Nonionic Polyacrylamide

Application Scope

Water Treatment:
Treatment of inorganic mineral suspensions (such as metallurgical and coal mine wastewater), especially suitable for positively charged colloids.

Oilfield Applications:
Used as a mobility control agent and drilling mud additive, effectively reducing water loss during oil recovery.

Papermaking Industry:
Acts as a retention and drainage aid, and enhances paper strength.

Textile Printing and Dyeing:
Used for slurry thickening and textile sizing processes.

Soil Improvement:
Functions as a water-retaining and drought-resistant agent, improving soil structure.

Mining and Metallurgy:
Applied in slurry sedimentation and tailings recovery.

Product Properties

• Appearance: White granules

• Solid Content: ≥ 88%

• Molecular Weight: 4–12 million

• Water Insolubles: ≤ 2%

• Degree of Hydrolysis: ≤ 5%

• Dissolution Time: ≤ 90 minutes

Features and Performance

1. Nonionic Characteristics
   The molecular chains carry no electrical charge, offering strong salt resistance. Suitable for environments with high electrolyte concentration (e.g. high-salinity wastewater).
   Insensitive to pH variations and maintains good stability under acidic or alkaline conditions (typical pH range: 3–10).

2. Strong Flocculation and Adsorption Ability
   The amide groups on the molecular chains form hydrogen bonds with suspended particles, effectively adsorbing fine particles to form large flocs and accelerating sedimentation or filtration.

3. Thickening and Binding Effect
   Significantly increases the viscosity of aqueous systems and can be used as a thickener or binder, such as in ceramic slurries and textile sizing.

4. Low Toxicity and Environmental Compatibility
   The polymer itself is non-toxic. Attention should be paid to residual acrylamide monomer content, which must comply with industrial safety standards.

5. Limited Shear Resistance
   Due to its long molecular chains, excessive shear force or high-speed agitation may cause chain breakage, resulting in reduced flocculation efficiency.

Product Description

Nonionic Polyacrylamide is a water-soluble polymer and a member of the polyacrylamide (PAM) product family. Its molecular chains contain no ionic functional groups and mainly rely on amide groups (–CONH₂) to exert their function. Through physical adsorption mechanisms, it provides effective flocculation performance and is suitable for positively charged or electrically neutral suspension systems. It is an important multifunctional auxiliary widely used in industrial and water treatment applications. Product selection should be based on water quality, process conditions (pH, salinity), and specific performance requirements such as flocculation or thickening.

Preparation Method

The dissolution of Nonionic PAM is essentially the process of allowing molecular chains to fully unfold from a coiled state to achieve optimal performance. By strictly following the principles of slow addition, moderate agitation, and sufficient aging, a uniform and stable solution can be obtained.

Operating Procedure

Step 1: Water Preparation

Add approximately half of the total required water into the dissolution tank and start agitation at 200–300 rpm.

Step 2: Addition of Dry Powder

Slowly and evenly sprinkle the dry powder into the vortex area of the water flow. Avoid dumping the powder all at once or adding entire bags directly. Use a sieve or powder feeder if necessary to ensure full contact between powder and water.

Step 3: Water Supplement and Aging

After all the powder has been added, continue stirring for 10–20 minutes to allow preliminary dispersion. Add the remaining water to the specified concentration and continue stirring for 40–60 minutes until the solution becomes clear and free of undissolved particles.
Aging: Stop stirring and allow the solution to stand for 1–2 hours to fully extend the molecular chains and achieve optimal viscosity.

Usage Instructions

The dosing and application of Nonionic Polyacrylamide (NPAM) are critical to its performance. Proper use involves not only dosage but also concentration, dosing point, method, and mixing intensity.

I. Jar Test Requirement

Actual dosage must be determined by jar testing; theoretical calculations are for reference only.

1. Take representative water samples into multiple beakers.

2. Prepare NPAM working solutions at different concentrations.

3. Apply a fixed mixing procedure:

   • Rapid mixing (150–200 rpm) for 1–2 minutes to ensure thorough dispersion;

   • Slow mixing (50–60 rpm) for 5–10 minutes to promote floc growth.

4. Allow settling for 5–10 minutes and observe floc size, settling rate, and supernatant clarity.

Select the dosage that provides the best performance at the lowest cost. Typical dosage ranges from 0.5 ppm to 20 ppm (0.5–20 g per ton of water).

II. On-Site Dosing Guidelines

Dosing Methods:

1. Gravity drip dosing: Suitable for small systems, flow controlled by valves.

2. Metering pump dosing: Highly recommended. Screw pumps or diaphragm metering pumps provide precise and stable continuous dosing.

3. Avoid direct impact: The dosing pipe should be submerged below the liquid surface or directed into turbulent flow for rapid dispersion.

III. Mixing Intensity Control (Critical for Flocculation)

• Stage 1: Rapid Mixing (Dosing Point)
  Strong turbulence required (G value approx. 300–600 s⁻¹) for 10–30 seconds to disperse the chemical uniformly.

• Stage 2: Slow Flocculation (Reaction Tank)
  Gentle mixing required (G value approx. 20–80 s⁻¹) for 5–20 minutes to allow flocs to grow and densify without breakage.

Precautions

1. Prohibition: Do not directly add NPAM dry powder or high-concentration stock solution into the treatment tank.

2. Compatibility Testing: When used together with inorganic coagulants (PAC/PFS), compatibility tests are required to determine dosing sequence and time interval. Typically, inorganic coagulants are added first, followed by NPAM after 30–60 seconds of mixing.

3. Pipeline Adhesion: NPAM solutions are viscous. Flush dosing pipelines with clean water after shutdown to prevent blockage.

4. Performance Adjustment:

   • Small flocs or slow settling may indicate insufficient dosage or inadequate mixing.

   • Loose or fragile flocs may indicate overdosing or excessive shear.

   • Turbid supernatant may require pH adjustment or investigation of interfering substances.

Packaging and Storage

Packed in 25 kg plastic-lined woven bags or paper-plastic composite bags, with customized packaging available upon request.
During storage and transportation, protect from heat and moisture and avoid package damage. Long-term exposure to air may cause moisture absorption and caking. Stacking height should not exceed 20 layers.
The product has a shelf life of 2 years under proper storage conditions. Standard particle size is 20–80 mesh, and customized specifications are available upon request.https://tianshengchem.com/backend

Q: What is its function in the textile industry?
A:
In textile processing, this product is used as a slurry thickener and sizing agent, improving slurry stability, processing efficiency, and fabric quality.