Purchasing Guide for Textile Printing and Dyeing Grade Sodium Carboxymethyl Cellulose (CMC)

I. INTRODUCTION

Textile Printing and Dyeing Grade Sodium Carboxymethyl Cellulose (CMC) is widely used in the textile printing and dyeing industry, and its performance directly affects the printing and dyeing effect and product quality. In order to help buyers obtain high-quality products, this purchasing guide is specially written.

II. Product Characteristic Cognition

1. ** Chemical Structure **: Textile printing and dyeing grade CMC is chemically modified from cellulose, introducing carboxymethyl groups, and its unique structure endows it with good water solubility and thickening.

2. ** Performance Characteristics **

- ** Thickening **: It can effectively increase the viscosity of the printing and dyeing solution, make the dyes evenly dispersed, ensure the uniform color of the printing and dyeing, and prevent the precipitation and swimming of the dyes.

- ** Water Solubility **: It is easily soluble in water to form a stable colloidal solution, which is conducive to mixing with other printing and dyeing auxiliaries and improves the convenience of printing and dyeing operations.

- ** Suspension Stability **: It can make the dye particles evenly suspended in the printing and dyeing solution, avoid aggregation and settlement, and ensure the stable quality of printing and dyeing.

III. Quality Discrimination Points

1. ** Purity **: High purity CMC has few impurities and has little negative impact You can check the product purity index. The lower the impurity content, the better.

2. ** Degree of Substitution (DS) **: Refers to the average number of carboxymethyl substituted hydroxyl groups on each glucose unit. The suitable DS for printing and dyeing grade CMC is usually between 0.6 - 0.9, and the requirements of different printing and dyeing processes are different. DS affects the solubility, thickening and stability of CMC. Appropriate products should be selected according to specific needs.

3. ** Viscosity **: is a key indicator. Different printing and dyeing processes have different requirements for viscosity. High viscosity CMC is required for printing to ensure a clear pattern. Low viscosity products are used for dyeing to make the dye penetrate evenly. When purchasing, clarify the printing and dyeing process and choose the corresponding viscosity products.

Fourth, supplier screening

1. ** Production Qualification **: Suppliers should have legal production license and relevant quality certification, such as ISO quality management system certification, to ensure stable product quality and production specifications.

2. ** Production Experience **: Preference is given to enterprises with many years of experience in textile printing and dyeing grade CMC production. Rich experience means mature technology, stable process, and more guaranteed product quality.

3. ** Customer Evaluation **: Through industry forums, social media or consulting with peers, understand the supplier's word-of-mouth and customer satisfaction, including product quality, delivery time, after-sales services, etc.

5. Price Consideration

1. ** Cost Composition **: The price is affected by factors such as raw materials, production process, packaging, transportation, etc. High-quality raw materials and advanced processes have high costs, and product quality is guaranteed. When purchasing, comprehensively consider product quality and price, and do not ignore quality just because of low prices.

2. ** Cost-effective evaluation **: Compare product quality and price of different suppliers, and choose cost-effective products. Sample tests can be requested to evaluate the printing and dyeing effect and quality stability, and determine the best procurement plan in combination with the price.

6. Procurement process

1. ** Demand communication **: Communicate purchasing needs with suppliers in detail, including product specifications, quantity, delivery time, etc., to ensure that both parties understand the same.

2. ** Sample Inspection **: Request samples before purchase, test according to the requirements of printing and dyeing process, evaluate the quality and applicability, and then purchase in batches if the samples are qualified.

3. ** Contract Signing **: Clarify the terms of product Quality Standard, price, delivery method, payment method, after-sales services, etc., and protect the rights and interests of both parties with a written contract.

4. ** Delivery Acceptance **: Receive the goods at the time and place agreed in the contract, accept according to Quality Standard, and negotiate with the supplier in time if there is any discrepancy.

VII. CONCLUSION

Purchasing textile printing and dyeing grade sodium carboxymethyl cellulose (CMC) requires comprehensive product characteristics, quality, suppliers, price and procurement process. Through rigorous screening and evaluation, high-quality products and reliable suppliers are selected to provide strong support for textile printing and dyeing production, enhancing product quality and enterprise competitiveness.