Anti-contamination agent composition
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Solution Overview
Problem
Existing anti-contamination agent compositions in paper-making processes are insufficient in preventing pitch contamination in dry parts, as they fail to effectively disperse and prevent pitch adhesion on equipment surfaces.
Innovation Solution
An anti-contamination agent composition containing a linear polysiloxane compound and a cyclic siloxane compound, along with an emulsifier and water, is applied to dry parts, forming a film that prevents pitch adhesion and efficiently disperses pitch, with specific blending ratios and properties enhancing the pitch dispersing and adhesion prevention effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing anti-contamination agent compositions containing silicone-based compounds are applied to dry parts, then pitch adhesion is prevented to some extent, but pitch dispersibility is insufficient and undispersed pitch may reach the dry part
Solution Approach 1:
The patent combines a linear polysiloxane compound (provides adhesion prevention) with a cyclic siloxane compound (provides dispersibility) to create a composite anti-contamination agent. This composite formulation simultaneously achieves both pitch adhesion prevention and effective pitch dispersal, resolving the contradiction between these two functions that could not be satisfied by single-component compositions.
Solution Approach 2:
The patent specifies precise parameter ranges for the polysiloxane compound (formula (1) with specific substituents R1 and repeating units n from 20 to 1430) and combines it with cyclic siloxane compounds in specific ratios. By optimizing these chemical parameters and composition ratios, the anti-contamination agent achieves both sufficient adhesion prevention and effective pitch dispersibility.
2Object-affected harmful factors
If polysiloxane compounds with specific chemical structures are used to prevent pitch adhesion, then anti-contamination effect is achieved, but pitch dispersal effectiveness is insufficient
Solution Approach 1:
The patent creates a composite system where the linear polysiloxane compound (with substituents including amino-modified, epoxy-modified, carboxy, phenol, or mercapto groups) provides adhesion prevention while the cyclic siloxane compound (octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, or dodecamethylcyclohexasiloxane) provides dispersal capability. This composite approach simultaneously addresses both harmful effects.
Solution Approach 2:
The cyclic siloxane compound acts as an intermediary substance that facilitates pitch dispersal while the polysiloxane compound prevents adhesion. Together they form a coordinated system where each component performs its specialized function, effectively managing both adhesion prevention and pitch dispersal.
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 effectively prevents pitch contamination by forming a stable film on equipment surfaces, ensuring efficient pitch dispersal and preventing both initial and re-adhesion, thereby improving paper yield and quality.
Implementation Method 1
a cyclic siloxane compound, which effectively disperses pitch
Implementation Method 2
an anti-contamination agent composition for preventing pitch contamination in a dry part of a paper-making process, the composition containing a linear polysiloxane compound... forming a film that prevents pitch adhesion
Data Source
AI summary
[Problem] To provide a contamination preventing agent composition capable of effectively preventing pitch contamination in a dry part. [Solution] The present invention relates to a contamination preventing agent composition for preventing pitch contamination in a dry part D of a papermaking process, the composition containing: a linear polysiloxane compound represented by formula (1); and a cyclic siloxane compound. [In formula (1), a substituent R1 represents, in the same molecule, a hydrogen atom, an alkyl group, a methylphenyl group, a polyether group, a higher fatty acid ester group, an amino-modified group, an epoxy-modified group, a carboxylic group, a phenol group, a mercapto group, a carbinol group, or a methacrylic group, and a repeating number n of a siloxane unit represents an integer of 20-1430.]