Polyethylene-polypropylene glycol

Polyethylene-polypropylene glycol is a colorless transparent liquid to white paste to white solid and degradable non-ionic surfactant.

About Polyethylene-polypropylene glycol:  

Physical properties:

Density: Since the density of polyethene and polypropylene is different, the density of this block copolymer will be somewhere in between.

Appearance: Usually in a transparent or translucent solid state.

Thermal properties: Its thermal stability depends on the ratio of polyethene to polypropylene and its molecular weight. Generally, its thermal decomposition temperature is higher than polyethene but lower than polypropylene.

Solubility: It can be dissolved in organic solvents, such as chloroform, tetrahydrofuran, etc.

Chemical properties:

Stability: Since the stability of this polymer depends on its composition and molecular weight, its stability in chemical reactions will vary depending on its molecular structure.

Acid-base properties: under normal circumstances, it is neutral, but it can also be given certain acid-base properties by chemical modification.

Mechanical properties:

Hardness: Its hardness depends on the ratio of polyethylene to polypropylene and is usually harder than polyethylene, but softer than polypropylene.

Elastic modulus: A high elastic modulus indicates good tensile resistance.

Mechanical strength: good impact resistance and wear resistance.

 Technical Parameter of Polyethylene-polypropylene glycol:

Applications of Polyethylene-polypropylene glycol:

Packaging materials: Due to the excellent toughness and transparency of polyethylene-polypropylene glycol, it can manufacture various packaging materials, such as films, containers, and packaging bags. 

Adhesives and sealants: polyethylene-polypropylene glycol has good adhesion and flexibility and can be used as one of the ingredients of adhesives and sealants. It can be used with other polymers or fillers to prepare excellent adhesives and sealants.

Coatings and inks: Polyethylene-polypropylene glycol can be used as an additive or solvent to improve coatings' gloss, levelling and adhesion. It helps to improve the paint's weatherability, scratch resistance, and stain resistance so that the paint and ink have a wider range of uses and longer service lives.

Personal care products include creams, lotions, shampoos, body washes, and more to improve skin condition, maintain skin health, and provide a comfortable user experience.

Medical field: Polyethylene-polypropylene glycol can be used to prepare coatings for medical devices, medical adhesives, and drug carriers. It has good biocompatibility and chemical stability and has an important impact on the performance and safety of medical devices. In addition, in the drug delivery system, polyethylene-polypropylene glycol can be used as a drug carrier or a slow-release material to control the speed and amount of drug release.

Automotive industry: Polyethylene-polypropylene glycol is mainly used to manufacture automotive parts coatings, sealants, and adhesives. It can improve auto parts' weather, corrosion, and wear resistance and extend the service life of cars.

Production Method of Polyethylene-polypropylene glycol:

Direct synthesis

Direct synthesis is a common method for preparing polythylene-polypropylene glycol. In this method, ethylene and propylene are polymerized under the action of a catalyst to produce a block copolymer of polyethene and polypropylene. The specific steps are as follows:

Catalyst selection and preparation: The right catalyst is the key to polymerization. Commonly used catalysts include Ziegler-Natta catalyst, chromium catalyst and metallocene catalyst. The preparation process of the catalyst involves the selection of suitable ligands, metal salts or oxides, etc., and preparing the active catalyst through reduction, complexation or other chemical reactions.

Polymerization reaction: In the polymerization reaction process, ethylene and propylene are mixed in a certain proportion, passed into the polymerization kettle, and polymerization is carried out under the action of the catalyst. 

Product separation and refining: The product is separated and refined after the polymerization reaction. By evaporation, crystallization, filtration and drying, the impurities, such as unreacted monomers, oligomers and catalyst residues, are removed, and polyethene-polypropylene glycol products are obtained.

However, this method requires strict control of polymerization conditions, such as temperature, pressure and raw material ratio, to ensure product quality and stability.

Sulfonation method

Sulfonation is another common method for preparing polythylene-polypropylene glycol. The method is to sulfonate polyethene and polypropylene with concentrated sulfuric acid; sulfuric acid groups replace the hydrogen atoms on the polymer molecular chain, forming polyethene-polypropylene glycol sulfonate. The specific steps are as follows:

Preparation of sulfonating agent: the concentrated sulfuric acid and water are mixed in proportion, passed into the sulfonating kettle, and heated to a certain temperature to prepare the sulfonating agent.

Sulfonation reaction: polyethene and polypropylene are mixed in a certain proportion, passed into the sulfonation kettle, and sulfonated under the action of the sulfonating agent. The sulfonation temperature, pressure, and reaction time have important effects on the degree of substitution and the composition of sulfonate.

Product separation and refining: After the completion of the sulfonation reaction, the product is separated and refined. By evaporation, crystallization, filtration and drying, unreacted polymers, oligomers and sulfates are removed to obtain polyethylene-polypropylene glycol products.

The advantage of sulfonation is that high-purity polyethene-polypropylene glycol products can be obtained, which is suitable for preparing sulfonates with high molecular weight and a high degree of substitution. However, this method requires a large amount of concentrated sulfuric acid and produces a large amount of sulfate waste, which greatly burdens the environment. Therefore, paying attention to environmental protection and waste disposal in actual production is necessary.

Packing & Shipping of  Polyethylene-polypropylene glycol  :
 We have many different kinds of packing which depend on Polyethylene-polypropylene glycol quantity.
  Polyethylene-polypropylene glycol packing: 1kg per bottle or 25kg per barrel.
  Polyethylene-polypropylene glycol shipping: After payment, you can ship your order by sea, air or express.

Polyethylene-polypropylene glycol Properties    

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