Paraffin wax emulsion as well as preparation method and application thereof

Abstract

The invention discloses a paraffin wax emulsion as well as a preparation method and an application thereof, belonging to the field of waterproof agents of an artificial board. The paraffin wax emulsion comprises the following components: wax, hydrophilic non-ionic surfactant, grease and water. The paraffin wax emulsion can replace paraffin wax with the same weight as a waterproof agent and can effectively increase the water resistance of an artificial board. The water absorption thickness swelling rate and the mechanical capacity of a shaving board which is prepared by using the paraffin wax emulsion as the waterproof agent can satisfy a national standard GB / T 4897-92 requirement. The paraffin wax emulsion has good mechanical stability and long preservation period above 1 year, can resist acid, alkali and hard water and be easy to break emulsion at hot pressure. The cost of each kilogram of paraffin wax emulsion is lower than 20 percent of the cost of the paraffin wax, and the production cost of an enterprise can be greatly reduced.

Description

technical field [0001] The invention relates to a wood-based panel waterproofing agent and a preparation method thereof, in particular to a paraffin wax emulsion and a preparation method thereof. The invention also relates to the application of the paraffin wax emulsion in preparing particle boards, belonging to the field of wood-based panel waterproofing agents. Background technique [0002] Because wood has free hydroxyl groups, negative charges on the surface of fibers, and capillary and osmotic effects, wood materials have the characteristics of hygroscopicity and water absorption. Therefore, wood-based panels are affected by changes in air humidity during use, and their moisture content, thickness, and length will change, which will cause warping and deformation of wood-based panels, and even affect the bonding strength. Therefore, the water absorption thickness expansion rate of wood-based panels is an important indicator to measure its material properties. This index...

AI Technical Summary

Problems solved by technology

Most anionic surfactant formulations are sensitive to acid, alkali, and hard water. After mixing with glue, it is easy to break the emulsion and agglomerate, but it is not easy to be detected by the naked eye. This is an important reason for the decrease in the efficiency of waterproofing agents.

[0009] (3) Demulsibility by hot pressing

[0013] (1) During the hot-pressing process of wood-based panels, there is often a phenomenon that unmelted paraffin is wrapped in glue droplets. This part of paraffin cannot form a wax film on the surface of shavings or fibers, so it does not have a waterproof effect, resulting in waste of paraffin

[0014] (2) Paraffin water repellent needs to be applied in a molten liquid state, and the use temperature is high, which is prone to operational accidents such as burns, and the paraffin is easy to block the delivery pipeline after condensation;

[0015] (3) The price of paraffin wax increases year by year, which increases the production cost of wood-based panels

[0016] Due to the many problems of using solid paraffin as a waterproofing agent for wood-based panels, more and more wood-based panel companies at home and abroad are researching and developing the technology of using paraffin wax emulsion as a waterproofing agent for wood-based panels. However, at present, the domestic paraffin emulsion still has the following problems. to a wide range of applications:

[0017] 1) The waterproof effect of paraffin emulsion is not as good as that of paraffin. The reason is that the paraffin used in the production of water repellent itself has poor waterproof effect, and the emulsification effect of the emulsion is poor. The size and distribution of solid particles in the emulsion are uneven, resulting in uneven dispersion on the fiber;

[0018] 2) The mechanical stability and shear resistance of paraffin wax emulsion are poor, which leads to demulsification during use; improper selection of emulsifier and poor operability of emulsification process, paraffin wax emulsion waterproofing agent often breaks demulsification and clogs the nozzle during use phenomenon, which brings great inconvenience to production

[0019] 3) Due to the poor adsorption of paraffin wax emulsion to fibers, or the poor waterproof effect of paraffin wax itself, the long-lasting waterproof effect is poor

[0020] 4) There are too many emulsifiers used in the paraffin emulsion, and the polarity of the emulsifier is too high, which affects the curing of the adhesive, so it has a negative impact on the physical and chemical indicators of the board

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