CN112642669A - Method for spraying release agent - Google Patents
Method for spraying release agent Download PDFInfo
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- CN112642669A CN112642669A CN202010284265.4A CN202010284265A CN112642669A CN 112642669 A CN112642669 A CN 112642669A CN 202010284265 A CN202010284265 A CN 202010284265A CN 112642669 A CN112642669 A CN 112642669A
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- Prior art keywords
- release agent
- atomized
- mold
- spraying
- jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/58—Applying the releasing agents
Abstract
The embodiment of the application provides a method for spraying a release agent. The method comprises the following steps: respectively atomizing a plurality of release agents, and enabling each release agent to respectively form an atomized jet flow; all atomized jets were sprayed onto the mold surface. Spraying all the atomized jets on the surface of the mold comprises spraying all the atomized jets on the surface of the mold after intersecting and mixing, or spraying all the atomized jets on the surface of the mold in sequence. Compared with the prior art, the method is suitable for the demolding process under the combined action of multiple demolding agents, and the multiple demolding agents, particularly the multiple demolding agents capable of generating synergistic effect, can be atomized respectively and form atomized jet flows respectively and then are mixed and sprayed on the surface of the mold, so that the demolding effect of the product is improved effectively; the solvent-based release agent and the water-based release agent which can generate synergistic effect can be atomized respectively and form atomized jet flows respectively, and then the atomized jet flows are mixed and sprayed on the surface of the mold, so that the discharge of VOC can be effectively reduced while the good demolding effect is ensured.
Description
Technical Field
The invention relates to the technical field of release agents, in particular to a method for spraying a release agent.
Background
In order to prevent the formed article from sticking to the mold, it is often necessary to release the article from the mold using a release agent during the demolding process. The release agent is a functional substance interposed between the mold and the finished product, and is used on the surfaces of two objects which are easily adhered to each other to easily separate the two.
Common mold release agents include solvent-based mold release agents and water-based mold release agents. The solvent-based release agent is the most widely applied release agent and has the characteristics of easiness in release and low mold fouling; however, since the Organic solvent is mainly used as a carrier, the emission of Volatile Organic Compounds (VOC) is generated during the use process, which is very unfavorable for environmental protection. Water-based release agents, while not emitting VOCs, have poor release performance and are difficult to obtain with flawless surfaces.
Disclosure of Invention
The embodiment of the invention aims to overcome the defects of the prior art and provide a method for spraying a release agent.
The method for spraying the release agent provided by the embodiment of the invention comprises the following steps: respectively atomizing a plurality of release agents, and enabling each release agent to respectively form an atomized jet flow; all atomized jets were sprayed onto the mold surface.
Optionally, spraying all of the atomized jets onto the mold surface comprises: all the atomized jets are mixed and sprayed on the surface of the mould.
Optionally, the angle between the centre line of at least one atomising jet and the centre line of an adjacent atomising jet is in the range of greater than 0 ° to less than or equal to 90 °.
Optionally, the angle between the centre line of at least one atomising jet and the centre line of an adjacent atomising jet is 75 °.
Optionally, the central angle of the fan surface of the spray formed by the intersection and mixing of all the atomized sprays is in the range of greater than or equal to 60 ° to less than or equal to 120 °.
Optionally, the central angle of the fan surface of the spray formed by the intersection and mixing of all the atomized sprays is 90 °.
Optionally, the atomizing flow rate of the at least one atomizing jet is in the range of greater than 0 grams/second to less than or equal to 3 grams/second.
Optionally, the at least one atomizing jet has an atomizing flow rate of 0.8 grams/second.
Optionally, the atomization pressure of at least one atomization jet is in the range of greater than or equal to 0.2MPa to less than or equal to 0.5 MPa.
Optionally, the atomization pressure of at least one atomization jet is 0.5 MPa.
Alternatively, multiple release agents may produce a synergistic effect with each other.
Alternatively, the plurality of mold release agents comprises a two-part semi-permanent mold release agent.
Alternatively, one component of the two-component semi-permanent mold release agent comprises a polysiloxane compound having a silicon-hydrogen bond or an emulsion thereof, and the other component comprises an organosilicon compound containing a silicon hydroxyl group or capable of being hydrolyzed to generate a silicon hydroxyl group, a crosslinking catalyst; or one component comprises a polysiloxane compound having a plurality of silicon-hydrogen bonds or an emulsion thereof, and the other component comprises a compound containing at least two vinyl groups, a hydrosilylation catalyst; or one of the components comprises a polymer having a plurality of epoxy groups or an emulsion thereof and the other component comprises a compound having at least two amino groups.
Optionally, the plurality of mold release agents includes at least one solvent-based mold release agent.
Optionally, the plurality of release agents includes at least one water-based release agent.
Optionally, spraying all of the atomized jets onto the mold surface comprises: and spraying all the atomized jets on the surface of the mold in sequence.
Optionally, the plurality of mold release agents includes a water-based mold release agent and a solvent-based mold release agent; and water-based atomized spray formed by the water-based release agent and solvent-based atomized spray formed by the solvent-based release agent are sequentially sprayed on the surface of the mold.
Alternatively, the solvent-based release agent comprises a dispersion system with isoparaffin as a carrier and wax and/or silicone as main active components.
Optionally, the water-based release agent comprises a dispersion of water as a carrier and wax and/or silicone as the major active components.
The embodiment of the invention also provides application of the method for spraying the release agent in demolding products, wherein the products comprise polyurethane products, rubber products, EVA products or composite products.
Compared with the prior art, the technical scheme of the embodiment of the invention has the beneficial effect. For example, the technical scheme provided by the embodiment of the invention is suitable for a demolding process in which multiple demolding agents participate together, and can obtain a better demolding effect.
For example, a plurality of release agents, especially a plurality of release agents capable of generating a synergistic effect, are respectively atomized to form atomized jet flows, and then are mixed and sprayed on the surface of the mold, so that the mold release effect of the product can be effectively improved.
For example, after the solvent-based release agent and the water-based release agent are respectively atomized and form atomized jet flows respectively, the atomized jet flows are mixed and sprayed on the surface of the mold, so that not only can a good demolding effect be ensured, but also the emission of VOC can be effectively reduced.
For example, after the components of the semi-permanent release agent are respectively atomized and form atomized jet flows, the atomized jet flows are mixed and sprayed on the surface of the mold, so that the discharge of VOC can be avoided, the demolding frequency of single spraying can be increased, and the working efficiency is improved.
For another example, after the water-based release agent and the solvent-based release agent are respectively atomized and form atomized jet flows, the atomized jet flows are sequentially sprayed on the surface of the mold, so that the VOC emission can be effectively reduced, and meanwhile, the good release effect is achieved.
Drawings
FIG. 1 is a flow chart of a method of spraying a release agent in an embodiment of the present invention;
FIG. 2 is a schematic diagram of the application of the method of spraying a release agent in an embodiment of the present invention;
FIG. 3 is a schematic view showing another application of the method of spraying a mold release agent in the embodiment of the present invention, in which the mixed state of the mold release agent is not shown;
FIG. 4 is a schematic microscopic view of the demolded surfaces of the polyurethane foams in example 1, comparative example 1, and comparative example 2 of the present invention; wherein, a is a schematic microscope diagram provided by embodiment 1, b is a schematic microscope diagram provided by comparative example 1, and c is a schematic microscope diagram provided by comparative example 2;
FIG. 5 is a schematic microscopic view of the surface of the polyurethane foam after demolding in example 2 of the present invention.
Detailed Description
In the prior art, a single type of release agent is generally used to release the article. The use of solvent-based release agents can cause VOC emissions, which is very undesirable for environmental protection. If a water-based mold release agent is used, the mold release effect is poor and it is difficult to obtain a mold release article having a flawless surface.
Even if the technical scheme that a plurality of release agents are mixed in advance and then sprayed on the die is considered, various problems exist. For example, the release agents are incompatible with each other, the release agents are unstable after mixing, and the release agents may be cured in advance after mixing, which seriously affects the spraying of the release agents and the film forming properties after spraying, and further affects the release effect.
Unlike the prior art, embodiments of the present invention provide a method of spraying a release agent. The demolding method comprises the following steps: respectively atomizing a plurality of release agents, and enabling each release agent to respectively form an atomized jet flow; all atomized jets were sprayed onto the mold surface.
Further, spraying all the atomized jets onto the mold surface may include spraying all the atomized jets onto the mold surface after mixing, or spraying all the atomized jets onto the mold surface successively.
Compared with the prior art, the technical scheme provided by the embodiment of the invention is suitable for the demolding process in which multiple demolding agents participate together, and can obtain a better demolding effect.
By adopting the technical scheme provided by the embodiment of the invention, various release agents, particularly various release agents capable of generating synergistic effect, can be respectively atomized to form atomized jet flows respectively and then are mixed and sprayed on the surface of the mold, so that the demolding effect of the product is effectively improved.
By adopting the technical scheme provided by the embodiment of the invention, the solvent-based release agent and the water-based release agent can be atomized respectively, form atomized jet flows respectively and then are mixed and sprayed on the surface of the mold, so that not only can a good demolding effect be ensured, but also the emission of VOC can be effectively reduced.
By adopting the technical scheme provided by the embodiment of the invention, the components of the semi-permanent release agent can be atomized respectively, atomized jet flows are formed respectively, and then the atomized jet flows are mixed and sprayed on the surface of the mold, so that the discharge of VOC can be avoided, the release times of single spraying can be improved, and the working efficiency is improved.
By adopting the technical scheme provided by the embodiment of the invention, the water-based release agent and the solvent-based release agent can be respectively atomized to form atomized jet flows and then sequentially sprayed on the surface of the mold, so that the VOC emission can be effectively reduced and the good release effect can be realized.
In order to make the objects, features and advantages of the embodiments of the present invention more comprehensible, specific embodiments accompanied with figures are described in detail below.
FIG. 1 is a flow chart of a method of spraying a release agent in an embodiment of the present invention.
As shown in fig. 1, a method for spraying a release agent according to an embodiment of the present invention includes the following steps:
s10, atomizing the release agents respectively, and enabling each release agent to form an atomized jet flow;
s20, spraying all atomized spray streams on the surface of the mold.
The method for spraying the release agent, provided by the embodiment of the invention, is mainly suitable for the situation that a plurality of release agents participate in the same release process together, and especially for the situation that a plurality of release agents which are not suitable for being mixed in advance participate in the same release process together.
The release agents provided by the embodiment of the invention can at least comprise a solvent-based release agent, a water-based release agent, a solvent-based release agent and a water-based release agent.
The solvent-based release agent can comprise a dispersion system which takes isoparaffin as a carrier and takes wax and/or organosilicon as main active components. In some specific examples, the solvent-based release agent may be selected from
PU-61053,
PU-61054,
PU-61056,
PU-61068,
PU-61082,
One or more of PU-61116.
Water-based mold release agents may include a dispersion of water as a carrier and wax and/or silicone as the major active components. In some specific examples, the water-based mold release agent may be selected from the group consisting of CHPO-19-100W,
PU-A14202W,
PU-A14192W,
PU-A14196W,
PU-64001W,
PU-64002W,
one or more of PU-64005W.
Further, spraying all atomized jets onto the mold surface in step S20 may include:
s21, spraying all the atomized jets on the surface of the mold after mixing or
And S22, spraying all the atomized spray streams on the surface of the mold in sequence.
For step S21, in some preferred embodiments, the angle between the centerline of at least one atomizing jet and the centerline of an adjacent atomizing jet may be in the range of greater than 0 ° to less than or equal to 90 °. Further, the angle between the centre line of at least one atomising jet and the centre line of an adjacent atomising jet may be 75 °.
Therefore, atomization jet flows of various release agents can be uniformly mixed, active components of the various release agents which can generate synergistic effect can better generate synergistic effect, and the release effect is further effectively improved.
In some preferred embodiments, for step S21, the central angle of the fan of the spray formed by the intersection and mixing of all atomized sprays may be in the range of greater than or equal to 60 ° to less than or equal to 120 °. Further, the central angle of the fan surface of the spray formed by the intersection and mixing of all the atomized sprays may be 90 °.
Therefore, all atomization jet flows can be uniformly sprayed on the surface of the mold after being mixed, and the mold release agent can be more uniformly formed on the surface of the mold.
For step S21, in some preferred embodiments, the atomizing flow rate of the at least one atomizing jet can be in the range of greater than 0 g/sec to less than or equal to 3 g/sec. Further, the atomizing flow rate of the at least one atomizing jet may be 0.8 g/sec.
For step S21, in some preferred embodiments, the atomizing pressure of the at least one atomizing jet can be in the range of greater than or equal to 0.2MPa to less than or equal to 0.5 MPa. Further, the atomization pressure of at least one atomization jet may be 0.5 MPa.
For step S21, various mold release agents that produce a synergistic effect with each other are also suitable.
The synergistic effect is a chemical phenomenon, also called synergistic effect, and means that two or more than two release agents are added or blended together, and the produced release effect is larger than the sum of the release effects of the release agents when the release agents are applied independently. Therefore, in the technical scheme provided by the embodiment of the invention, a plurality of release agents capable of generating a synergistic effect are selected, so that the release effect of the product can be effectively improved, the consumption of the release agents can be reduced, and the cost can be effectively saved.
It should be noted that, in the technical solutions provided in the embodiments of the present invention, "synergistic effect may be generated" refers to enhanced performance brought by interaction between active components of various mold release agents.
For step S22, some preferred embodiments may include a water-based release agent and a solvent-based release agent. When spraying, the water-based atomized spray jet formed by the water-based release agent and the solvent-based atomized spray jet formed by the solvent-based release agent are sequentially sprayed on the surface of the mold, namely the water-based atomized spray jet is sprayed firstly, and the solvent-based atomized spray jet is sprayed later.
In some specific examples, the release agent may be sprayed by air-assisted spraying. The spraying equipment mainly adopted by the air-assisted spraying can comprise a spray gun, a storage tank and an air compressor. The storage tank is suitable for storing the release agent to be sprayed; the air compressor is suitable for providing compressed air; the spray gun is suitable for spraying the release agent in the storage tank to the surface of the mold under the action of the air compressor.
Further, the lance may comprise a feed tube. The material pipe is connected with the storage tank, the storage tank is connected with the air compressor, and the air compressor is suitable for enabling the interior of the storage tank to generate pressure and pressing the release agent into the material pipe.
Further, the spray gun also comprises a nozzle. The nozzle can be connected with the air compressor through two pipelines respectively, wherein one pipeline is a starting pipeline and is responsible for providing compressed air for starting the nozzle, and the other pipeline is an atomizing pipeline and is responsible for providing compressed air for atomization.
The spray nozzle is normally in a closed state, when spraying operation is required, the starting pipeline and the atomizing pipeline are opened, the spray nozzle is started through compressed air provided by the starting pipeline, the release agent in the material pipe is pressed out of the spray nozzle, and the compressed air provided by the atomizing pipeline atomizes the release agent pressed out of the spray nozzle and forms atomizing jet flow.
Generally, air-assisted spraying can be performed under any spraying conditions, is relatively easy to operate, and is suitable for spraying operations where the spraying quality is important.
In some specific examples, a spray gun with multiple nozzles may be employed. Each nozzle is adapted to apply a release agent in an atomized spray pattern onto the mold surface.
The spraying manner and the spraying apparatus provided in the embodiment of the present invention are only an example, and are not intended to limit the spraying manner and the spraying apparatus that can be used in the embodiment of the present invention.
The technical scheme provided by the embodiment of the invention can be widely applied to demoulding and injection molding of polyurethane products, rubber products, EVA products (ethylene-vinyl acetate copolymer and rubber and plastic foaming materials prepared from the ethylene-vinyl acetate copolymer) or composite material products and the like.
The technical solution provided by the present invention is further illustrated below by using different embodiments.
Example 1
In this embodiment, the method for spraying the release agent includes:
s10, respectively atomizing a plurality of release agents, and enabling each release agent to respectively form an atomized jet flow;
and S21, spraying and coating the atomized jet flow on the surface of the mold after the atomized jet flow is intersected and mixed.
In this example, a water-based release agent and a solvent-based release agent were selected as the release agents. Specifically, the water-based release agent can be CHPO-19-100W produced by Kentan chemical industry, and the solvent-based release agent can be CHPO-19-100W produced by Kentan chemical industry
PU-61053。
In this example, water-based mold release agent CHPO-19-100W and solvent-based mold release agent
PU-61053 was sprayed by atomization using a dual-nozzle automatic spray gun A-100. The calibers of the two nozzles are both 0.8 mm.
FIG. 2 is a schematic diagram of the application of the method of spraying a release agent in an embodiment of the present invention; fig. 3 is a schematic view showing another application of the method of spraying the mold release agent in the embodiment of the present invention, and the mixed state of the mold release agent is not shown in the figure.
As shown in FIGS. 2 and 3, the water-based mold release agent CHPO-19-100W and the solvent-based mold release agent
PU-61053 are atomized respectively and form an atomized jet flow; wherein the water-based release agent CHPO-19-100W forms a water-based atomized spray jet J1Solvent-based mold release agents
PU-61053 to form solvent-based atomized spray J2。
Referring to FIG. 3, water-based atomized spray J1Central line l of1And solvent-based atomized spray J2Central line l of2The included angle between the two is alpha; water-based atomized jet J1And solvent-based atomized spray J2The central angle of the jet flow fan surface formed after the interactive mixing is beta; water-based atomized jet J1The distance from the nozzle outlet position A to the atomized jet flow junction point O is AO; solvent-based atomized spray J2From the nozzle outlet position B to the point where the atomized jets meetThe distance of O is BO; A. the vertical distance from the connecting line AB of the two points B to the merging point O of the atomized jet flow is d1(ii) a The vertical distance from the merging point O of the atomized jets to the surface S of the mold is d2. In some specific examples, AO and BO may be the same.
Table 1 shows the spray parameters of this example, referring to Table 1, in one embodiment, the water-based mold release agent CHPO-19-100W and the solvent-based mold release agent
The amounts of PU-61053 used are in each case 50% by weight; water-based atomized jet J1And solvent-based atomized spray J2The atomization flow rate is 0.8 g/s; water-based atomized jet J1And solvent-based atomized spray J2The atomization pressure of the liquid is 0.5 MPa.
Table 1 spray parameters for example 1
In table 1, the amount of the water-based release agent and the amount of the solvent-based release agent are both in mass percent.
The technical scheme provided by the embodiment can be used for demolding the polyurethane foam, and the demolding process of the polyurethane foam is realized by adopting the conventional technical means in the field.
In this embodiment, before spraying, the mold may be heated to 60 ℃ for use; and (3) spraying a release agent by using the double-nozzle spray gun, pouring a polyurethane foaming material, closing the mold, curing for 5 minutes, and taking out the product after opening the mold.
Comparative example 1
In this comparative example, only one solvent-based release agent was selected. Specifically, the solvent-based release agent is produced by Kentan chemical industry
PU-61053, which adopts an automatic spray gun A-100 with the caliber of 0.8mm for atomization spraying.
Table 2 shows the spray parameters of the comparative examples. Reference toTABLE 2 solvent-based mold release agent in this comparative example
The amount of PU-61053 used was the sum of the amounts of the water-based mold release agent and the solvent-based mold release agent used in example 1, the atomizing flow rates of the atomized jets formed were all 0.8 g/sec, the atomizing pressure of the atomized jet formed was 0.5MPa, the atomized jet formed was sprayed perpendicularly onto the mold surface, the distance from the nozzle exit position to the mold surface was d, and the central angle of the fan surface of the jet formed by the atomized jet was β.
TABLE 2 spray parameters of comparative example 1
The technical scheme provided by the comparative example is used for demolding polyurethane foam, and the demolding process is the same as the technical means adopted in the example 1.
Comparative example 2
In this comparative example, only one water-based mold release agent was selected. Specifically, the water-based release agent can be CHPO-19-100W produced by Kentan chemical industry, and is atomized and sprayed by an automatic spray gun A-100 with the caliber of 0.8 mm.
Table 3 shows the spray parameters of the comparative examples. Referring to table 3, in this comparative example, the amount of water-based release agent CHPO-19 to 100W used was the sum of the amount of water-based release agent and the amount of solvent-based release agent used in example 1, the atomization flow rate of the atomization jet was 0.8 g/sec, the atomization pressure of the atomization jet was 0.5MPa, the atomization jet was sprayed perpendicularly to the mold surface, and the center angle of the fan surface of the jet formed by the atomization jet was β from the nozzle exit position to the mold surface.
TABLE 3 spray parameters of comparative example 2
| Atomization flow of water-based atomized spray | Atomization pressure of water-based atomized jet | β | d’ |
| 0.8 g/s | 0.5MPa | 90° | 28 cm |
The technical scheme provided by the comparative example is used for demolding polyurethane foam, and the demolding process is the same as the technical means adopted in the example 1.
The polyurethane foams used for the treatment to be demolded in example 1, comparative example 1, and comparative example 2 were the same. Specifically, the polyurethane foam may be a polyether of the model DALTOFLEX JC80220 or isocyanate SUPERASEC 7007 from hensmei.
FIG. 4 is a schematic microscopic view of the demolded surfaces of the polyurethane foams in example 1, comparative example 1, and comparative example 2 of the present invention; wherein, a is a schematic microscope diagram provided by embodiment 1, b is a schematic microscope diagram provided by comparative example 1, and c is a schematic microscope diagram provided by comparative example 2.
As shown in FIG. 4, the demolded surface of the polyurethane foam of example 1 had a semi-open cell structure, the demolded surface of the polyurethane foam of comparative example 1 had an open cell structure, and the demolded surface of the polyurethane foam of comparative example 2 had a closed cell structure.
In comparative example 1, only solvent-type release agent was used
PU-61053 as a mold release agent. SolutionDosage form mold release agent
PU-61053 is a dispersion of wax particles which form an inert particle of wax upon spraying onto the mold surface. After the polyurethane foaming material is poured, the polyurethane foaming material is blocked by the wax particles, and gas generated by foaming is smoothly discharged from gaps among loose wax particles, so that the surface of a product after demoulding presents an open pore structure.
In comparative example 2, only a water-based release agent CHPO-19-100W was used as the release agent. The main active component of the water-based release agent CHPO-19-100W is a nonpolar oil-soluble substance which needs to be dispersed in water by virtue of a surfactant with certain hydrophilicity. When the polyurethane foaming material is poured on the surface of the mold, the polyurethane foaming material can be combined with the surfactants, and a layer of compact film is formed on the surface of the mold, so that the surface of a product after demolding presents a closed cell structure.
In the technical solution provided in example 1, two release agents were used, one being a solvent-based release agent Chem-Trend and the other being a water-based release agent CHPO-19-100W. During spraying, solvent-based release agent Chem-Trend and water-based release agent CHPO-19-100W are respectively atomized and respectively form water-based atomized jet J1And solvent-based atomized spray J2Spraying the mixture on the surface of a mold after the mixture is mixed.
Example 1 provides a water-based atomized spray J1And solvent-based atomized spray J2After the two components are mixed together, a synergistic effect can be generated. The active component in the water-based release agent CHPO-19-100W has small particle radius, and the solvent-based release agent
The particle radius of the active ingredient in PU-61053 is large. When water-based atomized jet J1And solvent-based atomized spray J2After the mixture is mixed, the small-particle active component in the water-based release agent CHPO-19-100W can be filled in the gap formed by the large-particle active component in the solvent-based release agent ChemTernd PU-61053, so that the surface of the demoulded product presentsA semi-open pore structure.
Referring to fig. 4, the surface topography of the polyurethane foam of example 1 after demolding was similar to that of comparative example 1. Thus, the release effect of the release treatment for polyurethane foam after spray coating according to the technical scheme provided in example 1 was completely the same as that of the release treatment using the solvent-based release agent under the same conditions
The demoulding effect of PU-61053 is close and the demoulding effect is good.
In example 1, a solvent-based release agent and a water-based release agent were used together, and the amounts of the solvent-based release agent and the water-based release agent used were each 50% by weight, as compared with the case of comparative example 1 in which the solvent-based release agent was used entirely. Therefore, by adopting the method provided in example 1, the VOC emission can also be reduced to 50%.
Further, it was confirmed through a plurality of tests that the same excellent mold release effect was obtained even when the spray parameters of example 1 were appropriately adjusted.
In particular, the angle between the centre line of at least one atomisation jet and the centre line of an adjacent atomisation jet may be adjusted to lie in the range of more than 0 ° to less than or equal to 90 °. The central angle of the fan surface of the spray formed by the intersection and mixing of all the atomized sprays can be adjusted to be in the range of more than or equal to 60 degrees to less than or equal to 120 degrees. The atomizing flow rate of the at least one atomizing jet can be adjusted to lie in the range from greater than 0 g/sec to less than or equal to 3 g/sec. The atomization pressure of at least one atomization jet can be adjusted to lie in the range of greater than or equal to 0.2MPa to less than or equal to 0.5 MPa.
Due to the same or similar spraying mechanism and demolding mechanism, the technical scheme provided by the embodiment 1 can also be applied to other solvent-based demolding agents and water-based demolding agents, and tests prove that good demolding effect can be obtained and VOC emission can be effectively reduced. Wherein, the solvent-based release agent can be a dispersion system which takes isoparaffin as a carrier and takes wax and/or organosilicon as main active components; for example, can be
PU-61054,
PU-61056,
PU-61068,
PU-61082,
One or more of PU-61116. The water-based release agent can be a dispersion system which takes water as a carrier and takes wax and/or organosilicon as main active components; for example, can be
PU-A14202W,
PU-A14192W,
PU-A14196W,
PU-64001W,
PU-64002W,
One or more of PU-64005W.
Meanwhile, due to the same or similar demoulding mechanism, the technical scheme provided by the embodiment 1 can be widely applied to demoulding and injection moulding of rubber products, EVA products or composite material products and the like, has a good demoulding effect, and can effectively reduce VOC emission due to the introduction of the water-based demoulding agent compared with the situation of completely using a solvent-based demoulding agent, thereby being beneficial to environmental protection.
Example 2
In this embodiment, the method for spraying the release agent includes:
s10, respectively atomizing a plurality of release agents, and enabling each release agent to respectively form an atomized jet flow;
s22, spraying all the atomized jets on the surface of the mold in sequence.
In this example, a water-based release agent and a solvent-based release agent were selected as the release agents. Specifically, the water-based release agent can be CHPO-19-100W produced by Kentan chemical industry, and the solvent-based release agent can be CHPO-19-100W produced by Kentan chemical industry
PU-61053。
In this example, water-based mold release agent CHPO-19-100W and solvent-based mold release agent
U-61053 is used in amounts of 50% each in weight percent.
In this example, water-based mold release agent CHPO-19-100W and solvent-based mold release agent
PU-61053 is atomized by an automatic spray gun A-100 with the caliber of 0.8 mm.
In step 22, a water-based atomized spray of a water-based mold release agent CHPO-19-100W is sprayed, followed by a solvent-based mold release agent
PU-61053. The spray parameters of the solvent-based release agent were the same as in comparative example 1, and the spray parameters of the water-based release agent were the same as in comparative example 2.
The technical scheme provided by the embodiment is used for demolding the polyurethane foam, and the demolding process is the same as that of the embodiment 1.
FIG. 5 is a schematic microscopic view of the surface of the polyurethane foam after demolding in example 2 of the present invention.
Referring to fig. 4 and 5, the surface topography of the polyurethane foam of example 2 was close to that of comparative example 1, and the mold release effect was good.
From this, it is understood that the release effect obtained by applying the spray coating method provided in example 2 to the release treatment of the polyurethane foam is close to that obtained by completely applying the solvent-based release agent under the same conditions, and the release effect is excellent.
In example 2, a solvent-based release agent and a water-based release agent were used together, compared to comparative example 1, in which the solvent-based release agent was used entirely. Therefore, the method provided by the embodiment can effectively reduce the discharge amount of VOC.
Due to the same or similar spraying mechanism and demolding mechanism, the technical scheme provided by the embodiment 2 can also be applied to other solvent-based demolding agents and water-based demolding agents, and tests prove that good demolding effect can be obtained and VOC emission can be effectively reduced. Wherein, the solvent-based release agent can be a dispersion system which takes isoparaffin as a carrier and takes wax and/or organosilicon as main active components; for example, can be
PU-61054,
PU-61056,
PU-61068,
PU-61082,
One or more of PU-61116. The water-based release agent can be carried by water and mainly comprises wax and/or organosiliconA dispersion of an active ingredient; for example, can be
PU-A14202W,
PU-A14192W,
PU-A14196W,
PU-64001W,
PU-64002W,
One or more of PU-64005W.
Due to the same or similar demoulding mechanism, the technical scheme provided by the embodiment 2 can be widely applied to demoulding and injection moulding of rubber products, EVA products or composite material products and the like, has good demoulding effect, and can effectively reduce VOC emission due to the introduction of the water-based demoulding agent compared with the situation of completely using a solvent-based demoulding agent, thereby being beneficial to environmental protection.
Example 3
In this embodiment, the method for spraying the release agent includes:
s10, respectively atomizing a plurality of release agents, and enabling each release agent to respectively form an atomized jet flow;
and S21, spraying and coating the atomized jet flow on the surface of the mold after the atomized jet flow is intersected and mixed.
The technical scheme provided by the embodiment can be used for spraying the semi-permanent release agent. The semi-permanent mold release agent may comprise several separate prepolymers which are mixed at the time of use and subjected to sufficient cross-linking polymerization for mold release.
Commonly used semi-permanent mold release agents are generally two-part.
In some embodiments, one component, component one, may comprise a silicone compound having a silicon-hydrogen bond or an emulsion thereof, the other component, component two, may comprise an organosilicon compound containing silicon hydroxyl groups or capable of being hydrolyzed to form silicon hydroxyl groups, a crosslinking catalyst, and the other component may be either water-based or solvent-based.
In other embodiments, component one may comprise a polysiloxane compound having a plurality of silicon-hydrogen bonds or an emulsion thereof, and component two may comprise a compound containing at least two vinyl groups, a hydrosilylation catalyst; or component one may comprise a polymer having multiple epoxy groups or an emulsion thereof and component two may comprise a compound containing at least two amino groups.
The following description will be given with specific examples.
Unlike example 1, this example was sprayed with a two-part semi-permanent mold release agent. Wherein, the component one is hydrogen-containing silicone oil emulsion with solid content of 1-3%, the hydrogen mass percentage of the hydrogen-containing silicone oil is 1.8%, and the internal phase number average molecular weight is 50000; the second component is a mixed dispersion system of hydroxyl-terminated silicone oil emulsion with the solid content of 1-3 percent and organic tin catalyst emulsion with the solid content of 0.1 percent, and the number average molecular weight of the used hydroxyl-terminated silicone oil emulsion is 200000.
In this example, the semi-permanent mold release agent was sprayed by atomization using a double-nozzle automatic spray gun A-100. Wherein, one of the double nozzles is used for spraying the first component, the other one is used for spraying the second component, and the calibers of the two nozzles are both 0.8 mm.
In the embodiment, the usage amounts of the component one and the component two are respectively 50% by weight percent; the atomization flow rates of atomization jet flows formed by the component I and the component II are both 1 g/s; the atomization pressure of the atomization jet flow formed by the first component and the second component is 0.5 MPa; the included angle between the central lines of the atomized jet flows formed by the first component and the second component is 60 degrees; the central angle of the fan surface of the spray flow formed by the mutual mixing of the atomized spray flows formed by the first component and the second component is 90 degrees.
The technical scheme provided by the embodiment is used for demolding the polyurethane foam, and the demolding process is the same as that of the embodiment 1.
Comparative example 3
This comparative example differs from example 3 in that spraying was carried out using only component one. Specifically, the component I adopts hydrogen-containing silicone oil emulsion with the solid content of 1-3%, the hydrogen mass percentage content of the hydrogen-containing silicone oil is 1.8%, and the internal phase number average molecular weight is 50000.
In this comparative example, the first component was spray-coated by atomization using an automatic spray gun A-100 having a bore diameter of 0.8 mm.
In this comparative example, the amount of component one used is the sum of the amounts of the two mold release agents in example 3; the atomization flow rate of the atomization jet flow formed by the first component is 1 g/s, the atomization pressure of the atomization jet flow is 0.5MPa, the distance from the outlet position of the nozzle to the surface of the die is 28 cm, and the central angle beta of the fan surface of the atomization jet flow formed by the atomization jet flow is 90 degrees.
The technical scheme provided by the comparative example is used for demolding polyurethane foam, and the demolding process is the same as that of the example 1.
In the technical scheme provided by the embodiment of the invention, the sprayed molds in the embodiment 3 and the comparative example 3 can be respectively used for multiple demolding tests of polyurethane foam. Test results show that the mold obtained in comparative example 3 can be used for twice demolding after being sprayed once (the technical scheme provided by comparative example 3 is adopted for each spraying), and the demolding agent needs to be sprayed again after twice demolding; the mold obtained in example 3 can be used for five times of demolding after being sprayed once (the technical scheme provided in example 3 is adopted for each spraying), and the demolding effect is good each time.
Therefore, by adopting the technical scheme provided by the embodiment 3, the demoulding times of single spraying can be effectively improved, so that the demoulding work efficiency is improved.
In the technical solution provided in comparative example 3, since the one-component mold release agent (component one) cannot form a mold release agent film having a certain crosslinking density on the mold surface, it is difficult to provide multiple mold release.
In the solution provided in example 3, two crosslinkable release agents (component one and component two) are sprayed onto the mold surface and are capable of rapid crosslinking and curing to form a semi-permanent coating that can be used for multiple releases.
In addition, the two-part semi-permanent mold release agent provided in example 3 can also be sprayed by a conventional method, i.e., by mixing the first and second parts on site and then spraying. However, with this method, the life of the mixture of the component one and the component two is short, and the effect of use is reduced with the time after mixing. With the technical solution provided in embodiment 3, this problem can be solved just effectively. In the technical scheme provided by embodiment 3, the first component and the second component can be separately stored in a storage tank, and when in use, the first component and the second component are atomized respectively, form an atomized jet flow, are mixed together and sprayed on the surface of the mold, and can perform a crosslinking curing reaction after reaching the surface of the mold, and form a film with a certain crosslinking density. The film with a certain crosslinking density has good demolding effect and can be used for demolding for multiple times.
Due to the same or similar demolding mechanism, the technical scheme provided by the embodiment 3 can be widely applied to demolding and injection molding of rubber products, EVA products or composite material products and the like, has a good demolding effect, can effectively reduce VOC emission under the condition of introducing water-based components compared with the condition of completely using solvent-based demolding agents, and is beneficial to environmental protection.
While specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even where only a single embodiment is described with respect to a particular feature. The characteristic examples provided in the present disclosure are intended to be illustrative, not limiting, unless differently stated. In particular implementations, the features of one or more dependent claims may be combined with those of the independent claims as technically feasible according to the actual requirements, and the features from the respective independent claims may be combined in any appropriate manner and not merely by the specific combinations enumerated in the claims.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (20)
1. A method of spraying a release agent, comprising the steps of:
respectively atomizing a plurality of release agents, and enabling each release agent to respectively form an atomized jet flow;
all atomized jets were sprayed onto the mold surface.
2. The method of claim 1, wherein said spraying all of the atomized jets onto the mold surface comprises:
all the atomized jets are mixed and sprayed on the surface of the mould.
3. A method according to claim 2, wherein the angle between the centre line of at least one atomising jet and the centre line of an adjacent atomising jet is in the range of greater than 0 ° to less than or equal to 90 °.
4. A method according to claim 3, characterized in that the angle between the centre line of at least one atomising jet and the centre line of an adjacent atomising jet is 75 °.
5. The method of claim 2, wherein the fan of all of the atomized jets meet and mix to form a jet having a central angle in the range of from greater than or equal to 60 ° to less than or equal to 120 °.
6. A method according to claim 5, characterized in that the fan of the spray formed by the merging and mixing of all the atomising sprays has a central angle of 90 °.
7. The method of claim 2, wherein the atomizing flow rate of the at least one atomizing jet is in the range of greater than 0 grams/second to less than or equal to 3 grams/second.
8. The method of claim 7 wherein at least one of the atomizing jets has an atomizing flow rate of 0.8 grams per second.
9. A method according to claim 2, characterized in that the atomizing pressure of at least one atomizing jet lies in the range from greater than or equal to 0.2MPa to less than or equal to 0.5 MPa.
10. A method according to claim 9, characterized in that the atomizing pressure of at least one atomizing jet is 0.5 MPa.
11. The method of claim 2, wherein the plurality of release agents are synergistic with each other.
12. The method of claim 2, wherein the plurality of release agents comprises a two-part semi-permanent release agent.
13. The method according to claim 12, wherein one of the two-component semi-permanent mold release agent comprises a polysiloxane compound having a silicon-hydrogen bond or an emulsion thereof, and the other component comprises an organosilicon compound containing a silicon hydroxyl group or capable of being hydrolyzed to a silicon hydroxyl group, a crosslinking catalyst; or one component comprises a polysiloxane compound having a plurality of silicon-hydrogen bonds or an emulsion thereof, and the other component comprises a compound containing at least two vinyl groups, a hydrosilylation catalyst; or one of the components comprises a polymer having a plurality of epoxy groups or an emulsion thereof and the other component comprises a compound having at least two amino groups.
14. The method of claim 2, wherein the plurality of mold release agents includes at least one solvent-based mold release agent.
15. The method of claim 2, wherein the plurality of mold release agents includes at least one water-based mold release agent.
16. The method of claim 1, wherein said spraying all of the atomized jets onto the mold surface comprises:
and spraying all the atomized jets on the surface of the mold in sequence.
17. The method of claim 16, wherein the plurality of mold release agents includes a water-based mold release agent and a solvent-based mold release agent; and the water-based atomized spray formed by the water-based release agent and the solvent-based atomized spray formed by the solvent-based release agent are sequentially sprayed on the surface of the mold.
18. The method according to claim 14 or 17, wherein the solvent-based release agent comprises a dispersion system with isoparaffin as carrier and wax and/or silicone as main active components.
19. The method according to claim 15 or 17, wherein the water-based release agent comprises a dispersion of water as a carrier and wax and/or silicone as the main active components.
20. Use of a method of spraying a release agent as claimed in any one of claims 1 to 19 in the release of an article, including a polyurethane article, a rubber article, an EVA article or a composite article.
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| US6117495A (en) * | 1993-09-01 | 2000-09-12 | Polymerit | Method for forming a mold-release coating |
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| CN205042651U (en) * | 2015-09-04 | 2016-02-24 | 苏州优尼昂精密金属制造有限公司 | Mold releasing agent spraying device |
| US20160264818A1 (en) * | 2015-03-10 | 2016-09-15 | Peterson Chemical Technology Llc | Low delamination mold release |
| CN106553296A (en) * | 2016-10-28 | 2017-04-05 | 宝美施化工(上海)有限公司 | For the aqueous release agent from skinning type polyurethane foam material |
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|---|---|---|---|---|
| US3931381A (en) * | 1970-09-04 | 1976-01-06 | The General Tire & Rubber Company | Mold release method for polyurethane integral-skin foam |
| US4602060A (en) * | 1983-04-25 | 1986-07-22 | Frekote, Inc. | Two-component mold release system and method |
| US4770827A (en) * | 1985-01-17 | 1988-09-13 | Teroson Gmbh | Process for producing molded articles |
| US6117495A (en) * | 1993-09-01 | 2000-09-12 | Polymerit | Method for forming a mold-release coating |
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