Aqueous Modified Polyolefin Dispersion Surfactant Addition
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Solution Overview
Problem
Aqueous modified polyolefin resin dispersions without surfactants face challenges in storage stability, mechanical stability, and wettability to polyolefin substrates, leading to reduced adhesion and water resistance of the coating film.
Innovation Solution
A method for producing an aqueous modified polyolefin dispersion composition involving the steps of obtaining a dispersion using a modified polyolefin, an organic solvent, and water, followed by removing the solvent and then adding a surfactant in the range of 0.1 to 10 wt.% based on the polyolefin weight, specifically using acid-modified polyolefins and chlorinated polyolefins with controlled molecular weight and chlorine content, and mixing nonionic surfactants with an HLB of 9 or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surfactant is added to make modified polyolefin water soluble, then water solubility and adhesion are improved, but foaming occurs during solvent removal and processing time increases
Solution Approach 1:
The patent applies preliminary action by completely removing the organic solvent before adding the surfactant. This sequence prevents the surfactant from being present during solvent removal, thereby eliminating foaming issues while still achieving the desired adhesion benefits when the surfactant is added subsequently to the water-based dispersion.
Solution Approach 2:
The patent segments the process into distinct stages: first removing all organic solvent to create a water-based dispersion, then separately adding the surfactant in controlled amounts (0.1-10 wt%). This segmentation allows each step to be optimized independently, preventing foaming while achieving adhesion.
2Reliability
If a large amount of auxiliary agent is added to make modified polyolefin water soluble, then water solubility is improved, but water resistance of the dry film is reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surfactant concentration within a narrow range of 0.1-10 wt% based on modified polyolefin weight. This optimized parameter range provides sufficient water solubility and dispersion stability while minimizing the negative impact on water resistance of the dry film.
Solution Approach 2:
The patent uses a minimal amount of surfactant as an intermediary to facilitate water dispersion of the modified polyolefin. By limiting the surfactant to 0.1-10 wt%, it serves as just enough mediator to achieve water solubility without excessive amounts that would compromise water resistance.
3Productivity
If no surfactant is used in the dispersion, then processing time is reduced and foaming is prevented, but storage stability and wettability deteriorate
Solution Approach 1:
The patent applies preliminary action by removing all organic solvent before adding any surfactant. This creates a stable water-based dispersion foundation first, then allows minimal surfactant (0.1-10 wt%) to be added subsequently for optimal storage stability and wettability, while having already eliminated the foaming issue.
Solution Approach 2:
The patent optimizes the surfactant concentration parameter to 0.1-10 wt% based on modified polyolefin weight. This precise parameter control provides just enough surfactant to ensure storage stability and wettability while minimizing processing time and preventing foaming.
4Reliability
If modified polyolefin is made water soluble by melting, then water solubility is achieved, but molecular weight range is limited due to high melt viscosity
Solution Approach 1:
The patent uses an organic solvent as an intermediary medium to dissolve the modified polyolefin at lower temperatures, avoiding the high-temperature melting process. This allows polyolefins with higher molecular weights that would have excessive melt viscosity to be successfully dissolved and dispersed in water, expanding the usable molecular weight range.
Solution Approach 2:
The patent replaces the mechanical melting process with a chemical dissolution process using organic solvent. Instead of relying on thermal energy to melt and dissolve the polyolefin (which is limited by melt viscosity), the organic solvent chemically dissolves the polymer, enabling broader molecular weight compatibility.
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
This method prevents foaming during solvent removal, reduces processing time, and results in dispersions with excellent adhesion and water resistance, allowing for suitable surfactant selection based on application, enhancing long-term storage stability and wettability.
Implementation Method 1
mixing a surfactant with the aqueous modified polyolefin dispersion in an amount of 0.1 to 10 wt.% based on the weight of the modified polyolefin
Implementation Method 2
obtaining an aqueous modified polyolefin dispersion using a modified polyolefin, an organic solvent, a base compound, and water as starting materials
Implementation Method 3
when the dispersion is applied to the surface of a polyolefin substrate and dried to form a dry coating film, a uniform dry coating film is obtained through a process in which the dispersion particles are fused together while water evaporates
Data Source
AI summary
Provided is a method for producing an aqueous modified polyolefin dispersion composition that is industrially excellent, the method comprising the steps of preparing an aqueous modified polyolefin dispersion that does not contain a surfactant, and then mixing a specific surfactant, whereby foaming can be suppressed during the removal of the organic solvent, and the processing time can be significantly reduced. The method for producing an aqueous modified polyolefin dispersion composition comprises the steps (1) and (2): (1) step 1 of obtaining an aqueous modified polyolefin dispersion using a modified polyolefin, an organic solvent, a base compound, and water as starting materials; and (2) step 2 of mixing a surfactant with the aqueous modified polyolefin dispersion in an amount of 0.1 to 10 wt.% based on the weight of the modified polyolefin.