PVC-Safe Cement Grinding Additive Defoamer
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Solution Overview
Problem
Phosphate-based defoamers used in cement grinding processes can degrade polyvinylchloride (PVC) equipment, leading to instability and safety issues in cement manufacturing.
Innovation Solution
A PVC-safe cement grinding additive composition is developed, using ethoxylated, propoxylated fatty alcohol or polyalkoxylated polyalkylene polyamine as defoamers, combined with triisopropanolamine and biopolymer polysaccharide gums, which are stable and uniformly dispersed, allowing for the use of PVC equipment during cement production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphate-based defoamers (e.g., TIBP) are used in cement grinding additive, then air detaining effectiveness is improved, but PVC equipment is degraded by dissolving plasticizers
Solution Approach 1:
The harmful phosphate-based defoamer (TIBP) is extracted and removed from the cement grinding additive composition. The patent specifically excludes phosphate esters from the additive formulation to prevent dissolution of PVC plasticizers, while retaining effective air detaining through alternative non-phosphate defoaming agents or process modifications
Solution Approach 2:
The patent introduces an intermediary substance or mechanism that provides air detaining functionality without the harmful phosphate components. This could be a alternative defoamer composition or a protective coating on PVC equipment that mediates between the grinding additive and PVC plasticizers, preventing direct contact and degradation
2Reliability
If TIBP is used as defoamer, then foam control is improved, but rubber materials (e.g., BUNA-N, VITON) are degraded by dissolving plasticizers
Solution Approach 1:
The harmful phosphate-based defoamer TIBP is extracted from the formulation to prevent dissolution of rubber plasticizers in BUNA-N and VITON materials used in sealing and gasket applications at cement plants, while maintaining foam control through alternative means
3Productivity
If conventional cement grinding additive is used, then grinding efficiency is improved, but compatibility with PVC equipment cannot be ensured
Solution Approach 1:
The chemical composition parameters of the cement grinding additive are changed by eliminating phosphate-based defoamers and adjusting the formulation to use PVC-compatible ingredients. This parameter modification maintains grinding efficiency while adapting the additive for use with PVC equipment in modern cement plants
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 ensures the stability and uniform distribution of defoamers throughout the cement additive, resisting degradation from harsh grinding temperatures and mechanical processes, while being safe for PVC equipment, resulting in improved cement quality and equipment longevity.
Implementation Method 1
whereby said air detraining agent is uniformly disbursed throughout the cement grinding additive composition
Data Source
AI summary
The present invention provides cement grinding additive compositions and methods which allow a PVC-safe, powerful, and robust defoaming agent to be uniformly dispersed throughout a broad concentration range while retaining storage stability even in cases wherein the defoaming agent is highly diluted. Exemplary cement grinding additive compositions comprise at least one amine cement grinding additive; an air detrainer selected from the group consisting of (i) ethoxylated, propoxylated fatty alcohol or alkylphenol, (ii) polyalkoxylated polyalkylene polyamine, or (iii) a mixture thereof.