Sodium polyacrylate – Uses & FAQs

This article is about sodium polyacrylate.


Sodium polyacrylate

Sodium polyacrylate belongs to superabsorbent polymers with the chemical formula [−CH2−CH(CO2K)−]n.

In functionality, it can absorb hundreds of times its weight of water and then turns to water gel form.

In the safety aspect, it’s non-toxic, non-pollutant, and harmless. It’s easy to find the MSDS (Material Safety Data Sheet).

Basic info

Appearancewhite powder/particle (turn to transparent crystal after absorbing water)
Odorimperceptible
CAS number9003-4-7
FunctionAbsorbing, retaining, or blocking liquid
Physical propertyNon-toxic, harmless, non-polluting, natural degradation
Market priceUSD 800-3000 per ton (updated in 2018)

Mechanism

How does sodium polyacrylate work

It consists of a set of polymeric chains that are parallel to each other and regularly linked to each other by cross-linking agents, thus forming a network.

When water comes into contact with one of these chains, it is drawn into the molecule by osmosis. Water rapidly migrates into the interior of the polymer network where it is stored.

Tip: Metal ions can deeply reduce or destroy the water-absorbing capacity of sodium polyacrylate.


Production process


Types

There’re many types of sodium polyacrylate for different uses, such as:

  • starch-based type (which is biodegradable),
  • catalyst improved type (for water blocking of cable),
  • cation type (for concrete additive),
  • *defective type & recycled type (for waste liquid absorption).

Uses

Sodium polyacrylate can

  • be used directly;
  • be used as the raw material of products.

Here are the details:

1. Be used directly

  • for production

water blocking, inflatable rubber, thickening agent, fire-retardant gel, desiccant agent, thermal storage agent.

  • for building

concrete protection, anti-foggy agent.

  • for environment

waste liquid control, excreta collection.

  • other

drilling fluid, collection of tattoo liquid waste, oil-water separation.

2. Be used as a raw material

  • product for animals

pet pads, a drown-free water source for feeder insects.

  • products for personal care

paper diapers, sanitary napkins, nursing mats, and contact lenses.

  • products in home

the ice pack, fragrance carrier, water beads, growing toys, cosmetics, solid waterbed.

  • other

cable, urine bag, anti-flood bag, instant snow, waterproof paint.


FAQs about sodium polyacrylate


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