Advantages of using wax emulsions in the paper industry

2021-12-15   Pageview:69

1, the vast majority of wax emulsions used in the paper industry in the paper selection process will be added to the inner glue, so that the paper fiber inherent absorption mesh with the desired water resistance strength.

2, The wax emulsion can counteract the effect of resin binder when mixed with various pigments, thus improving the printing performance and increasing the printing efficiency. Paper coated in a pulper can usually be further processed and refined by its surface gluing or coating. Development of new varieties of emulsified wax as a hydrophobic agent for the production of printed matter.

3, wax emulsion for man-made boards include fiberboard and particleboard two kinds of boards, these two kinds of boards are wood industry comprehensive utilization of products, its composition in addition to wood fiber or wood chips, but also need a certain proportion of glue material, so that the wood fiber or wood chips after hot pressing treatment. A certain amount of emulsified wax is added to the glue to make the boards water resistant and to improve the surface finish. In the manufacturing process of man-made board, due to the small particle size of emulsified wax, effective breaking of emulsion can make wax particles from the water phase precipitation, uniform adsorption on the wood chip fiber.

 

 

 

 

 

 

 

 

 

 

 

 

The amount of leveling agent used in the powder coating formulation can be calculated based on the total amount of film-forming substances (total amount of resin and curing agent) or the total amount of formulation. Tests and experience have shown that for domestic acrylate polymer leveling agents, when calculated based on the effective ingredients of the leveling agent, the coating film leveling requirements can be met when it is in the range of 0.8% to 1.2% of the total film-forming material. Considering the uniformity of the dispersion of the leveling agent, it is generally appropriate to use a dosage of 1.0% to 1.2%.

Because in the powder coating formulation, the range of the amount of pigments and fillers is relatively wide, and the difference in oil absorption range between different varieties is also relatively large, so according to the variety and amount of pigments and fillers in the formulation, the oil absorption is generally larger or When the dosage is large, it is necessary to appropriately increase the dosage of leveling agent. According to experience, when the amount of leveling agent reaches 1.5% of the total film-forming material, there is no obvious effect on the outer layer of the coating film. Considering the leveling properties of powder coatings, the upper limit of the amount of leveling agent is better, but the storage stability of powder coatings is not good; considering the storage stability of powder coatings, the lower limit of the amount of leveling agent is better. Therefore, according to the specific formulation of the powder coating, considering the appearance of the coating film and the storage stability of the powder coating, it is necessary to select the appropriate leveling type and dosage.

Brighteners improve the wettability of pigments and fillers in resins and curing agents during the manufacturing process of powder coatings. At the same time, the powder coating can better reduce the surface tension during the melting and leveling process, and make the surface and tension distribution uniform, and avoid the disadvantages of pinholes and shrinkage in the coating film. It can also act as a leveling agent. effect.

Brighteners are generally not used in foreign powder coating formulations, but in domestic powder coating formulations, it is a commonly used additive. In domestic epoxy, epoxy-polyester and polyester powder coating formulations, quite a few manufacturers require it. Add light shell agent, especially the wax manufacturers who use domestic acrylate homopolymerization agent, it is used in conjunction with the brightener. As mentioned above, the GLP series leveling agent produced by Ningbo Nanhai Chemical Co., Ltd. is a multifunctional leveling agent, and the manufacturer believes that there is no need for an external brightener. The test results show that after adding brightener to epoxy and epoxy-polyester powder coatings, the appearance of the coating film is significantly improved, but the effect on polyester powder coatings is not as obvious as the first two powder coatings.

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