How do you distinguish between acetate and polypropylene?

Acetate: Yellow after ignition, slightly sour;

Polypropylene: Yellow flame on a blue background when ignited.

Cellulose acetate.

Refers to acetic acid as a solvent, acetic anhydride.

As an acetylating agent, it is esterified under the action of a catalyst to obtain a thermoplastic resin.

It is the first cellulose organic ester to be commercialized and continuously developed among cellulose derivatives. As a porous membrane material, cellulose acetate has the characteristics of high selectivity, large water permeability and simple processing.

Polypropylene is a thermoplastic resin made from the polymerization of propylene. According to the position of methyl arrangement, it is divided into three types: isometric polypropylene, random polypropylene and inter-conventional polypropylene.

The methyl group is arranged on the same side of the molecular backbone called isometric polypropylene, if the methyl group is arranged in an orderly manner on both sides of the molecular backbone, it is called random polypropylene, and when the methyl group is alternately arranged on both sides of the molecular backbone, it is called interconventional polypropylene. Polypropylene resin produced in general industry.

The content of the isometric structure is about 95%, and the rest is random or inter-gauge polypropylene. Industrial products are mainly composed of isometric substances. Polypropylene also includes copolymers of propylene with a small amount of ethylene.

It is usually a translucent colorless solid, odorless and non-toxic. Due to the regular structure and high crystallization, the melting point can be as high as 167. Heat-resistant, corrosion-resistant, products can be sterilized by steam is its outstanding advantages.

With its low density, it is the lightest general-purpose plastic. The disadvantage is that the low temperature impact resistance is poor and it is easy to age, but it can be overcome by modification.

Copolymer type PP material.

It has a low heat deflection temperature (100 °C), low transparency, and low gloss.

Low rigidity, but stronger impact strength, the impact strength of PP increases with the increase of ethylene content. The Vicat softening temperature of PP is 150. Due to the crystallinity.

High, the surface stiffness and scratch resistance of this material are good. PP does not have the problem of environmental stress cracking.

The melt mass flow rate (MFR) of PP is typically 1 100. PP materials with low MFR have better impact resistance but lower elongation strength. For materials with the same MFR, the impact strength of the copolymer type is higher than that of the homopolymer type.

Due to crystallization, the shrinkage of PP is quite high, generally.

Cellulose acetate: Also known as cellulose acetate, cellulose acetate. Cellulose acetate is a man-made fiber prepared by esterification reaction of acetic acid and cellulose as raw materials.

The structural formula can be expressed as: [(C6H7O2)(OOCH3)3]N. Polypropylene:

The molecular structure is a typical body structure, which is a crystalline polymer with a molecular weight of 10.5 million. Specific gravity: grams cubic centimeters Molding shrinkage:

Molding temperature: 160-220 Features: Small degree, strength, stiffness, hardness and heat resistance are better than low-pressure polyethylene, can be used at about 100 degrees.

It has good electrical properties and high-frequency insulation, which is not affected by humidity, but becomes brittle, wear-resistant, and easy to age at low temperatures. It is suitable for making general mechanical parts, corrosion-resistant parts and insulating parts.

Molding characteristics: 1The crystalline material has low hygroscopicity, is prone to melt rupture, and is easy to decompose in long-term contact with hot metals.

2.The fluidity is good, but the shrinkage range and shrinkage value are large, and it is easy to shrink holes. Dents, deformations.

3.The cooling speed is fast, the pouring system and cooling system should dissipate heat slowly, and pay attention to controlling the molding temperature. When the material temperature is low and high pressure, it is easy to orient, and when the mold temperature is lower than 50 degrees, the plastic parts are not smooth, and it is easy to produce poor welding, flow marks, and warping deformation above 90 degrees.

4.The thickness of the plastic wall must be uniform, to avoid lack of glue, sharp corners, to prevent stress concentration.

Cellulose acetate, also known as cellulose acetate, cellulose acetate, is the acetate of cellulose and was first prepared in 1865. Cellulose acetate is used in photography to make the substrate of negatives and is also a component of some adhesives. Acetate prova is also used in man-made fibers.

Polypropylene (PP) is a semi-crystalline thermoplastic. It has high impact resistance, strong mechanical properties, and resistance to a variety of organic solvents and acid and alkali corrosion. It has a wide range of applications in the industry and is one of the common polymer materials.

Acetate fibers are soft and cool to the touch; Polypropylene is shriveled and hot to the touch.

Polypropylene cannot be dyed at all, and acetate fibers can be dyed with many dyes. Get some disperse dyes or direct dyes and boil them, the polypropylene is still white, and the acetate is dyed.

After scientific experiments, the method of discrimination is very simple:

Acetate filter: After use, the smoke color of the filter near the mouth is evenly diffused, and the flame is yellow and slightly sour after ignition;

Polypropylene filter: After use, the smoke color of the proximal end of the filter is diffuse in the center, and the yellow ring around the periphery is the lightest, and it has a yellow flame on a blue background after ignition.

Summary. The difference between acetate fabric and polyester fiber is that their fiber characteristics are different, the fiber in acetate fabric belongs to man-made cellulose fiber, which is more hygroscopic, soft to feel, not easy to produce static electricity, and is generally used as a lining for high-end clothing and some fashion clothing. Polyester fiber is what we usually call polyester, and the fiber in it is also the most common synthetic fiber.

Although the hygroscopicity of polyester fibers is not very good, it is easy to generate static electricity. However, it is also widely made into fabrics of different types of fabrics, and at the same time has different uses, and it is relatively cheaper.

The difference between acetate fabric and polyester fiber is that their characteristics are different, the fiber in acetate fabric belongs to man-made cellulose fiber, which is more hygroscopic, and the stool is softer and not easy to produce static electricity, and is generally used as a lining for high-end clothing and some fashion clothing. Polyester fiber is what we usually call polyester, and the fiber in it is also the most common synthetic fiber. Although the hygroscopicity of polyester fibers is not very good, it is easy to generate static electricity.

However, it is also widely made into fabrics of different types of fabrics, and at the same time has different uses, and it is relatively cheaper.

Bought a fake.

Acetate fabric is not polyester. Acetate fabric is acetate fiber, which is a man-made fiber prepared by esterification reaction of acetic acid and cellulose as raw materials, and can imitate silk fiber, manufactured by advanced textile technology, with bright colors and bright appearance. Features of acetate fabric:

1. Good thermoplastic acetate fiber softens at 200-230 and melts at 260, and this characteristic makes acetate fiber noisy and curved, similar to synthetic fiber, and the shape does not return after plastic deformation, and has permanent deformation. The formability of acetate fabric is good, it can beautify the curves of the human body, and the whole is generous and elegant. 2. Excellent dyeing acetate fibers can usually be dyed with disperse dyes, and the coloring performance is good, the color is bright, and its coloring performance is better than that of other cellulose fibers.

The acetate fabric has good thermoplasticity, acetate fiber softens at 200 -230 and melts at 260, similar to synthetic fiber, the shape will not return after plastic deformation, and it has permanent deformation.

Fiber Type: Bundled Monofilament Density:

Fiber fineness: 10 18dtex Melting point: 165 175

Breaking strength: 350MPa Ignition point: 590

Breaking length: 15% 20% Fiber specification: 3-60mm

Modulus of elasticity: 3500MPa Acid and alkali resistance: strong.

Cross-sectional shape: O-type or Y-type Water absorption: %

At a minimum, the chemical properties should meet the above standards.

Then there is the slump and expansion of the polypropylene fiber reinforced concrete mixture, which should be the following standards.

Fiber content slump to expansion do 1 hour slump t1 1 hour expansion d1

kg/m3 mm mm mm mm