JP6787743B2 - Manufacturing method of resin sash - Google Patents

Description

The present invention relates to a method for producing a resin sash using polyvinyl chloride.

Polyvinyl chloride is widely used as a resin sash for holding window glass because it has excellent mechanical strength, weather resistance, and heat insulating properties. Since polyvinyl chloride is white, it is possible to make the resin sash various colors, for example, by coloring it with a pigment. Therefore, by using polyvinyl chloride, it is possible to manufacture a resin sash having a wide variety of colors and high designability.

Resin sashes are typically manufactured by cutting and joining deformed extrusion molded polyvinyl chloride. Therefore, when the resin sash is manufactured, the cut scraps of the resin sash are generated. By recycling such scraps of the resin sash to manufacture a new resin sash, it is possible to save resources and reduce the cost.

However, such scraps of the resin sash contain various sub-ingredients depending on the specifications of the resin sash. For example, the scraps of a resin sash may be colored with a pigment or coated with a protective film. When the scraps of such a resin sash are recycled as they are, it is difficult to adjust the color and the weather resistance may be lowered due to the presence of auxiliary components.

Patent Document 1 discloses a technique for producing a new resin sash by recycling scraps generated during the production of the resin sash. In the technique according to Patent Document 1, recycled powder obtained from scraps of a resin sash and unused polyvinyl chloride powder (virgin powder) are used in combination. More specifically, the outer layer of the resin sash is formed of virgin powder, and the inner layer of the resin sash is formed of recycled powder.

In the resin sash according to Patent Document 1, by forming the outer layer appearing in the appearance with virgin powder, designability and weather resistance comparable to those of the resin sash manufactured without using recycled powder can be obtained.

Japanese Patent No. 3420527

In addition, polyvinyl chloride is widely used for applications such as resin pipes and rain gutters, and a large amount of used polyvinyl chloride is wasted due to deterioration and damage due to use. Therefore, if such used polyvinyl chloride such as a resin pipe can be recycled as a resin sash, more efficient resource saving and cost reduction will be realized.

However, although the resin sash and the used polyvinyl chloride such as a resin pipe are common in that they contain polyvinyl chloride as a main component, the required physical properties and extrusion moldability are different. For example, a resin sash is required to have high mechanical strength, whereas a resin pipe is required to have a certain degree of rigidity. Further, since the resin sash has a more complicated shape than the resin pipe, the resin sash is required to have higher extrusion moldability than the resin pipe.

Further, in the use of injection-molded products such as joints, polyvinyl chloride having a degree of polymerization of about 700 is used because it is required to cope with the complexity of the shape. Further, in rain gutter applications, polyvinyl chloride having a high heat resistant temperature and a degree of polymerization of about 1300 is used because it is used at a high temperature.
As described above, the degree of polymerization of polyvinyl chloride used differs greatly depending on the application.

Therefore, if such used polyvinyl chloride is to be recycled as it is as a resin sash, the physical properties required for the resin sash may not be obtained, and a resin sash having a desired shape may not be obtained.

In view of the above circumstances, an object of the present invention is to provide a technique for using polyvinyl chloride powder having various degrees of polymerization in a resin sash.

In order to achieve the above object, in the method for producing a resin sash according to one embodiment of the present invention, a polyvinyl chloride powder containing 60% by mass or more of polyvinyl chloride having a degree of polymerization of 1000 and an additive are mixed. A kneaded product is produced.
The kneaded product is extruded.
In this configuration, by using a polyvinyl chloride powder containing 60% by mass or more of polyvinyl chloride having a degree of polymerization of 1000, it is easy to obtain appropriate fluidity during extrusion molding, and the resin sash can be molded well. Is possible.
Further, by adding an additive to the polyvinyl chloride powder, it is possible to adjust the component to be suitable for the resin sash.

The polyvinyl chloride powder may contain at least one of a polyvinyl chloride having a degree of polymerization of 700 and a polyvinyl chloride having a degree of polymerization of 1300.
The polyvinyl chloride powder may contain recycled powder obtained by crushing a used polyvinyl chloride resin.
The used polyvinyl chloride resin may be a used resin pipe.

Among the above-mentioned polyvinyl chloride powders, the amount of polyvinyl chloride powder containing a tin-based stabilizer may be 10% by mass or less.
The polyvinyl chloride powder may not contain a tin stabilizer.
In this configuration, by limiting the amount of the tin-based stabilizer contained in the polyvinyl chloride powder, it is possible to suppress the softening and blackening of the resin sash caused by the tin-based stabilizer.

As the additive, at least one of a strengthening agent, a processing aid, and a lubricant may be used.
By using a reinforcing agent as an additive, the mechanical strength of the resin sash can be improved. By using a processing aid or lubricant as an additive, it is possible to improve the extrusion moldability of the resin sash.

It is possible to provide a technique for using polyvinyl chloride powder having various degrees of polymerization in a resin sash. Further, it is possible to provide a technique for recycling used polyvinyl chloride as a resin sash for various purposes such as a resin pipe.

It is a top view of the window which concerns on one Embodiment of this invention. It is a partial cross-sectional view along the AA'line of FIG. 1 of the window. It is an enlarged sectional view of the frame material of the resin sash of the said window. It is a flowchart which shows the recycling method of the said resin sash.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Structure of resin sash 10]
FIG. 1 is a plan view of the resin sash 10 according to the embodiment of the present invention. The resin sash 10 is configured as an outer frame of the rectangular window 1 and holds the outer edge portion of the window glass 40. The resin sash 10 has a frame material 20 and a cover material 30 containing polyvinyl chloride as a main component.

The frame material 20 has members 20a, 20b, 20c, 20d formed by deformed extrusion molding. The members 20a and 20b form long side members facing each other, and the members 20c and 20d form short side members facing each other. The members 20a, 20b, 20c, and 20d are joined to each other by welding to form a rectangular shape.

The cover material 30 has members 30a, 30b, 30c, 30d formed by deformed extrusion molding. The members 30a and 30b form long-sided members facing each other, and the members 30c and 30d form short-sided members facing each other. The members 30a, 30b, 30c, and 30d are joined to each other by fitting to form a rectangular shape.

The method of joining the members 20a, 20b, 20c, 20d of the frame material 20 and the method of joining the members 30a, 30b, 30c, 30d of the cover material 30 are not limited to welding and fitting, and known methods can be appropriately adopted. Is.

FIG. 2 is a partial cross-sectional view of the window 1 along the line AA'of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of the frame material 20 of the resin sash 10. The frame material 20 and the cover material 30 of the resin sash 10 are formed in a hollow structure and sandwich the outer edge portion of the window glass 40.

The window glass 40 has two pieces of glass 41a and 41b facing each other and a spacer 41 that secretly seals the outer edges of the glass 41a and 41b. The window glass 40 is configured as a double glazing in which argon gas is sealed in the space between the glasses 41a and 41b. The window glass 40 having such a structure can exhibit high heat insulating properties.

The configuration of the window glass 40 is arbitrary. For example, the gas sealed in the window glass 40 does not have to be argon gas, and may be, for example, krypton gas, dry air, or the like. Further, the window glass 40 does not have to be double glazing, and may be triple glass, single plate glass, or the like. Further, the glasses 41a and 41b can be arbitrarily selected from known glasses, and may be configured by being surface-coated.

As shown in FIG. 3, the frame material 20 is substantially perpendicular to the holding surface 22 that holds the end surface of the window glass 40, the first fitting portion 21 provided adjacent to the holding surface 22, and the holding surface 22. It has a first holding portion 23 that extends. The first fitting portion 21 and the first holding portion 23 are arranged on opposite sides of each other with the holding surface 22 interposed therebetween.

As shown in FIG. 2, the cover material 30 has a second fitting portion 31 and a second holding portion 32. The second fitting portion 31 is configured to be fitable to the first fitting portion 21 of the frame material 20. That is, the cover material 30 is attached to the frame material 20 by fitting the second fitting portion 31 to the first fitting portion 21. The second holding portion 32 of the cover material 30 attached to the frame material 20 extends from the second fitting portion 31 so as to face the first holding portion 23 of the frame material 20.

That is, the resin sash 10 to which the cover material 30 is attached to the frame material 20 forms a recess for receiving the outer edge portion of the window glass 40 by the holding surface 22 and the fitting portions 21 and 31. A glass pedestal 50 and airtight materials 51a and 51b are provided in the recess. The glass cradle 50 and the airtight materials 51a and 51b are made of a resin material.

The glass cradle 50 holds the end face of the window glass 40. The airtight material 51a is sandwiched between the second sandwiching portion 32 of the cover material 30 and the glass 41a of the window glass 40. The airtight material 51b is sandwiched between the first sandwiching portion 23 of the frame material 20 and the glass 41b of the window glass 40. The glass cradle 50 and the airtight materials 51a and 51b improve the airtightness between the window glass 40 and the resin sash 10 and eliminate rattling.

Further, the frame material 20 is provided with fixing portions 24, 25 protruding from the outer edge portion thereof. The protruding directions of the fixed portions 24 and 25 are orthogonal to each other, the fixed portion 24 protrudes in the outer peripheral direction, and the fixed portion 25 protrudes in the indoor direction. The fixing portions 24 and 25 are fixed to openings formed in the walls and roofs of buildings by fixing members such as screws, for example. That is, when the window 1 is installed at the opening of the building, the fixing portions 24 and 25 are fixed at the opening of the building.

[Formulation of polyvinyl chloride powder]
The frame material 20 and the cover material 30 of the resin sash 10 are manufactured by appropriately mixing polyvinyl chloride powder and additives to prepare a kneaded product, and then extruding the kneaded product into a deformed shape. The present invention is characterized in that, as the polyvinyl chloride powder, a polyvinyl chloride powder blended so as to contain at least 60% by mass or more of polyvinyl chloride having a degree of polymerization of 1000 is used.

As the polyvinyl chloride powder of the present invention, powders having various degrees of polymerization can be adopted as other polyvinyl chloride powders as long as the polyvinyl chloride having a degree of polymerization of 1000 is contained at least 60% by mass or more. Is. Examples of the polyvinyl chloride powder having a degree of polymerization other than 1000 include polyvinyl chloride powder having a degree of polymerization of 700 and 1300, and any of these polyvinyl chloride powders can be preferably used. It is also possible to blend a plurality of polyvinyl chloride powders having different degrees of polymerization.

Further, among the polyvinyl chloride powders, it is preferable that the polyvinyl chloride powder containing a tin-based stabilizer is 10% by mass or less. This makes it possible to suppress softening and blackening of the resin sash caused by the tin-based stabilizer.

Table 1 is data showing the melting characteristics when polyvinyl chloride powder having a degree of polymerization of 700, 1000, and 1300 is mixed at various ratios. From these melting characteristics, it is possible to determine whether the compounded polyvinyl chloride powder can be extruded.

These melting characteristics include maximum torque, steady torque, gelling time, and final temperature.
Here, the maximum torque means the maximum kneading torque at the start of melting, and affects the load during screw rotation during extrusion molding.
Steady torque means the kneading torque after melting and affects the load during screw rotation during extrusion molding.
The gelling time means the time required to reach the maximum torque and affects the gelling zone during extrusion molding.
The final temperature means the temperature reached by the molten resin and affects the temperature of the molten resin during extrusion molding.

As is clear from the results in Table 1, the amount of the polyvinyl chloride powder having a degree of polymerization of 700 increases, the final temperature does not rise, and molding with an extruder tends to be difficult. In addition, the gelation time tends to be short, and a sufficient viscosity as a kneaded product tends not to be obtained.

On the other hand, when the content of polyvinyl chloride powder having a degree of polymerization of 1300 increases, the viscosity of the kneaded product tends to increase, and the maximum torque and steady-state torque tend to increase, which tends to make extrusion with an extruder difficult. .. In addition, the final temperature tends to rise too much, making molding with an extruder difficult.

Therefore, it is important that the polyvinyl chloride powder having a degree of polymerization of 1000 is contained at least 60% by mass or more. In particular, from the viewpoint of handleability in extrusion molding, the content ratio of the polyvinyl chloride powder having a degree of polymerization of 1000 is preferably adjusted in the range of 80 to 100% by mass, and particularly preferably in the range of 90 to 100% by mass.

The average particle size of the polyvinyl chloride powder is preferably 3 mm or less.
Since the surface area of the polyvinyl chloride powder is larger as the average particle size is smaller, the additive easily penetrates into the polyvinyl chloride powder when the polyvinyl chloride powder and the additive are mixed. As a result, a uniform kneaded product can be obtained.

In particular, the average particle size of the polyvinyl chloride powder is 1 mm or less from the viewpoint of impact resistance in the molded product obtained by extrusion molding and from the viewpoint of obtaining a uniform kneaded product when mixed with additives. It is preferable, and more preferably 0.5 mm or less.

[Additive formulation]
Next, the additive is added to the polyvinyl chloride powder. As the additive, a plurality of types may be used in combination as needed.

As the additive, for example, a strengthening agent, a heat stabilizer, an ultraviolet stabilizer, an internal lubricant, an external lubricant, a torque improver, a colorant, a plasticizer, a filler, a processing aid, titanium oxide, calcium carbonate, etc. can be selected. Is. The type and amount of the additive added to the recycled powder can be determined from the type and amount of the components required for the frame material 20 that are not contained in the resin pipe.

In particular, by using a reinforcing agent as an additive, a frame material 20 having high mechanical strength can be obtained. Further, by using a processing aid or a lubricant as an additive, the extrusion moldability can be improved, and the frame material 20 having a complicated shape can be extruded.

The internal lubricant has a polar group and is compatible with polyvinyl chloride to reduce the kneading torque. The external lubricant is a hydrocarbon chain that is incompatible with polyvinyl chloride, and improves the slipperiness of the polyvinyl chloride and the mold.

The internal lubricant and the external lubricant can be selected from, for example, the LOXIOL (registered trademark) series of Emery Oleo Chemical Co., Ltd. As the internal lubricant, for example, G60, G32 and the like can be selected. As the external lubricant, for example, VPN963, VPN233, G21 and the like can be selected.

In addition, the heat stabilizer can prevent dehydrochlorination during the thermal decomposition of polyvinyl chloride and improve the stability due to heat. The heat stabilizer is preferably at least one of a lead-based stabilizer and a calcium / zinc-based stabilizer. Specific examples of the lead-based stabilizer include dibasic lead phosphite, tribasic lead phosphite, and lead stearate. Specific examples of the calcium / zinc-based stabilizer include fatty acid salts such as calcium stearate and zinc stearate, flossfite-based compounds as auxiliary stabilizers, hydrotalcite, and polyols.

A tin-based stabilizer is not preferable because it softens polyvinyl chloride and reacts with lead to blacken it.

Further, the type and amount of the additive to be added to the polyvinyl chloride powder may be determined based on the evaluation of the polyvinyl chloride powder and the evaluation result. As a result, it is possible to more reliably grasp the problems in manufacturing the frame material 20 by using the polyvinyl chloride powder as it is. The evaluation method of the polyvinyl chloride powder is not limited to a specific method.

For example, a molded product can be produced by using the polyvinyl chloride powder as it is. By measuring the physical properties of the molded product, it is possible to grasp the physical properties that are insufficient when the frame material 20 is manufactured using the polyvinyl chloride powder as it is. A molded product of polyvinyl chloride powder can be produced, for example, by roll kneading and press molding.

An effective method for measuring the physical properties of a molded product is illustrated below.
-Charpy impact test-Vicat softening temperature-Pyrolysis time measurement-Tensile yield stress measurement-Bending modulus measurement These measurements can be performed in accordance with, for example, JIS A5558, a shape member for fittings made of non-plastic polyvinyl chloride.

[Use of recycled powder]
As the polyvinyl chloride powder, recycled powder obtained by crushing used polyvinyl chloride used for various purposes can be used.

For example, used resin pipes can be mentioned as used polyvinyl chloride. Polyvinyl chloride having a degree of polymerization of 1000 is mainly used for the resin pipe, and the recycled powder obtained by crushing the resin pipe can be used as the polyvinyl chloride powder to be blended in the present invention.

In addition, polyvinyl chloride with a degree of polymerization of 700 is used for injection molded products such as joints, and polyvinyl chloride powder with a degree of polymerization of 1300 is used for high heat resistance applications such as rain gutters. These used polyvinyl chlorides are crushed. It is also possible to use the recycled powder thus obtained. Hereinafter, as an example, a method of recycling a resin pipe as a resin sash will be described in detail.

[Recycling method for resin pipes]
FIG. 4 is a flowchart showing a method of recycling the resin pipe as the resin sash 10. Hereinafter, a method of recycling the resin pipe as the resin sash 10 will be described with reference to FIG.

In this embodiment, an example in which the frame material 20 of the resin sash 10 is manufactured by recycling the resin pipe will be described. The cover material 30 of the resin sash 10 can also be manufactured in the same manner as the frame material 20.

(Step S10: Recovery of resin pipe)
In step S10, the resin pipe containing polyvinyl chloride as a main component is recovered. The resin pipe collected in step S10 is not limited to a specific type.

Examples of such resin pipes include hard polyvinyl chloride pipes (VP, VM, VU, etc.), impact-resistant hard polyvinyl chloride pipes (HIVP), hard polyvinyl chloride pipes for drainage in construction (IDVP), and buried pipes. Examples thereof include a rigid polyvinyl chloride pipe (ISVP) for drainage sewage, a rigid polyvinyl chloride pipe (IWVP) for water transportation, and the like.

Further, in step S10, a portion containing polyvinyl chloride as a main component may be taken out from the resin pipe in which polyvinyl chloride is partially used. Examples of resin pipes in which polyvinyl chloride is partially used include recycled hard polyvinyl chloride three-layer pipes (RS-VU) and recycled hard vinyl chloride pipes for sewerage (RS-VU). ..

The polyvinyl chloride contained in the resin pipe recovered in step S10 preferably has a degree of polymerization of 1000. In a resin pipe containing polyvinyl chloride having a degree of polymerization of 1000 as a main component, appropriate fluidity can be easily obtained when molding as the frame material 20, and the frame material 20 can be molded satisfactorily.

Further, since the tin-based stabilizer softens polyvinyl chloride and reacts with lead to blacken, the resin pipe recovered in step S10 does not contain the resin pipe containing the tin-based stabilizer. Is preferable.
When collecting a plurality of types of resin pipes, a resin pipe containing a tin-based stabilizer may be used within a range that does not adversely affect the frame material 20. In this case, the amount of the resin pipe containing the tin-based stabilizer is preferably 10% by mass or less with respect to the entire resin pipe to be recovered.

If necessary, the following treatment may be performed on the resin pipe in order to reduce impurities other than polyvinyl chloride in the recovered resin pipe.
・ Primary cutting and selection of good parts ・ Secondary cutting to remove parts with a lot of dirt such as edges ・ Removal of deposits such as soft polyvinyl chloride, tape, rust ・ Wipe with a waste cloth, high pressure cleaning , Removal of dirt by air blow, etc. ・ Detection and removal of metal parts by metal detector

As a result, the recovery of the resin pipe, which is a recycled raw material containing polyvinyl chloride as a main component, is completed.

(Step S20: Crushing of resin pipe)
In step S20, recycled powder is produced by crushing the resin pipe recovered in step S10. For step S20, for example, a twin-screw crusher, a high-speed vortex crusher, or the like can be used.

In step S20, if the resin pipe before crushing is large or long, crushing by a crusher becomes difficult. In this case, the resin pipe is cut in advance to a predetermined size or less. For example, the resin pipe is first sliced into round slices and then cut into smaller pieces.

The resin pipe can be crushed in two steps. For example, in the first stage, the resin pipe is coarsely pulverized to obtain a coarsely pulverized powder having a particle size capable of passing through a 10 to 15 mm mesh, and in the second stage, the coarsely pulverized powder is finely pulverized to obtain particles that can pass through a 5 mm mesh. It can be a finely pulverized powder having a diameter. By performing such two-step crushing, it is possible to surely produce a powder having an average particle size of 3 mm or less, which is preferable.

The average particle size of the recycled powder is preferably 3 mm or less.
Since the surface area of the recycled powder becomes larger as the average particle size becomes smaller, the additive easily permeates the recycled powder when the recycled powder and the additive are mixed in step S40 described later. As a result, a uniform kneaded product can be obtained.

On the other hand, if the average particle size of the recycled powder is larger than 3 mm, the additives are likely to be unevenly distributed in the kneaded product, which makes stable production difficult and the dimensional accuracy of the molded product obtained by extrusion molding in step S50 described later. Tends to decrease. Further, if the average particle size of the recycled powder is larger than 3 mm, gelation does not easily proceed during extrusion molding, and the frame material 20 which is an extrusion molding tends to have an uneven shape, making it difficult to obtain a smooth surface. is there.

The particle size of the recycled powder can be measured by a low-tap automatic sieve using a JIS Z8801 standard sieve.

(Step S30: Additive formulation)
In step S30, an additive is added to the obtained recycled powder. In step S30, an additive effective for overcoming the problem in producing the frame material 20 by using the recycled powder as it is is added to the recycled powder. As the additive, a plurality of types may be used in combination as needed.

As the additive, for example, a strengthening agent, a heat stabilizer, an ultraviolet stabilizer, an internal lubricant, an external lubricant, a torque improver, a colorant, a plasticizer, a filler, a processing aid, titanium oxide, calcium carbonate, etc. can be selected. Is. The type and amount of the additive added to the recycled powder can be determined from the type and amount of the components required for the frame material 20 that are not contained in the resin pipe.

In particular, by using a reinforcing agent as an additive, the flexibility derived from the resin pipe can be overcome, and the frame material 20 having high mechanical strength can be obtained. Further, by using a processing aid or a lubricant as an additive, it is possible to overcome the low extrusion moldability derived from the resin pipe, and it is possible to extrude the frame material 20 having a complicated shape.

The internal lubricant has a polar group and is compatible with polyvinyl chloride to reduce the kneading torque. The external lubricant is a hydrocarbon chain that is incompatible with polyvinyl chloride, and improves the slipperiness of the polyvinyl chloride and the mold.

The internal lubricant and the external lubricant can be selected from, for example, the LOXIOL® series of Emery Oleo Chemicals. As the internal lubricant, for example, G60, G32 and the like can be selected. As the external lubricant, for example, VPN963, VPN233, G21 and the like can be selected.

Further, the type and amount of the additive to be added to the recycled powder may be determined based on the evaluation result of the evaluation of the recycled powder. As a result, it is possible to more reliably grasp the problems in the case of manufacturing the frame material 20 by using the recycled powder as it is. The evaluation method of recycled powder is not limited to a specific method.

For example, in step S30, a molded product can be produced by using the recycled powder obtained in step S20 as it is. By measuring the physical properties of the molded product, it is possible to grasp the physical properties that are insufficient when the frame material 20 is manufactured by using the recycled powder as it is. A molded product of recycled powder can be produced, for example, by roll kneading and press molding.

An example of a method for measuring physical properties of a molded product effective in step S30 is described below.
-Charpy impact test-Pyrolysis time measurement-Tensile yield stress measurement-Bending modulus measurement These measurements can be performed in accordance with, for example, JIS A5558, a shape member for fittings made of non-plastic polyvinyl chloride.

For example, if the impact resistance of the molded product of the recycled powder is insufficient by the Charpy impact test, a reinforcing agent can be used as an additive. As the strengthening agent, for example, an acrylic strengthening agent can be used.

As described above, by blending the reinforcing agent, a frame material having excellent impact resistance and high mechanical strength can be obtained. However, if too much strengthening agent is added, not only the effect of improving mechanical strength will reach a plateau, but also the strengthening agent itself is expensive, which leads to high manufacturing cost of the frame material, so that the cost can be reduced by using recycled raw materials. The effect is reduced. From such a viewpoint, the blending ratio of the strengthening agent per 100 parts by mass of the recycled powder is preferably 10 parts by mass or less, and more preferably 7 parts by mass or less.

Further, when the thermal stability of the molded product of the recycled powder is insufficient by the thermal decomposition time measurement, a thermal stabilizer can be used as an additive. The heat stabilizer is preferably at least one of a lead-based stabilizer and a calcium / zinc-based stabilizer. Specific examples of the lead-based stabilizer include dibasic lead phosphite, tribasic lead phosphite, and lead stearate. Specific examples of the calcium / zinc-based stabilizer include fatty acid salts such as calcium stearate and zinc stearate, flossfite-based compounds as auxiliary stabilizers, hydrotalcites, polyols and the like. A tin-based stabilizer is not preferable because it softens polyvinyl chloride and reacts with lead to blacken it.

Further, in step S30, by evaluating the gelling property of the recycled powder, it is possible to grasp the physical properties that are insufficient for kneading the recycled powder in step S50 described later. The gelling property can be evaluated using, for example, a plastograph.

A torque improver can be added as an additive to adjust the gelation time and the initial gelation torque. As the torque improver, for example, polyethylene oxide wax having an acid value of 15 or more and 18 or less can be used. Examples of such an oxidized polyethylene wax include LOXIOL (registered trademark) VPG1631 (product name of Emery Oleo Chemical Co., Ltd.).

If the gelation time becomes shorter than the first range due to the addition of a torque improver, or if the initial gelation torque becomes higher than the second range, a lubricant is further added as an additive. By adding, the gelling properties can be adjusted. As the lubricant, it can be arbitrarily selected, and for example, LOXIOL (registered trademark) G60 and LOXIOL (registered trademark) G32 (both are product names of Emery Oleo Chemical Co., Ltd.) can be used.

The amount of each additive added can be appropriately determined. As an example, with respect to 100 parts by mass of recycled powder, the amount of strengthening agent added is 5 parts by mass or less, the amount of heat stabilizer added is 4 parts by mass or less, the amount of lubricant added is 2 parts by mass or less, and the torque improver. The amount of the processing aid added can be 1 part by mass or less, and the amount of the processing aid added can be 2 parts by mass or less.

Further, if necessary, an unused polyvinyl chloride powder (virgin powder) can be used as an additive. By using virgin powder as an additive, the physical properties of the frame material 20 can be easily improved. However, from the viewpoint of resource saving and cost reduction, the amount of the virgin powder added is preferably 30% by mass or less based on the total amount of the polyvinyl chloride powder composed of the recycled powder and the virgin powder.

(Step S40: Mixing of recycled powder and additive)
In step S40, the recycled powder obtained in step S20 and the additive compounded in step S30 are mixed to prepare a kneaded product. The mixing of the recycled powder and the additive can be carried out, for example, by hot blending at 100 to 140 ° C.

(Step S50: Extrusion molding)
In step S50, the members 20a, 20b, 20c, 20d of the frame material 20 are produced by deform-extruding the kneaded product obtained in step S40. Specifically, the members having the cross-sectional shape shown in FIG. 3 are continuously extruded and cut into each member 20a, 20b, 20c, 20d.

For extrusion molding of the kneaded product, for example, a 60 mmφ conical twin-screw extruder can be used. In this case, the temperature of the cylinder can be 170 to 210 ° C, the temperature of the adapter can be 180 to 200 ° C, and the temperature of the mold can be 185 to 205 ° C. The resin melting temperature at the mold outlet is preferably about 195 to 205 ° C.

After that, the frame material 20 is completed by welding the members 20a, 20b, 20c, and 20d obtained in step S50.

[Other Embodiments]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made.

For example, in the resin pipe recycling method according to the above embodiment, not only the resin sash 10 according to the above embodiment but also a resin sash having a wide variety of configurations can be newly manufactured.

Further, the resin sash manufactured by recycling the resin pipe is a composite of a recycled composition formed by using recycled powder and a virgin composition formed by using only virgin powder without using recycled powder. It may be configured. Such a resin sash can be molded by co-extruding the recycled composition and the virgin composition separately.

As an example, in the hollow structure resin sash 10, the inner layer can be a recycled composition and the outer layer can be a virgin composition. That is, by using the virgin composition for the outer layer appearing in the appearance of the resin sash 10, the appearance equivalent to that in the case where the recycled composition is not used can be obtained. On the other hand, by using a recycled composition for the inner layer that does not affect the design of the resin sash 10, it is possible to save resources and reduce costs. In addition, recycled powder can be added to the virgin composition within a range that does not affect the color tone.

Further, if necessary, a coating layer may be provided on the surface of the resin sash obtained in the above embodiment. For example, the surface of the resin sash may be provided with a resin film or coating, or a metal cover such as aluminum. Further, the resin sash may be painted with various paints or the like.

Hereinafter, in order to explain the present invention, examples will be given, but the present invention is not limited to these examples.

[Example 1]
The following recycled powders were prepared as vinyl chloride powders having each degree of polymerization.
Coarse crushed powder of vinyl chloride pipe joint with a degree of polymerization of 700 Coarse crushed powder of resin sash with a degree of polymerization of 1000 Crude crushed powder of vinyl chloride pipe with a degree of polymerization of 1300

Each recovered vinyl chloride powder was finely pulverized by a rotary pulverizer to obtain a vinyl chloride powder having an average particle size of 0.2 mm. Then, it was mixed in the following compounding ratio.
Degree of polymerization 1000: 80 parts by mass Polymerization degree 1300: 20 parts by mass

Using the obtained vinyl chloride powder, a kneaded product was prepared at the following blending ratio.
Vinyl chloride powder: 100 parts by mass Reinforcement agent: Acrylic reinforcement 3 parts by mass External lubricant: Polyethylene oxide wax 0.2 parts by mass

The obtained kneaded product was extruded by extrusion molding with a conical twin-screw extruder at a cylinder temperature of 175 to 195 ° C. and a die temperature of 190 to 200 ° C. to prepare a molded product. The molded body was cut out to the size of the window frame. The non-defective product acquisition rate of the cut-out window frame was 95%, and the moldability evaluation in extrusion molding was 1.

The molded product extruded by extrusion molding was cut out to the size of the window frame, and was evaluated on the following three grades based on the non-defective income rate of the window frame.
I: Good product acquisition rate of 90% or more II: Good product rate of less than 90% III: Extrusion molding not possible

Further, a test piece having a length of 1 cm, a width of 8 cm, and a thickness of 2.5 cm was prepared from the above-mentioned molded product, and a Charpy impact test was conducted based on JIS A5558. As a result, 20 KJ / m ² at 23 ° C and 8 KJ / m at -10 ° C. ^{It was 2} , and a molded product satisfying the standard was obtained.

[Examples 2 to 4, Comparative Example 1]
A molded product was prepared in the same manner as in Example 1 except that the vinyl chloride powder was blended in the proportion shown in Table 2. Table 2 shows the formability during extrusion molding and the results of the Charpy impact test.

As shown in Table 2, in each of Examples 1 to 4, good moldability was obtained and high Charpy impact strength was obtained. Further, in Examples 1 to 3 in which the compounding ratio of the vinyl chloride powder having a degree of polymerization of 1000 was 80% by mass, particularly good moldability was obtained. On the other hand, in Comparative Example 1 in which the compounding ratio of the vinyl chloride powder having a degree of polymerization of 1000 was less than 60% by mass, extrusion molding could not be performed.

1 ... Window 10 ... Frame material 20 ... Cover material 30 ... Window glass 50 ... Glass cradle 51a, 51b ... Airtight material 100 ... Resin sash

Claims (6)

A kneaded product was prepared by mixing a polyvinyl chloride powder containing 60% by mass or more of polyvinyl chloride having a degree of polymerization of 1000 and further containing polyvinyl chloride having a degree of polymerization of 1300 and an additive.
A method for producing a resin sash that extrudes the kneaded product. The method for manufacturing a resin sash according to claim 1 .
A method for producing a resin sash, which comprises a recycled powder obtained by crushing a used polyvinyl chloride resin by the polyvinyl chloride powder. The method for manufacturing a resin sash according to claim 2 .
A method for manufacturing a resin sash in which the used polyvinyl chloride resin is a used resin pipe. The method for producing a resin sash according to any one of claims 1 to 3 .
A method for producing a resin sash in which 10% by mass or less of the polyvinyl chloride powder containing a tin-based stabilizer is contained in the polyvinyl chloride powder. The method for manufacturing a resin sash according to claim 4 .
A method for producing a resin sash in which the polyvinyl chloride powder does not contain a tin-based stabilizer. The method for producing a resin sash according to any one of claims 1 to 5 .
A method for producing a resin sash, which uses at least one of a strengthening agent, a processing aid, and a lubricant as the additive.

Images