What are the chemical properties of BOPP color thermal synthetic paper?

The chemical characteristics of BOPP color thermal synthetic paper are mainly reflected in the composition and properties of its thermal coating and substrate (BOPP film). The following is a detailed analysis of its chemical properties:

First, the chemical characteristics of heat-sensitive coatings

1. Leuco dyes and developing agents:

Dark dye: This is the key to achieving color in thermal synthetic paper. The leuco dye itself is colorless at room temperature, but when stimulated by heat, it will chemically react with the color developer (usually an acidic substance) in the coating to produce colored compounds, which will show the color on the paper. The type and formulation of the leach dye determines the final color type and effect.

2. Chemical stability:

The chemicals in the heat-sensitive coating need to have good chemical stability to ensure that no unexpected reactions occur during storage and use, affecting the printing effect and storage life of the paper.

3. Environmental protection:

With the improvement of environmental awareness, the thermal coating of modern BOPP color thermal synthetic paper often uses environmentally friendly dark dyes and additives to reduce environmental pollution.

Second, the chemical properties of BOPP film substrate

1. Polypropylene (PP) chemical stability:

BOPP film is made of polypropylene particles formed by co-extrusion sheet, and then stretched in both vertical and horizontal directions. Polypropylene is a chemically stable material, in addition to strong acids (such as fuming sulfuric acid, nitric acid) have a corrosive effect on it, insoluble in other solvents, only some hydrocarbons have swelling effect on it.

2. Stretching and orientation:

The directional arrangement of polypropylene molecules by bidirectional drawing process significantly improves the mechanical strength, air tightness, moisture barrier and cold resistance of the film. This directional stretching also greatly improves the transparency and gloss of the film.

3. Compound properties of thermal synthetic paper:

Because BOPP film has good chemical stability and physical properties, it is often used as a base material for thermal sensitive synthetic paper. In the composite process of thermal coating and BOPP film, it is necessary to ensure a good bonding force between the two to ensure the overall performance of thermal synthetic paper.

Third, other chemical properties

1. Heat resistance:

BOPP film has a high heat resistance, the use temperature can be as high as 120℃, which makes BOPP color thermal synthetic paper in a higher temperature environment can also maintain stable printing effect and physical properties.

2. Moisture resistance:

BOPP film has excellent water resistance and is one of the best materials for moisture resistance, with very low water absorption (<0.01%). This feature enables BOPP color thermosensitive synthetic paper to maintain good printing results and storage stability in humid environments.

3. Printability:

Although the printing performance of BOPP film itself is poor, its printing performance can be improved by methods such as surface corona treatment. This allows BOPP color thermal synthetic paper to meet the requirements in the need for printing.

To sum up, the chemical characteristics of BOPP color thermal synthetic paper mainly include the reaction characteristics of the thermal coating with dark dye and color development agent, chemical stability, environmental protection, and the chemical stability of polypropylene, tensile and orientation properties, heat resistance, moisture resistance and printability of BOPP film substrate. These characteristics together determine the wide application of BOPP color thermal synthetic paper in printing, packaging and other fields.