UA-HPD Grout for Fast Curing and Stain Resistance
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Solution Overview
Problem
Current grout compositions face challenges with slow strength development, susceptibility to staining, and long cure times, which affect their performance in terms of hardness, durability, flexibility, and water resistance, particularly in humid environments and with water-absorbing materials.
Innovation Solution
The development of urethane-acrylic hybrid polymer dispersion (UA-HPD) grouts, which combine a UA-HPD binder with various filler materials and additional constituents like quartz, glass, and fibers, to create a one-part grout that hardens quickly and provides enhanced strength and stain resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cement-based grouts are used, then cost is reduced and ease of application is improved, but strength development speed is slow and mixing complexity increases
Solution Approach 1:
The patent uses a composite binder system combining polymer-modified cement with acrylic copolymer emulsion and polyurethane dispersion. This composite material approach allows the grout to achieve both the ease of application of cement-based grouts and accelerated strength development through the synergistic effects of the polymer-cement matrix, which provides faster initial set and strength gain compared to conventional cement grouts.
2Strength
If two-part polymer grouts are used, then strength and chemical resistance are improved, but ease of operation deteriorates due to immediate curing requiring quick mixing and application
Solution Approach 1:
The patent segments the binder system into distinct functional components: polymer-modified cement providing structural strength, acrylic copolymer emulsion contributing to adhesion and flexibility, and polyurethane dispersion enhancing durability and water resistance. This segmentation allows each component to be optimized independently while maintaining a single-part formulation that does not require immediate mixing and application like two-part systems.
Solution Approach 2:
The patent modifies the curing parameters by using a water-based single-part system that cures through evaporation and chemical hydration rather than immediate polymerization. This parameter change extends the working time significantly, allowing installers adequate time for mixing and application while still achieving high strength and chemical resistance through the optimized binder composition.
3Ease of operation
If premixed grouts are used, then ease of operation is improved by eliminating mixing, but cure time increases significantly slowing strength development
Solution Approach 1:
The patent employs a composite binder formulation that combines multiple polymers with cementitious materials in a pre-mixed single-part system. This composite structure enables the grout to maintain stability during storage while undergoing accelerated hydration and polymer-cement bonding reactions upon application, achieving both the convenience of pre-mixed formulations and reduced cure times through the synergistic chemical interactions of the composite materials.
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 UA-HPD grouts exhibit improved hardness, durability, and stain resistance, with faster cure times and better performance in humid conditions, making them suitable for a wide range of applications without the need for mixing, while maintaining ease of use and reduced shrinkage and cracking.
Implementation Method 1
a urethane-acrylic hybrid polymer dispersion (UA-HPD) as a binder in combination with one or more filler materials
Implementation Method 2
these types of grouts are often easier to use than cementitious grouts and/or two- or three-part grout systems
Implementation Method 3
The cure or hardening mechanism for these materials is through loss of moisture (e.g., water), which can take several days to cure properly
Data Source
AI summary
Grouts, grout products and methods of applying such grouts that include a urethane-acrylic hybrid polymer dispersion (UA-HPD) and a filler material. The UA-HPD may be present in an amount of about 10-40% by weight of the composition, while the filler material may be present in an amount of about 60-90% by weight of the composition. Additional filler materials may also be provided within the UA-HPD grout composition to provide the resultant UA-HPD grout with desired characteristics and properties. The UA-HPD containing grouts are applied between spaced-apart tiles and/or masonry to fill voids and/or joints there-between.