阅读说明：本技术 一种陶瓷膜膜元件的浇铸方法 (Casting method of ceramic membrane element ) 是由 黄凤祥 姚萌 洪昱斌 方富林 蓝伟光 于 2020-05-15 设计创作，主要内容包括：本发明公开了一种陶瓷膜膜元件浇铸的浇铸方法,包括如下步骤：(1)将陶瓷膜膜元件的端部插入呈液态的热熔胶中进行封端处理,再将上述端部取出以接触常温的空气,以自然降温至热熔胶固化,获得封端后的陶瓷膜膜元件；(2)用粘结剂将上述陶瓷膜膜元件的端部与外结构件浇铸在一起；(3)待上述粘结剂凝固后,再加热至上述热熔胶呈液态,使热熔胶液化后流走,即浇铸完成。本发明通过特定规格的热熔胶对陶瓷膜膜元件进行浇铸前封端处理,由于该热熔胶树脂粘度适合,不会渗入到陶瓷膜纵向通道中,能提高有效膜元件过滤通道,且该热熔胶固化时间快,能很大程度上提高生产效率。(The invention discloses a casting method for ceramic membrane element casting, which comprises the following steps: (1) inserting the end part of the ceramic membrane element into a liquid hot melt adhesive for end capping treatment, taking out the end part to contact with air at normal temperature, and naturally cooling until the hot melt adhesive is solidified to obtain the ceramic membrane element subjected to end capping; (2) casting the end part of the ceramic membrane element and the outer structural member together by using an adhesive; (3) and after the adhesive is solidified, heating until the hot melt adhesive is in a liquid state, and liquefying the hot melt adhesive and then flowing away, namely finishing casting. According to the invention, the ceramic membrane element is subjected to end sealing treatment before casting by using the hot melt adhesive with a specific specification, and the viscosity of the hot melt adhesive resin is proper, so that the hot melt adhesive resin cannot penetrate into a longitudinal channel of the ceramic membrane, the filtering channel of the ceramic membrane element can be improved, the curing time of the hot melt adhesive is short, and the production efficiency can be improved to a great extent.)

1. A casting method of a ceramic membrane element is characterized by comprising the following steps: the method comprises the following steps:

(1) inserting the end part of the ceramic membrane element into a liquid hot melt adhesive with the temperature of 150-; the hot melt adhesive has the melt viscosity of 1000-15000cps at 170 ℃;

(2) casting the end part of the ceramic membrane element and the outer structural member together by using an adhesive;

(3) and after the adhesive is solidified, heating until the hot melt adhesive is in a liquid state, and liquefying the hot melt adhesive and then flowing away, namely finishing casting.

2. The casting method as claimed in claim 1, wherein: the hot melt adhesive is one with melt viscosity of 3000-8000cps at 170 ℃.

3. The casting method as claimed in claim 1, wherein: the end-capping time is 0.005-0.2 h.

4. The casting method as claimed in claim 3, wherein: the end-capping time was 0.1 h.

5. The casting method as claimed in claim 1, wherein: the natural cooling time is 0.05-0.2 h.

6. Casting method according to claim 5, characterized in that: the natural cooling time is 0.2 h.

7. The casting method as claimed in claim 1, wherein: the temperature of the liquid hot melt adhesive is 170 ℃, the sealing treatment time is 0.1h, and the natural cooling time is 0.2 h.

8. The casting method as claimed in claim 1, wherein: the binder is epoxy resin or polyurethane resin.

9. The casting method as claimed in claim 1, wherein: and centrifugally or statically casting the ceramic membrane element subjected to end sealing and an outer structural member together.

10. The casting method as claimed in claim 1, wherein: the ceramic membrane element comprises a tubular ceramic membrane, a flat ceramic membrane, a disc-type ceramic membrane and a porous ceramic membrane.

Technical Field

The invention belongs to the technical field of membrane element treatment, and particularly relates to a casting method of a ceramic membrane element.

Background

Compared with organic membranes, ceramic membranes have the advantages of strong permeability, high mechanical strength, acid and alkali resistance, organic solvent resistance and the like, so that the ceramic membranes occupy an important place in the fields of clean production and water treatment. The ceramic membrane can be divided into four types, namely a tubular type, a flat plate type, a disc type and a multichannel type according to different support bodies. According to different operation modes, the ceramic membrane module can be divided into an external type and an immersion type, the external type membrane module can be divided into a tubular type ceramic membrane, a tubular type flat plate ceramic membrane and a tubular type porous ceramic membrane at present, the ceramic membrane element is generally integrated with a stainless steel flower plate and a stainless steel membrane shell into a membrane module through a sealing ring, a single membrane element can be replaced, the maintenance is simple and convenient, and the problems of complex installation, high cost, poor chloride ion pitting corrosion resistance and the like exist. The other method is a casting mode, the ceramic membrane element and the plastic membrane shell are cast and bonded together by using epoxy resin or polyurethane resin, the membrane shell is low in cost, large in membrane area and suitable for water treatment, but epoxy resin or polyurethane penetrates through a longitudinal channel of the ceramic membrane in the casting process and permeates into the membrane, so that membrane holes are blocked, and effective filtration holes of the membrane element of the module are reduced.

The conventional operation at present is to carry out end-capping treatment on a ceramic membrane element before casting, adopt silica gel or transparent adhesive tape to carry out the end-capped ceramic membrane element, carry out casting on the ceramic membrane after end capping, cut off the end capping after casting is finished, and expose a longitudinal channel of the ceramic membrane. However, this solution has the following problems: the end-capping efficiency is low and the operation time is long. The shell surface after casting needs mechanical cutting treatment, and the ceramic membrane element has high hardness, difficult cutting and complex working procedures. The mechanical cutting treatment wastes the effective area and casting materials of the ceramic membrane element, and simultaneously generates solid waste of colloid and the ceramic membrane, so that the solid waste treatment is difficult, the cost is high, and the environment is polluted. In addition, after casting is finished, the ceramic membrane element is rigidly connected with the colloid, and strong mechanical vibration is generated during mechanical cutting treatment, so that the bonding force between the ceramic membrane element and the colloid is weakened, and the risk that the ceramic membrane element falls off from the colloid is increased.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a casting method of a ceramic membrane element.

The technical scheme of the invention is as follows:

a casting method of a ceramic membrane element comprises the following steps:

(1) inserting the end part of the ceramic membrane element into a liquid hot melt adhesive with the temperature of 150-; the hot melt adhesive has the melt viscosity of 1000-15000cps at 170 ℃;

(2) casting the end part of the ceramic membrane element and the outer structural member together by using an adhesive;

(3) and after the adhesive is solidified, heating until the hot melt adhesive is in a liquid state, and liquefying the hot melt adhesive and then flowing away, namely finishing casting.

In a preferred embodiment of the present invention, the hot melt is one having a melt viscosity of 3000-.

In a preferred embodiment of the present invention, the capping treatment time is 0.005 to 0.2 h.

Further preferably, the time of the end-capping treatment is 0.1 h.

In a preferred embodiment of the present invention, the natural cooling time is 0.05 to 0.2 h.

Further preferably, the time of natural cooling is 0.2 h.

In a preferred embodiment of the present invention, the temperature of the hot melt adhesive in a liquid state is 170 ℃, the time of the end capping treatment is 0.1h, and the time of natural temperature reduction is 0.2 h.

In a preferred embodiment of the present invention, the binder is an epoxy resin or a polyurethane resin.

In a preferred embodiment of the invention, the end-capped ceramic membrane element is centrifugally or statically cast together with the outer structural member.

In a preferred embodiment of the present invention, the ceramic membrane element includes a tubular ceramic membrane, a flat ceramic membrane, a disc ceramic membrane, and a porous ceramic membrane.

The invention has the beneficial effects that:

1. the invention adopts specific hot melt adhesive for end sealing treatment, the hot melt adhesive is solid at normal temperature, the viscosity is gradually reduced along with the temperature rise, when the temperature is higher than the melting point, the hot melt adhesive is liquid, the viscosity is greatly reduced and has certain viscosity, the end part of a ceramic membrane element is contacted with the hot melt adhesive, the hot melt adhesive can be quickly adhered to a ceramic membrane longitudinal channel, and then the temperature of the hot melt adhesive is gradually reduced and is quickly solidified into a solid state under the room temperature condition, so that the end part of the ceramic membrane longitudinal channel is sealed.

2. The liquid hot melt adhesive has good fluidity, low viscosity and low hardness, and can smoothly flow in gaps between ceramic membrane elements. And after the hot melt adhesive is cured, integrally sealing the longitudinal channel on the end face of the ceramic membrane.

3. According to the invention, after the adhesive is solidified, the end part of the ceramic membrane element sealed by the hot melt adhesive is heated, and the hot melt adhesive flows out after being heated and melted, so that the longitudinal channel of the ceramic membrane returns smoothly without mechanical treatment such as cutting, and the hot melt adhesive can be repeatedly used.

4. According to the invention, the ceramic membrane element is subjected to end sealing treatment before casting by using the hot melt adhesive with a specific specification, and the viscosity of the hot melt adhesive resin is proper, so that the hot melt adhesive resin cannot penetrate into a longitudinal channel of the ceramic membrane, the filtering channel of the ceramic membrane element can be improved, the curing time of the hot melt adhesive is short, and the production efficiency can be improved to a great extent.

5. The hot melt adhesive can ensure that the longitudinal channels of all ceramic membrane element can be completely sealed before casting.

6. After the casting is finished, the end face heating mode is adopted, so that the longitudinal channel of the ceramic membrane is recovered smoothly, mechanical treatment such as cutting is not needed, and the process flow is short.

7. The end of the ceramic membrane element cast by the method does not need to be cut, the effective membrane area of the membrane element cannot be lost, solid waste cannot be generated, and the method is environment-friendly; meanwhile, the binding force between the ceramic membrane element and the colloid is not reduced.

8. The hot melt adhesive remained at the end sealing can be repeatedly heated for use, and waste can not be caused.

9. The specific comparative effects of the invention with respect to ordinary casting are shown in the following table:

Detailed Description

The technical solution of the present invention is further illustrated and described by the following detailed description.

The following examples and comparative examples all used alumina ceramic membrane modules of the same type and the same ceramic membrane manufacturer. The measuring and calculating method of the effective filtration porosity of the membrane element comprises the following steps:

and counting the number of casting defect holes according to the number of the holes with uneven surfaces of the components after casting is finished.

The adhesive force between the ceramic membrane element and the colloid after casting is determined by reference to GB/T7124-2008 adhesive tensile shear strength (rigid material to rigid material).

Firstly, effective filtration porosity and casting defect pores of the membrane element which is not subjected to end-capping pretreatment and is subjected to end-capping treatment by using the transparent adhesive tape, and data of the adhesive force between the ceramic membrane element and the colloid after casting are given, namely comparative example 1 and comparative example 2.

Comparative example 1

The comparative example is an alumina ceramic membrane module of a ceramic membrane manufacturer, sealing treatment is not carried out before casting, epoxy resin is used as a binder, a ceramic membrane element and an outer structural member are centrifugally cast and bonded together, cutting is carried out after curing, most of longitudinal channels of ceramic membranes at two ends are blocked, the effective filtration porosity of the membrane element is 25%, the number of casting defect holes is 0, and the ceramic membrane element and colloid shear strength test is carried out after casting is finished: the maximum force Fm can reach 1910.5N/mm.

Comparative example 2

The comparative example is an alumina ceramic membrane module of a certain ceramic membrane manufacturer, the end sealing treatment is carried out by using a transparent adhesive tape before casting, the operation time is 2 hours, epoxy resin is used as a binder, the ceramic membrane module and an external structural member are centrifugally cast and bonded together, cutting is carried out after curing, longitudinal channels of ceramic membranes at two ends are basically not blocked, the filtration effective porosity of the membrane module is 98%, the number of casting defect holes is 12, and the ceramic membrane module and the colloid shear strength are tested after casting is finished: the maximum force Fm can reach 1920.0N/mm.

Examples 1 to 3

(1) Inserting the end part of a ceramic membrane element (an alumina ceramic membrane element of a ceramic membrane manufacturer) into a liquid hot melt adhesive with the temperature of 100-250 ℃ for end capping treatment for 0.1h, taking out the end part to contact with air at normal temperature, and naturally cooling for 0.2h until the hot melt adhesive is solidified to obtain the ceramic membrane element after end capping; the hot melt adhesive has a melt viscosity of 5500cps at 170 ℃;

(2) centrifugally casting the end part of the ceramic membrane element and an outer structural member together by using epoxy resin as a bonding agent;

(3) and after the adhesive is solidified, heating until the hot melt adhesive is in a liquid state, and liquefying the hot melt adhesive and then flowing away, namely finishing casting.

Examples 4 to 8

(1) Inserting the end part of a ceramic membrane element (an alumina ceramic membrane element of a ceramic membrane manufacturer) into a liquid hot melt adhesive with the temperature of 170 ℃ for sealing for 0.1h, taking out the end part to contact with air at normal temperature, and naturally cooling for 0.2h until the hot melt adhesive is solidified to obtain the ceramic membrane element with the sealed end; the hot melt adhesive has the melt viscosity of 500-25000cps at 170 ℃;

(2) centrifugally casting the end part of the ceramic membrane element and an outer structural member together by using epoxy resin as a bonding agent;

(3) and after the adhesive is solidified, heating until the hot melt adhesive is in a liquid state, and liquefying the hot melt adhesive and then flowing away, namely finishing casting.

Examples 9 to 11

(1) Inserting the end part of a ceramic membrane element (an alumina ceramic membrane element of a ceramic membrane manufacturer) into a liquid hot melt adhesive with the temperature of 170 ℃ for sealing for 0.001-0.5h, taking out the end part to contact with air at normal temperature, and naturally cooling for 0.2h until the hot melt adhesive is solidified to obtain the ceramic membrane element with the sealed end; the hot melt adhesive has a melt viscosity of 5500cps at 170 ℃;

(2) centrifugally casting the end part of the ceramic membrane element and an outer structural member together by using epoxy resin as a bonding agent;

(3) and after the adhesive is solidified, heating until the hot melt adhesive is in a liquid state, and liquefying the hot melt adhesive and then flowing away, namely finishing casting.

Examples 12 to 14

(1) Inserting the end part of a ceramic membrane element (an alumina ceramic membrane element of a ceramic membrane manufacturer) into a liquid hot melt adhesive with the temperature of 170 ℃ for sealing for 0.1h, taking out the end part to contact with air at normal temperature, and naturally cooling for 0.01-0.3h until the hot melt adhesive is solidified to obtain the ceramic membrane element with the sealed end; the hot melt adhesive has a melt viscosity of 5500cps at 170 ℃;

(2) centrifugally casting the end part of the ceramic membrane element and an outer structural member together by using epoxy resin as a bonding agent;

(3) and after the adhesive is solidified, heating until the hot melt adhesive is in a liquid state, and liquefying the hot melt adhesive and then flowing away, namely finishing casting.

The above description is only for the preferred embodiment of the present invention, and therefore, all the equivalent changes and modifications made in the patent scope and the specification of the present invention, which can limit the scope of the present invention, should also fall within the scope of the present invention.