In the preparation process of HPMC solution, the general way that adopts pure water directly to dissolve, because it is containing a large amount of water, when running into water sensitive when doing binding agent and meeting the product of the oxidizable destruction of water, as vitamin C (ascorbic acid), in pelletization, very easily there is oxidation and destroy, cause product in the storage life to destroy, to manufacturer, causing larger loss, is also the waste of resource.
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Summary of the invention
The technical issues that need to address of the present invention are just to overcome the defect of prior art, a kind of preparation method of HPMC solution is provided, it adopts ethanol to do solvent in preparation process, effectively reduce oxidation and destruction to the product of water sensitive and the oxidizable destruction of chance water, thereby make final product there is higher stability, and purity is good, is convenient to commercial production.
For addressing the above problem, the present invention adopts following technical scheme:
The invention provides a kind of preparation method of HPMC solution, the HPMC of 1 ~ 2 part of weight portion is added in 50 ~ 100 parts of dehydrated alcohol, stir, HPMC moistening in ethanol is disperseed, add gradually 5 ~ 10 parts of pure water, stir, standing 10 ~ 30 minutes, be made into HPMC solution.
HPMC solution prepared by the present invention has certain viscosity, can be used as pelletize serosity for the pelletization to water sensitive and the oxidizable destruction product of chance water.
The present invention, by first moistening dispersion in ethanol of HPMC, finally adds appropriate pure water to inspire the viscosity of HPMC; The viscosity of HPMC solution is showed, and water content is lower; The weight concentration of the HPMC solution of preparation is 2-4%.
Thereby, the invention has the advantages that:
Preparation HPMC solution adopts containing alcoholic solution does solvent, effectively reduces the Oxidative demage running into the product of water sensitive and the oxidizable destruction of chance water, thereby makes final product have higher stability, and purity is good, is convenient to commercial production.
HPMC can be divided into instant type (Surface treated) and hot soluble type (Non-surface treated). The instant product is rapidly dispersed in cold water and disappears into the water. At this time, the liquid has no viscosity because HPMC is only dispersed in water and there is no real dissolution. About 2 minutes, the viscosity of the liquid gradually increased to form a transparent viscous colloid. Hot-soluble type, lumped in cold water, but in hot water, quickly disperse, disappear in hot water, until the temperature drops to a certain temperature, the viscosity slowly appears until a transparent viscous colloid is formed. The reason for lumping in the cold water is that the outer cellulose powder encounters cold water, immediately starts to have a viscosity, thickens into a transparent colloid, and the cellulose inside is not in contact with water, and is surrounded by the colloid, or is powdery, but slowly dissolves. In practical applications, it is not necessary to use hot water to dissolve hot-melt products, because the putty powder or mortar is powder. After dry mixing, the cellulose is separated by other materials. When it meets water, it will immediately become viscosity and will not have lumps. The hot-dissolved type can only be used in putty powder and mortar. In liquid glue and paint, there will be lumped. It is available in a wide range of applications for instant type (Surface treated) , in putty powder and mortar, as well as in liquid glues and coatings. There are no contraindications. However, for instant type (Surface treated), it&#;s water retention and stability are not comparable to hot soluble type (Non-surface treated). Therefore, we recommend hot soluble type (Non-surface treated) in dry powder such as putty powder and mortar.
Hot soluble type (Non-surface treated) HPMC dissolution methods
If the hot soluble type (Non-surface treated) HPMC is added directly to the water, agglomeration will occur before dissolution. However, dissolving in this way is very slow and difficult. Here we recommend three dissolution methods for end users based on different applications&#;
1 Hot water dissolution method: Since HPMC is not dissolved in hot water, the initial HPMC can be uniformly dispersed in hot water and then rapidly dissolved upon cooling. Two typical methods as follows:
Adding hot water(85°C) into the container. Hydroxypropyl methylcellulose was gradually added with slow stirring, and the HPMC floated on the surface of the water, and then gradually formed a slurry, and the slurry was cooled with stirring.
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Adding 1/3 or 2/3 of the required amount of hot water(85°C) to the vessel , gradually add HPMC to hot water and keep stirring. Cold water or ice water is then added to the hot cement slurry to achieve the desired level. Stirring is continued to cool the mixture.
2 Powder mixing method: Mix the HPMC powder with a large amount of other powdery substances, mix well with a blender, and then add water to dissolve. At this time, HPMC can be dissolved without agglomeration, because each tiny small corner has only a little HPMC. The powder will dissolve immediately upon contact with water. &#; This method is used by putty powder and mortar manufacturers.
3 Organic solvent humidification dissolution method: HPMC is pre-dispersed or wetted with an organic solvent such as ethanol, ethylene glycol or oil, and then dissolved in water, and HPMC can be easily dissolved.
Instant type (Surface treated) HPMC dissolution methods
Surface treatment powders are specially developed to prevent lumping in wet-mixing applications such as paint and emulsion applications. In order to prepare a solution from the surface-treated powder, the powder is directly placed in cold water. Over time, a fully developed solution of suitable viscosity was prepared by continuously stirring the solution.
Note: In order to dissolve quickly, the instant type (Surface treated) HPMC will dissolve rapidly after adjusting PH value to 8-10 by adding ammonia or alkali water, forming a solution.
NON-SURFACE TREATED HPMC
In short, for different types of products, the correct method can be fully dissolved. If agglomeration occurs during dissolution, it is caused by insufficient agitation or direct addition of ordinary models to cold water. At this time, it should be stirred quickly. In addition, if bubbles are generated during dissolution, it can be left to stand or defoamer added.
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