CN104017546B - A kind of preparation method of waxiness temperature-sensing valve sensitive medium - Google Patents
A kind of preparation method of waxiness temperature-sensing valve sensitive medium Download PDFInfo
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- CN104017546B CN104017546B CN201310065598.8A CN201310065598A CN104017546B CN 104017546 B CN104017546 B CN 104017546B CN 201310065598 A CN201310065598 A CN 201310065598A CN 104017546 B CN104017546 B CN 104017546B
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Abstract
The invention discloses the preparation method of a kind of waxiness temperature-sensing valve sensitive medium.In the method, it is the ratio mix homogeneously of 0.6～1.4: 1.0: 0.4～1.2 by weight by the positive structure dodecane of industrialized production, positive structure tridecane and the positive structure tetradecane, i.e. obtains product of the present invention.Properties of product prepared by the inventive method are stable, can in the range of 7～0 DEG C temperature control, and the stroke value often spent is basically identical, can be used for controlling electric elements operating ambient temperature waxiness temperature-sensing valve.The present invention is directed to the performance requirement of sensitive medium needed for specific waxiness temperature-sensing valve, selection industrialization product is raw material, simplifies production technology, thus greatly reduces the price of purpose product.
Description
Technical field
The invention belongs to special wax technical field, particularly relate to the preparation method of a kind of waxiness temperature-sensing valve sensitive medium.Specifically, there is solid-liquid phase change, volumetric expansion even variation in sensitive medium prepared by the present invention in the range of-7～0 DEG C.Waxiness temperature-sensing valve (-the 7～0 DEG C) temperature control within the scope of narrower temperature prepared by this sensitive medium, and stroke homogenous linear.This waxiness temperature-sensing valve can be automatically adjusted coolant temperature, thus reaches to automatically control the purpose of electrical equipment element manipulation ambient temperature.
Background technology
Waxiness temperature-sensing valve is the valve of a kind of self-operated type, is to utilize change in volume in sensitive medium phase transition process to control valve opening thus reaches to control the purpose of logistics flux, its have simultaneously sensing, perform, feed back, the several functions such as definite value.This waxiness temperature-sensing valve has that the temperature characterisitic not significant change with system pressure, mechanical strength be high, chemical stability batch production good, easy and install, the advantage such as low cost, stable temperature control are reliable, thus extensively applied in terms of temperature control.
Electronic devices and components needs could be stablized under specific temperature environment, long-term work.In the case of some are inconvenient to keep in repair and environmental temperature fluctuation scope is very big, electronic devices and components must use cooling medium to control the temperature of its working environment, could long-term stable operation.For this situation, active electric sub-control system is used to control the operating ambient temperature of electronic devices and components by controlling the flow of cold and hot fluid at present.This active electronic Control system architecture is complicated, weight greatly, easily lost efficacy, so need to improve.
Compared with this active electric sub-control system, if using waxiness temperature-sensing valve to control temperature, will have the advantages such as volume little, lightweight, simple in construction, dependable performance.Especially to being inconvenient to keep in repair and require the application that working life is longer, waxiness temperature-sensing valve is used to control operating ambient temperature significant to the service life ensureing electronic devices and components.
Using the waxiness temperature-sensing valve prepared by sensitive medium prepared by prior art, temperature control scope is more than 10～15 DEG C；Existing technology of preparing means are with solvent method for many；And the linear degree of stroke is very poor in the range of temperature control, or stroke linear within the scope of relatively wide temperature.Such as: DD
241,829、DD
The patent introductions such as 241,830 are with solvent-extracted method, and the product of preparation is temperature control in the range of 80～90 DEG C.The waxiness temperature-sensing valve prepared by product that the patents such as CN02109668.6, CN200310104909.3, CN200510046426.1 are introduced, stroke homogenous linear in relatively wide temperature range (25 DEG C even 50 DEG C).The preparation method of these patent introductions or environment is had pollution, or the waxiness temperature-sensing valve that thus prepared by product only just can accomplish stroke homogenous linear in wide temperature control scope.
Owing to the character of sensitive medium is the key factor determining waxiness temperature-sensing valve performance, therefore prepare the premise that special sensitive medium is exploitation waxiness temperature-sensing valve.
Summary of the invention
It is an object of the invention to provide a kind of sensitive medium being applicable to waxiness temperature-sensing valve, specifically can in the range of-7～0 DEG C temperature control, and the sensitive medium that the stroke value often spent is basically identical.Sensitive medium of the present invention, is particularly suited for needing the temperature automatically controlled device of stroke homogenous linear, controls coolant temperature especially for by waxiness temperature-sensing valve, thus controls the field of electric elements operating ambient temperature.
The temperature control scope of general waxiness temperature-sensing valve is more than 10～15 DEG C, and this is that the character of the sensitive medium used by it is determined.It is known that the character of sensitive medium is consisting of determining.The object of the invention product needs the character in narrow temperature control scope (-7～0 DEG C) with stroke homogenous linear, this just requires accurately to control its composition, make the normal paraffin content height of product, carbon number distribution narrower, and the ratio of the hydrocarbon component of various carbon number is close.
The pertroleum wax series products of industrialized production, mainly has with oil as raw material at present, through the paraffin of technique production, microwax products such as distillation → solvent dewaxing → solvent deoilings, and the liquid paraffin product produced through distillation → dewaxing by molecular sieve or urea dewaxing.These products are the mixture of n-alkane and isoparaffin, and carbon number distribution is wider, it is impossible to be directly used as waxiness temperature-sensing valve sensitive medium.
Waxiness temperature-sensing valve is the volumetric expansion utilizing sensitive medium, and for isoparaffin, n-alkane has bigger volumetric expansion, and therefore in waxiness temperature-sensing valve sensitive medium, normal paraffin content is the highest the most favourable to volumetric expansion performance；For temperature control scope, it is desirable to sensitive medium has suitable carbon number distribution；For stroke homogenous linear, it is desirable in sensitive medium, the hydrocarbon component ratio of various carbon numbers is close.
Waxiness temperature-sensing valve sensitive medium is typically with pertroleum wax series products as raw material, removes isoparaffin therein through various purification modes, and makes n-alkane have suitable carbon number distribution；For reaching special expansion character, in addition it is also necessary to the n-alkane of different carbon number distribution is mixed in proportion.This mode of production complex process, makes production cost too high, and product property is not easy accurately to control.
The present invention is by the further investigation to sensitive medium composition and expansion character relation, for the performance requirement of sensitive medium needed for specific waxiness temperature-sensing valve, selection industrialization product is raw material, in specific proportions mix homogeneously, i.e. can get waxiness temperature-sensing valve sensitive medium of the present invention.The composition of sensitive medium can accurately be controlled by preparation method of the present invention, thus reaches to control the purpose of product property；Although cost of material is slightly above the price of pertroleum wax series products, but production technology is simple, greatly reduces the price of purpose product, is conducive to promoting the use of of this product.
The preparation method of a kind of waxiness temperature-sensing valve sensitive medium of the present invention includes:
Select the positive structure dodecane of content (preferred content is more than 98%) industrialized production more than 95%, positive structure tridecane and the positive structure tetradecane, it is ratio (preferred weight ratio is 0.9～1.1: 1.0: the 0.8～1.0) mix homogeneously of 0.6～1.4: 1.0: 0.4～1.2 by weight, i.e. obtains the waxiness temperature-sensing valve sensitive medium of the present invention.
In the inventive method, the Paraffin liquid heavy that described positive structure dodecane, positive structure tridecane and the positive structure tetradecane are usually the liquid paraffin produced with dewaxing by molecular sieve or urea dewaxing produces is as raw material, through industrialization product prepared by precise distillation.
The invention have the advantage that for the performance requirement of sensitive medium needed for specific waxiness temperature-sensing valve, selection industrialization product is raw material, simplifies production technology, thus greatly reduces the price of purpose product by sensitive medium forms the association to expansion character.The properties of product of preparation method of the present invention are stable, can in the range of-7～0 DEG C temperature control, and the stroke value often spent is basically identical, can be used for controlling electric elements operating ambient temperature waxiness temperature-sensing valve.The physics of sensitive medium of the present invention, stable chemical nature, when being used for preparing waxiness temperature-sensing valve, it is possible to obtain good using effect, and has longer service life.
Accompanying drawing explanation
Fig. 1 and Fig. 2 is respectively the expansion character curve of the temperature-sensitive medium used for wax temperature control valve of embodiment 1 and embodiment 2 preparation, and in figure, abscissa is temperature, and vertical coordinate is relative travel amount.
Detailed description of the invention
Waxiness temperature-sensing valve is utilized to have the characteristic that temperature sensor changes and makes corresponding adjustment, being automatically adjusted of electronic devices and components operating ambient temperature can be applied to, its principle is to sense the mixed temperature of cold and hot fluid by it, it is automatically adjusted the flow of cold and hot fluid, thus reaches to be automatically adjusted the temperature of blending agent and then the purpose of regulation electronic devices and components operating ambient temperature.
Preparation method and the expansion character of the sensitive medium of the present invention are described by the following examples.
Embodiment 1
Select commercially available positive structure dodecane, positive structure tridecane, the positive structure tetradecane (content is 98.5%), be the ratio mix homogeneously of 0.9: 1.0: 0.8 by weight, i.e. obtain waxiness temperature-sensing valve sensitive medium.
The expansion character curve of the waxiness temperature-sensing valve sensitive medium being made up of this product is as shown in Figure 1.
Embodiment 2
Select commercially available positive structure dodecane, positive structure tridecane, the positive structure tetradecane (content is 98.5%), be the ratio mix homogeneously of 1.1: 1.0: 1.0 by weight, i.e. obtain waxiness temperature-sensing valve sensitive medium.
The expansion character curve of the waxiness temperature-sensing valve sensitive medium being made up of this product is as shown in Figure 2.
Claims (6)
1. a preparation method for waxiness temperature-sensing valve sensitive medium, including herein below:
It is the ratio mix homogeneously of 0.6～1.4: 1.0: 0.4～1.2 by weight by the positive structure dodecane of industrialized production, positive structure tridecane and the positive structure tetradecane, i.e. obtains product.
The most in accordance with the method for claim 1, it is characterized in that, the Paraffin liquid heavy that described positive structure dodecane, positive structure tridecane and the positive structure tetradecane are the liquid paraffin produced with dewaxing by molecular sieve or urea dewaxing produces is as raw material, through industrialization product prepared by precise distillation.
The most in accordance with the method for claim 1, it is characterised in that the content of described positive structure dodecane, positive structure tridecane and the positive structure tetradecane is more than 95%.
The most in accordance with the method for claim 1, it is characterised in that the content of described positive structure dodecane, positive structure tridecane and the positive structure tetradecane is more than 98%.
The most in accordance with the method for claim 1, it is characterised in that the weight ratio of described positive structure dodecane, positive structure tridecane and the positive structure tetradecane is 0.9～1.1: 1.0: 0.8～1.0.
6. the waxiness temperature-sensing valve sensitive medium that claim 1-5 either method obtains, they are temperature control in the range of-7～0 DEG C, and the stroke value often spent is basically identical.
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| CN102465022A (en) * | 2010-11-04 | 2012-05-23 | 中国石油化工股份有限公司 | Preparation method for temperature-sensitive medium used for wax temperature control valve |
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| CN102465022A (en) * | 2010-11-04 | 2012-05-23 | 中国石油化工股份有限公司 | Preparation method for temperature-sensitive medium used for wax temperature control valve |
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