Nonionic polyacrylamide

Non-ionic polyacrylamide structural formula: [—CH—CH2—CH—CH2—]n CONH2 CONH2 Polyacrylamide is a kind of polymer compound with relatively active chemical properties.

Product Introduction

Non-ionic polyacrylamide structural formula: [—CH—CH2—CH—CH2—]n CONH2 CONH2 Polyacrylamide is a kind of polymer compound with relatively active chemical properties. Due to the activity of the amido group on the side chain of the molecule, the polymer has obtained many valuable properties. Compared with anionic PAM flocculants.

Non-ionic PAM flocculants do not have ionic functional groups. They have the following characteristics: the flocculation

performance is less affected by water pH and salt fluctuations; under neutral or alkaline conditions, Its flocculation effect (settling speed) is not as good as the anionic type, but it is worse than the anionic type under acidic conditions, and the strength of the floc is stronger than that of the anionic polymer flocculant.

Product Usage

1. Sewage treatment: When the suspended sewage becomes acidic, the use of non-ionic polyacrylamide as flocculant is more

appropriate. At this time, PAM acts as a bridge for adsorption, so that the suspended particles produce flocculation and sedimentation, which can achieve the purpose of purifying sewage, and can also be used for the purification of tap water, especially when used in combination with an inorganic flocculant, and has a better effect in water treatment.

2. Coal mine washing: It can be used for centrifugal separation of coal washing tailings. It is used in the precipitation and filtration of pulverized coal and coal slime, which can increase the recovery rate of pulverized coal and increase the rate of passing plates.

3. Textile auxiliaries: Adding some other chemicals can be formulated into a chemical slurry, used for textile sizing, can improve the adhesion, permeability and desizing performance, is to make textiles anti-static, reduce the sizing rate, reduce the skein Spots, cloth breaks and falling objects.

4. Metallurgical ore dressing: For flotation and smelting of zinc, manganese and copper ore, leaching and residue can be added to PAM to increase separation efficiency.

5. Sand prevention and sand fixation: Add non-ionic polyacrylamide in a concentration of 0.3% to add cross-linking agent and spray on the desert to prevent sand and sand.

6. Chemical grouting agent: Use 9.5 parts of non-ionic polyacrylamide plus 0.5 part of N-methylene bis-acrylamide as the chemical grouting agent that can block water, such as dams, foundations and tunnels.

7. Soil humectants: It can act as a moisturizer in the soil to retain water and fix sand, planting trees, and sand and sand to prevent dust.

8. Oil field profile control and water plugging agent: Non-ionic polyacrylamide is combined with lignocellulose and added with certain chemical additives. It can be used as an oil field profile control and water plugging agent.

Packaging and storage

1.The product uses 25kg outer layer PVC plastic woven bag and inner film two-layer packaging. Can also be packaged according to user requirements.

2.When storing and transporting, pay attention to heat and moisture, and dry powder products will absorb moisture and agglomerate when exposed for a long time. The number of stacking layers must not exceed 20 layers. The effective storage period is 2 years.

Index parameter

 

Index name\Product rating	Execution standard(GB/T17514-2017)
	F3060	F5070	F8010
Ion degree  %≤	10	10	10	10
Molecular weight (million)	300-600	500-700	800-1000
Solid content  %≥	90	90	90	90
Dissolution time  min≤	50	40	30	30

Application fields of nonionic polyacrylamide (NPAM)

1. As a flocculant, it is mainly used in industrial solid-liquid separation processes, including sedimentation, clarification, concentration and sludge dehydration processes. The main industries of application are: urban sewage

treatment, papermaking industry, food processing industry, petrochemical industry, metallurgical industry, mineral processing industry, dyeing industry and sugar industry and various industrial wastewater treatment.

2. In the field of papermaking; nonionic polyacrylamide is mainly used to improve the filterability of pulp, increase the strength of dry paper, and improve the retention rate of fiber and filler.

4. In the mining and coal preparation industries, it can be used as a clarifier for mine wastewater and coal washing wastewater.

5. It can be used for the treatment of dyeing wastewater, leather wastewater, and oily wastewater to remove turbidity and decolorize them to meet the emission standards.

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Dissolution and dosing process of nonionic polyacrylamide (NPAM)

Before using, nonionic polyacrylamide needs to be prepared into a 0.2-0.5% standby solution. It can be diluted or hydraulically transported when added. The storage period of 0.5% standby solution is seven days, and the storage period of 0.05% dosing solution is three days. Pay attention to the following matters when preparing the solution:

1. Dissolution temperature: The dissolution of polyacrylamide requires a certain temperature to speed up the dissolution rate. However, if the temperature is too high, the molecular chain of the polymer will break, reducing

the use effect. The more suitable dissolution temperature is 50-60℃.

2. Stirring conditions: The dissolution of polyacrylamide should avoid excessive shear force stirring. Excessive stirring will break the molecular chain, thereby reducing the use effect. Low-speed blades, such as anchor type,

frame type, multi-layer paddle type, etc., should be used for stirring. The stirring speed is about 60 rpm. High-speed centrifugal pumps should also be avoided when transporting. Piston pumps or diaphragm pumps are more

suitable.

3. Evenly disperse the feeding: The key link of polyacrylamide dissolution is the even dispersion of the feeding. Generally, the aqueous solution is heated and adjusted to 50-60℃. After starting the mixer, use a mechanical vibration screen to feed (the screen mesh is 10 meshes) to avoid the generation of "large lumps" and "fish-eye" insoluble particles as much as possible, so that the polyacrylamide can be fully dissolved and play a good use effect.

4. Avoid contact with iron: During the dissolution, stirring, conveying and feeding process, use plastic, enamel, aluminum, stainless steel and other materials.

Parameter Category	Parameter Name	Unit	Typical Range/Description
Basic Physical Properties	Appearance	-	White or slightly yellow granules, powder, or colloid; solid products are odorless with good solubility
	Solid Content	%	Solid products: ≥88 (granules/powder); Liquid products: 10-30 (colloid/emulsion type)
	Density (25℃)	g/cm³	Solid: 1.30-1.40; Aqueous solution (0.1% concentration): ≈1.003
	Glass Transition Temperature (Tg)	℃	165-180 (slightly increases with the rise of molecular weight; no obvious melting point, decomposes at high temperatures)
Core Performance Indicators	Molecular Weight (Weight-Average Molecular Weight)	10,000	500-1,800 (mainstream application range; products with higher molecular weights can be customized)
	Hydrolysis Degree	%	0-5 (a key feature of non-ionic type with extremely low hydrolysis degree, distinguishing it from anionic/cationic types; some products may have a slightly higher value due to trace hydrolysis)
	Intrinsic Viscosity (30℃, 1mol/L NaCl)	dL/g	5-20 (positively correlated with molecular weight; the higher the molecular weight, the greater the intrinsic viscosity, and molecular weight can be calculated through this parameter)
	Residual Monomer Content (Acrylamide)	%	≤0.05 (food-grade/drinking water-grade requires ≤0.02; industrial-grade needs to comply with standards such as GB/T 13940-2008)
Solubility & Solution Properties	Dissolution Time (25℃, stirring speed 300rpm)	min	Granular: 30-60; Powder: 15-30 (slow dispersion is required to avoid agglomeration; increasing water temperature can shorten dissolution time)
	Aqueous Solution Viscosity (0.1% concentration, 25℃)	mPa·s	50-500 (significantly increases with the rise of molecular weight and concentration; it is a non-Newtonian fluid, and viscosity decreases as shear rate increases)
	pH Value (0.1% aqueous solution, 25℃)	-	6.0-8.0 (near neutral; does not change the pH of the solution itself, suitable for acid/alkaline systems)
Stability Parameters	Thermal Stability	-	Stable performance when temperature ≤80℃; prone to thermo-oxidative aging and molecular weight reduction when temperature ＞100℃; violent decomposition to produce toxic gases when temperature ＞200℃
	Storage Period (Sealed, Cool & Dry Condition)	Month	Solid granules/powder: 24; Liquid colloid/emulsion: 6-12 (agglomeration and failure may occur due to moisture or high temperature)
Application-Adaptable Parameters	Applicable pH Range	-	1-14 (broad pH adaptability; can maintain flocculation/thickening performance in strong acid/alkaline systems, superior to ionic types)
	Recommended Dosing Concentration (Water Treatment Scenario)	%	0.1-0.3 (excessively high concentration may lead to viscous solution and poor fluidity, affecting application effect)
	Filtration Ratio (Water Treatment Indicator)	-	≥1.5 (reflects floc strength; the higher the filtration ratio, the less likely the flocs are to break, and the higher the solid-liquid separation efficiency)