NBR-PVC Latex Blend for Chemical Resistance
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Solution Overview
Problem
Existing elastomeric gloves, such as NBR gloves, lack chemical resistance and are cost-ineffective, failing to pass migration tests required for food industry applications.
Innovation Solution
A latex formulation combining carboxylated acrylonitrile butadiene rubber (XNBR) or acrylonitrile butadiene rubber (NBR) with polyvinyl chloride (PVC) and processing additives like accelerators, antifoaming agents, and antioxidants, blended and processed to create a glove with enhanced chemical resistance and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If NBR gloves are used to provide good dexterity and puncture resistance, then mechanical properties are improved, but chemical resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining NBR and PVC in a specific ratio (70:30 to 90:10) to create a glove material that exhibits both the mechanical properties of NBR and the chemical resistance of PVC, particularly against acetic acid
Solution Approach 2:
The patent changes the compositional parameters by adjusting the ratio of NBR to PVC and controlling the plasticizer content (0-50 phr) to achieve optimal balance between mechanical properties and chemical resistance
2Reliability
If XNBR gloves are used to improve chemical resistance, then reliability is improved, but cost increases
Solution Approach 1:
The patent uses a composite of NBR and PVC as a cost-effective alternative to pure XNBR, achieving similar chemical resistance properties through material composition rather than using more expensive materials
Solution Approach 2:
The patent employs cheaper materials (NBR and PVC) that can be used in disposable gloves, replacing more expensive but durable materials like XNBR, while maintaining adequate performance for single-use applications
3Ease of operation
If conventional latex formulations are used to ensure elasticity, then mechanical flexibility is improved, but migration test compliance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by selecting specific elastomers (NBR or XNBR) and controlling elastomer content (50-99 phr) to reduce migration of harmful substances while maintaining flexibility through proper material selection and composition
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 resulting glove exhibits improved chemical resistance, mechanical properties, and compliance with migration tests, while being cost-effective and free from latex proteins and phthalate-based plasticizers, suitable for food industry use.
Implementation Method 1
blending elastomer with thermoplastic to produce a dispersion containing both thermoplastic and elastomer and stirring the dispersion containing both thermoplastic and elastomer for a duration between 2 minutes to 30 minutes until a homogeneous blend is achieved
Implementation Method 2
crosslinker
Data Source
AI summary
A latex formulation comprising elastomer, thermoplastic, accelerator, antifoaming agent, antioxidant, crosslinker, colouring agent, surfactant, filler, pH adjuster and dispersing medium, wherein the latex formulation has a total solid content ranging between 5% by weight to 40% by weight. A method of preparing a latex formulation to manufacture a glove containing both thermoplastic and elastomer, wherein the method comprises the steps of blending elastomer with thermoplastic to produce a dispersion and stirring the dispersion, adding while stirring accelerator, antifoaming agent, antioxidant, crosslinker, colouring agent, surfactant and filler one after another with no particular order and followed by pH adjuster into the dispersion to produce latex formulation and stirring continuously and allowing to mature, wherein total solid content is adjusted to between 5% by weight to 40% by weight by way of addition of dispersing medium and wherein pH range of the latex formulation is adjusted to between 9 to 11.