Comb Copolymer Stabilizes Calcium Carbonate Suspension Viscosity
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Solution Overview
Problem
Calcium carbonate suspensions in industrial applications face temperature sensitivity issues, leading to increased viscosity and potential equipment damage, which existing additives fail to adequately address, especially at temperatures above 65°C.
Innovation Solution
A comb copolymer with specific characteristics, including a difference in specific viscosity of ≤0.5 between 20°C and 70°C, no cloud point between 20°C and 95°C, and a specific charge of -10 C/g to -600 C/g at pH 8, is used to stabilize calcium carbonate suspensions, maintaining viscosity between 25 and 1000 mPa.s across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional additives are used to control viscosity at high temperatures, then viscosity control is improved, but the additives deteriorate at temperatures above 65°C causing flocculation and equipment damage
Solution Approach 1:
The patent changes the chemical parameters of the additive by using a comb copolymer with specific characteristics: a difference in specific viscosity Δηsp ≤ 0.5 between 20°C and 70°C, no cloud point between 20°C and 95°C, and a specific charge of -10 C/g to -600 C/g at pH 8. These parameter changes enable the additive to maintain effectiveness across a wide temperature range without deteriorating
Solution Approach 2:
The invention uses a composite polymer structure (comb copolymer) that combines multiple functional characteristics in a single molecule: temperature-independent viscosity behavior, high thermal stability (no cloud point up to 95°C), and specific charge properties. This composite structure resolves the contradiction by integrating multiple protective functions into one additive
2Reliability
If cooling equipment continuously is used to prevent flocculation, then equipment damage is prevented, but production cost increases
Solution Approach 1:
The comb copolymer additive provides self-protection against temperature-induced flocculation through its inherent molecular structure. The polymer's specific viscosity characteristics and charge properties automatically prevent particle aggregation without requiring external cooling systems, making the suspension self-regulating across temperature variations
3Manufacturing precision
If energy-intensive grinding and dispersing processes are used to reduce particle size, then particle size control is improved, but suspension temperature increases dramatically
Solution Approach 1:
The comb copolymer acts as an intermediary substance that mediates between the mechanical energy input from grinding/dispersing and the thermal consequences. The polymer absorbs and distributes the thermal stress through its molecular structure, preventing localized overheating and maintaining suspension stability during energy-intensive processing
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 comb copolymer effectively reduces the temperature sensitivity of calcium carbonate suspensions, preventing viscosity increases and equipment damage, while being compatible with various industrial applications such as paper, paint, and concrete.
Implementation Method 1
the viscosity of said aqueous suspension measured at 20 s-1
Data Source
AI summary
The invention relates to the use of a comb polymer for preparing a suspension, said suspension including calcium carbonate, the viscosity of said aqueous suspension as measured by a HAAKE Rheostress rheometer at 20 s-1 being between 25 and 1,000 mPa·s measured at 20 °C and 90 °C.