage or shipping especially in cold conditions
Solution Approach 1:
The patent uses a composite surfactant system combining nonionic surfactants (such as polysorbates, polyethylene glycol alkyl ethers) with ionic surfactants (such as alkyl sulfates, alkylbenzene sulfonates) to create a stable aqueous solution that prevents phase separation while maintaining mold release functionality. This composite approach allows the solution to remain homogeneous during storage and shipping in cold conditions.
Solution Approach 2:
The patent optimizes the concentration ranges of different surfactant components and adjusts solution parameters such as pH and ionic strength to prevent phase separation. By carefully controlling the composition parameters within specific ranges, the solution maintains stability across a wide temperature range while preserving its mold release properties.
2Stability of the object's composition
If on-site mixing and cooking of mold release components is performed, then homogeneous solution is achieved, but foam formation occurs resulting in pinholes in the mold release film
Solution Approach 1:
The patent extracts and eliminates the problematic mixing and cooking steps from the application process by providing a pre-formulated homogeneous solution that is ready to use. The solution is manufactured under controlled conditions to achieve complete mixing without introducing air bubbles, then shipped ready for application, thereby removing the source of foam formation.
Solution Approach 2:
The patent employs defoaming agents (such as silicone-based defoamers or organic compounds) as intermediaries that prevent foam formation during application. These defoamers break down any bubbles that form during spraying and ensure the mold release film forms without pinholes, maintaining film integrity.
3Reliability
If mold release film has low porosity to prevent monomer migration, then protective barrier function is improved, but spray coating process may generate foam creating pinholes that decrease protective nature
Solution Approach 1:
The patent incorporates defoaming agents into the mold release solution formulation in advance, before application. This preliminary inclusion of defoamers ensures that any bubbles formed during spray coating are immediately suppressed and eliminated, preventing pinhole formation in the film while maintaining the required low porosity for protective barrier function.
Solution Approach 2:
The patent carefully controls the concentration of defoaming agents and other solution parameters to achieve the optimal balance between film integrity and protective barrier properties. By adjusting parameters such as surfactant concentration, pH, and defoamer content within specific ranges, the solution forms a pinhole-free film with adequate barrier properties to prevent monomer migration.
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 stable, low-foaming, and homogeneous mold release film with excellent barrier properties, preventing monomer migration and maintaining mold integrity, while eliminating the need for on-site mixing and cooking.
Implementation Method 1
0.01 to 3.2 wt % of a surfactant
Implementation Method 2
0.005 to 1.05 wt % of a defoamer
Implementation Method 3
3 to 40 wt % of a polyvinyl alcohol
Data Source
AI summary
A homogeneous, aqueous mold release solution including: 5 to 90 wt % water; 3 to 40 wt % polyvinyl alcohol; 0.01 to 3.2 wt % surfactant; 1 to 20 wt % sugar alcohol; 0.005 to 1.05 wt % defoamer; and up to 50 ppm biocide, where a total of all components adds to 100 wt %. The mold release solutions have a viscosity in a range from 20 to 600 cps when measured at 23° C. In another aspect, embodiments disclosed herein relate to a homogeneous, aqueous mold release solution including: 5 to 85 wt % water; 10.5 to 15 wt % polyvinyl alcohol; 0.56 to 0.8 wt % surfactant; 1 to 8 wt % sugar alcohol; 0.01 to 0.3 wt % defoamer; and up to 50 ppm biocide, wherein a total of all components adds to 100 wt %. Also disclosed are films prepared from the mold release solutions, as well as methods of coating a substrate using such mold release solutions.