JPH08267448A - Detecting method for kneaded state of resin mixture and manufacture of the mixture - Google Patents

Abstract

PURPOSE: To detect the kneaded state of resin mixture during kneading by directly measuring the fluorescent spectrum at the rear end of an extruder, and comparing it with previously stored data by an evaluating unit. CONSTITUTION: The exciting light from a light source 7 is incident on melted kneaded resin via a transparent unit engaged with a die 6 via a light emitting fiber 4. Thus, fluorescence of fluorescent chromophoric group in the excited resin is sent to a spectrometer 8. A fluorescent detector 20 is provided at the rear end of an extruder to immediately and continuously measure the kneaded state of the resin at the extruder end. The signal of the fluorescent spectrum measured by the spectrometer 8 is sent to an evaluating unit 9. The evaluating data such as the fluorescent spectra of previously measured various resin and compatibilizing agent are stored in the unit 9, and the kneaded state of the resin can be detected by comparing with the measured result and calculating it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a melt-kneaded state of a resin mixture and a method for producing a resin-melted mixture.

[0002]

2. Description of the Related Art As a conventional method for detecting a melt-kneaded state of a resin mixture, there is Japanese Patent Publication No. 2-l648. This device is equipped with a control unit and a control unit for controlling the feed amount of the raw material resin to the screw extruder, and the control unit and control unit are connected to the spectrometer through the evaluation device, and the color density of the finished compound is determined. Is detected by a spectrometer through a light transmission sensor, and the evaluation device compares the detected value of the spectrometer with the target value of the color density of the standard compound to detect the melt-kneaded state of the resin mixture. Then, based on the above result, the supply of the base resin component, the dye, the additive and the like to the metering hopper of the screw extruder is adjusted by driving the control means and the adjusting unit.

Further, Japanese Patent Laid-Open No. 6-3275 discloses a method of observing an image obtained by a light source attached to a kneading machine and an image pickup camera with an image sensor to determine the kneading state of the molten resin. There is.

[0004]

However, in the conventional method for detecting the melt-kneaded state of the resin mixture, since the judgment is made from the color and turbidity of the melt-kneaded resin, it is possible to detect the fine melt-kneaded state. It was not possible, and it was impossible to say that kneading was performed while controlling the kneading state of the resin during melt kneading.

An object of the present invention is to provide a method for detecting the melt-kneading state during kneading of a resin mixture.

Another object of the present invention is to provide a method for producing a resin mixture using the above.

[0007]

The gist of the present invention for achieving the above object is as follows.

[1] In a method for detecting a kneaded state of a resin mixture in which a resin mixture composed of two or more kinds of resins is melt-kneaded by a kneading extruder, at least one resin molecule of the mixed resin components is melted and kneaded. Are bound to each other by a fluorescent chromophore that causes a spectrum shift in the fluorescence spectrum when interacting with each other, and the spectrum shift of the fluorescence spectrum is continuously measured at the rear end of the kneading extruder and A method for detecting the melt-kneaded state of a resin mixture, which detects the melt-kneaded state of the resin mixture by continuously detecting the dispersed state of the fluorescent chromophore.

[2] The resin mixture as described above, wherein the binding ratio of the fluorescent chromophore is 0.1 to 1 in the ratio of the monomer units to which the fluorescent chromophore is bonded to the total monomer units of the resin. Method for detecting melt-kneading state of.

[3] A compatibilizing agent in which the resin mixture contains at least one compatibilizing agent and the compatibilizing agent does not include the fluorescent chromophore, or a fluorescent chromophore bound to a resin A method for detecting the melt-kneaded state of the above resin mixture using compatibilizers containing different types of fluorescent chromophores.

[4] The dispersion state of the fluorescent chromophore is
Intensity (Ie) of shifted fluorescence spectrum after melt-kneading
And the intensity (Im) of the fluorescence spectrum before melt-kneading (Ie / Im) are taken, and the melt-kneading of the resin mixture is controlled so that the supply amount of the resin mixture and the compatibilizer is controlled so that this value becomes the smallest. State detection method.

[5] In a method for producing a resin melt mixture in which a resin mixture composed of two or more kinds of resins is melt-kneaded by a kneading extruder, the resin molecules of at least one component of the mixed resin components come close to each other by the melt-kneading. Then, a fluorescent chromophore that causes a spectral shift in the fluorescent spectrum by interaction is bound, and the spectral shift of the fluorescent spectrum is continuously measured at the rear end of the kneading extruder to obtain the fluorescent chromophore in the molten resin. A method for producing a resin melt mixture in which the melt-kneaded state of the resin mixture is continuously detected from the dispersed state and melt-kneaded.

[6] A measuring means for continuously measuring the spectral shift of the fluorescent chromophore at the rear end of the kneading extruder is a light source for injecting light into the melt-kneading resin, and the light is emitted from the melt-kneading resin. Having a fluorescence detection unit for detecting the fluorescence spectrum, inputting the intensity of the fluorescence spectrum shift detected by the fluorescence detection unit to the spectrum analyzer, and ideal melting of the target resin mixture stored in advance in the spectrum analyzer. The fluorescence spectrum shift intensity in the kneading state is compared and calculated, and if it is different, a control signal is issued, and the raw material resin supply unit, the compatibilizer supply unit, the screw rotation drive unit of the kneading extruder, and the heating temperature are calculated. A method for producing a resin melt mixture in which the resin mixture is continuously melt-kneaded while changing the kneading conditions by controlling.

In the present invention, it is necessary that at least one of the resin components to be kneaded contains a fluorescent chromophore.
Further, when two or more kinds of resins or compatibilizers containing a fluorescent chromophore are used, each fluorescent chromophore is different.

At least one of the above fluorescent chromophores is
It must give a shift in its fluorescence spectrum by interacting with the fluorescent chromophore in the ground state in the electronically excited state. For these fluorescent chromophores,
Examples thereof include benzene, naphthalene, anthracene, pyrene, carbazole and biphenyl.

The resin which can contain the above-mentioned fluorescent chromophore includes polystyrene (PS), acrylonitrile-styrene copolymer (AS), acrylonitrile-butadiene-styrene copolymer (ABS), styrene-butadiene. Styrene copolymers such as block copolymer (SBS), hydrogenated styrene-butadiene block copolymer (SEBS), polyethylene terephthalate (PE
T), polyesters using terephthalic acid such as polybutylene terephthalate (PBT) and its derivatives as raw materials,
Polyester using naphthyl dicarboxylic acid such as polyethylene naphthalate (PEN) and its derivative as a raw material,
Polyphenylene ether (PPE), bisphenol A
Polycarbonates made from bisphenols such as polycarbonate (PC), polyvinylnaphthalene and copolymers thereof, polyvinylcarbazole (PVCz)
And its copolymer, polyvinylpyrene and its copolymer, polyphenylmethacrylate and its copolymer, poly-1-naphthylmethylmethacrylate and its copolymer, poly-2-naphthylmethylmethacrylate and its copolymer, poly Examples thereof include carbazolyl ethyl methacrylate and its copolymer, polycarbazolyl ethyl acrylate and its copolymer, and the like.

The content of the fluorescent chromophore in the above resin is in the range of 0.1 to 1 in terms of the ratio of the monomer unit to which the fluorescent chromophore is bonded to all the monomer units of the resin. Is preferred.

Any compatibilizer may be used as long as it satisfies the condition that it does not contain the same fluorescent chromophore as the resin, such as styrene-methyl methacrylate graft or block copolymer, styrene-ethylene graft or block. Copolymer, ethylene-propylene rubber, ethylene-vinyl acetate copolymer, ethylene-propylene-diene block copolymer (EPDM), styrene-butadiene block copolymer (SBS), hydrogenated styrene-butadiene block copolymer Combined (SEBS), Maleized EPD
M, maleated SBS, maleated SEBS, maleated polyethylene, maleated polypropylene, maleated polystyrene, various polymers such as ethylene-glycidyl methacrylate copolymer, 2,5-dimethyl-2,5-di-t-butylperoxy Organic low molecular weight compounds such as peroxides such as hexane, isocyanates such as diphenylmethane-4,4-diisocyanate, oxazolines such as bisoxazoline, and diurethanes such as diphenylmethane-4,4-diisopropylurethane can be used.

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing an example of the kneading extruder of the present invention. The extruder 19 includes a screw 3 that rotates in a cylinder 2 by a driving device 1 and a resin supply hopper 1.
1, 12 and a compatibilizer supply hopper 13 are connected to each other, and a fluorescence detection unit 20 is provided at the rear end of the cylinder 2, to which a light source 7 and a spectrometer 8 are connected. An evaluation device 9 is connected to the spectrometer 8, and a control device 10 is connected to the evaluation device 9. The control device 10 is connected so as to control the resin supply valves 15 and 16, the compatibilizer supply valve 17, and the heater 5, respectively. There is.

The resin supply valves 15 and 16 are the resin supply hopper 1.
The amount of resin supplied from 1 and 12 to the hopper 18 is
The compatibilizer supply valve 17 adjusts the amount of the compatibilizer supplied from the compatibilizer supply hopper 13 to the hopper 18.

The raw material resin and the compatibilizer once supplied to the hopper 18 are supplied into the cylinder 2, melted by heating, kneaded by the screw 3, and extruded from the rear end of the cylinder 2.

FIG. 2 is a schematic sectional view of the fluorescence detecting portion 20 provided at the rear end of the cylinder 2. The transparent body 2 in which the excitation light from the light source 7 is fitted into the die 6 by the light projecting fiber 4.
The fluorescence of the fluorescent chromophore in the resin, which is incident on the melt-kneaded resin through 1 and is excited by this, is received by the light-receiving fiber 1
4 to the spectrometer 8 of FIG.

As the light source 7, a xenon lamp, a mercury lamp, various lasers, etc. can be used, and a spectroscope, an interference filter, a colored glass filter, a solution filter, etc. are used to excite each fluorescent chromophore. The light of the required wavelength can be obtained.

The detection of the fluorescence spectrum in the present invention is carried out by
By providing the fluorescence detector 20 as shown in FIG. 2 at the rear end of the extruder, the kneaded state of the melt-kneaded resin at the end of the extruder can be measured immediately and continuously. That is, a light having a wavelength that excites the fluorescent chromophore is incident on the melt-kneading resin containing the fluorescent chromophore from the light source 7, and the desired kneading state is determined based on the observation result of the fluorescence spectrum of the fluorescent chromophore. As obtained, the opening degrees of the resin supply valves 15 and 16 and the compatibilizer supply valve 17 are controlled to adjust the supply amounts of both. Further, a desired kneading state can be obtained by adjusting the rotation speed of the screw of the kneading extruder and the kneading temperature.

To automate the above, the signal of the fluorescence spectrum measured by the spectrometer 8 is evaluated by the evaluation device 9.
Send to The evaluation device 9 stores evaluation data such as various resins and fluorescence spectra of compatibilizers that have been measured in advance, and the kneaded state of the resin can be detected by comparing and calculating the measurement results. it can.

When the kneading state is not desirable as a result of the comparison and calculation of the evaluation device 9, a control signal is output to the control device 10, and based on this, the resin supply amount, the compatibilizing agent supply amount,
The rotation speed of the screw and the kneading temperature are controlled. In addition, the control device 10 can be set in advance with a width for changing or controlling the supply amount of the resin and the compatibilizer, the rotation speed of the screw, the kneading temperature, and the like. Can be changed automatically or arbitrarily.

The method for finding the optimum kneading conditions for the resin mixture having a known combination has been described above. However, for a resin mixture having an unknown combination, the appropriate kneading conditions can be immediately known in the same manner, and the kneading conditions can be set. By doing so, a resin mixture having a good melt-kneaded state can be obtained.

Further, even when the characteristics are not constant due to the inclusion or deterioration of impurities, for example, when a recycled resin material is used as the raw material, the optimum kneading conditions can be found in the same manner, so that a molten resin mixture having stable characteristics can be obtained. It can be manufactured continuously.

[0030]

The above-mentioned fluorescent chromophore, for example, benzene, usually gives a fluorescence spectrum having a sharp peak around 280 nm, but when benzene rings are close to each other in polystyrene, benzene in the excited state and the ground in the vicinity thereof are excited. The benzene in the state forms an exciplex called an excimer by the interaction.

This excimer gives a broad peak near a wavelength of 330 nm and gives a spectrum shifted to the long wavelength side as compared with the case where there is no interaction. The average distance between the benzene rings of polystyrene is about 1.8 nm. In the excimer, the benzene rings are about 0.4 in parallel.
It is said that it is formed when approaching nm.

In polystyrene, the benzene rings have a random arrangement, and depending on the arrangement, some form excimers and some do not. Therefore, the observed spectrum gives a spectrum in which a normal spectrum (emission in a state called a monomer for an excimer) and a spectrum of an excimer are mixed. In the case of polystyrene, the emission intensity ratio (Ie / Im) of the excimer (Ie) and the monomer (Im) is about 1.7 when compared in the wavelength portion of the peak.

When this polystyrene is mixed with a compatible resin, if both are mixed at the molecular chain level, the polystyrene chains are in a so-called diluted state, the benzene rings in the polystyrene chains move away from each other, and The proportion of the benzene rings having the arrangement becomes small, the emission intensity of the excimer becomes relatively weak, and Ie / Im becomes small.

On the other hand, when polystyrene and a resin incompatible with each other are mixed, the resin undergoes phase separation to form domains composed of the respective resins. In this case, the distance between the benzene rings in the polystyrene domain does not change from that of the polystyrene resin, and Ie / Im does not change. Therefore, by measuring Ie / Im, it is possible to know the mixed state at the molecular chain level when polystyrene and another resin are mixed.

Further, even in a resin containing naphthalene as a fluorescent chromophore, for example, poly-1-naphthylmethylmethacrylate or a copolymer thereof, a naphthalene monomer Im having a peak at a wavelength of 330 nm and a naphthalene having a peak at a wavelength of 390 nm are used. By measuring the ratio of the excimer Ie, the kneaded state of the resin can be known from the dispersed state of the fluorescent chromophore. This is similar to polystyrene containing the fluorescent chromophore described above.

Therefore, the optimum kneading state can be obtained by adjusting the Ie / Im value to the minimum.

[0037]

【Example】

[Embodiment 1] Next, an embodiment of the present invention will be shown and specifically described.

Twin-screw kneading extruder (MP-201, manufactured by Tubaco Corporation)
Two resin supply hoppers and one compatibilizer supply hopper are attached to the hopper 18 of the (type 5), and the fluorescence detection unit 20 is provided at the rear end of the cylinder 2, and the light source 7 is connected to this with the optical fiber. Further, the fluorescence detection unit 20 was connected to the spectrometer 8 via an optical fiber. In addition, as the spectrometer 8, a fluorescence spectrophotometer (Hitachi F-4500
Type) was used.

A personal computer was connected to the spectrometer 8 as a control device 10 for controlling the spectrum analysis, the resin supply amount, the compatibilizer supply amount, the rotation speed of the extruder screw, and the kneading temperature.

Nylon 6 resin (PA6) was used as a resin mixture for kneading, and PET which was recovered after once used was used. Benzene is bonded to PET as a fluorescent chromophore.

To observe the kneaded state, 3 of the fluorescence spectrum was used.
The ratio Ie / Im of the emission intensity (Ie) of 30 nm and the emission intensity (Im) of 280 nm was used. The Ie / Im of PET alone is 1.3, and the smaller the value, the better the resin kneading.

The mixture was fed so that PET / PA6 = 80/20 (weight ratio), melt kneading was carried out at a kneading temperature of 280 ° C. and a screw rotation speed of 150 rpm. In addition, Ie / Im was observed, adjusting the addition amount (weight%) of the compatibilizer bisoxazoline with respect to the resin mixture.

The resin melt-kneaded by the above-mentioned extruder was sampled every 10 minutes, and the pelletized product was injection-molded to prepare a test piece.
It measured based on ISK7110. Table 1 shows the measurement results.

[0044]

[Table 1]

Comparative Example 1 Using the twin-screw kneading extruder of Example 1 (however, a spectrometer and the like are not connected), 280 ° C., screw rotation speed 150 rpm, PET /
PA6 = 80: 20, the compatibilizer bisoxazoline was added at 2%, and the mixture was melt-kneaded. Similarly to Example 1, the resin after melt-kneading was sampled every 10 minutes to prepare a test piece,
The notched IZOD impact strength of this was measured. The measurement results are also shown in Table 1.

Comparative Example 2 Melt-kneading was carried out under the same conditions as in Comparative Example 1 except that the addition amount of bisoxazoline was 4%, and the notched IZOD impact strength of this was measured. The measurement results are also shown in Table 1.

Comparative Example 3 Melt kneading was carried out under the same conditions as in Comparative Example 1 except that the amount of bisoxazoline added was 6%, and the notched IZOD impact strength of the mixture was measured. The measurement results are also shown in Table 1.

As can be seen from the results in Table 1, in Comparative Examples 1 to 3 in which the amount of the compatibilizing agent was constant, the IZOD impact strength varied greatly. In Comparative Examples 1 and 2, Ie / Im cannot be maintained at 1 or less. In Comparative Example 3, Ie / Im was able to be 1 or less, but the amount of the compatibilizer added was 6%.
And many.

In contrast to these comparative examples, in Example 1, Ie / Im was kept at 1 or less while adjusting the amount of the compatibilizer,
It can be seen that the IZOD impact strength can be set to 40 to 46 kgf · cm / cm ^2, and the variation range is small.
The amount of the compatibilizer added is 2%, and Ie / Im can be 1 or less.

Example 2 Polyvinylphenol (PV
Ph), polybutylmethacrylate (PBMA), and 1-naphthylmethylmethacrylate-butylmethacrylate copolymer (PB) containing naphthalene as a fluorescent chromophore.
MA-N7) was used and melt-kneading was performed using the twin-screw kneading extruder of Example 1.

In this case, PBMA-N7 has a ratio of the monomer units to which the fluorescent chromophore is bonded to the total monomer units of 0.07.

PVPh / PBMA / PBMA-N7 = 8
It was set to 0/17/3, the screw rotation speed was set to 150 rpm, the kneading temperature was gradually increased starting from 100 ° C., and the temperature at which the resin was best kneaded was determined. The quality of the kneaded state was determined from the ratio Ie / Im of the emission intensity (Ie) at 380 nm and the emission intensity (Im) at 330 nm of the fluorescence spectrum measured by the spectrometer 8.

Ie / Im of PBMA-N7 alone
Is 0.05, the smaller the Ie / Im is less than 0.05, the better the resin is kneaded. The domain size of the melt-kneaded resin sequentially sampled at the rear end of the extruder was observed using a transmission electron microscope. The results are shown in Table 2.

[0054]

[Table 2]

[Example 3] Instead of PBMA-N7 of Example 2, PBMA-N in which the ratio of the monomer units in which the fluorescent chromophore is bonded to all the monomer units is 0.15.
Using No. 15, kneading was performed in the same manner as in Example 2. This PB
Since the Ie / Im of the fluorescence spectrum of MA-N15 alone is 0.1, the smaller the value, the better the kneading of the resins. Table 2 shows the results.

The time required from the start of the kneading work until the optimum kneading temperature was determined was measured. The results are shown in Table 3.
Shown in

[0057]

[Table 3]

Comparative Example 4 Using the twin-screw kneading extruder of Example 1 (however, the spectrometer 8 is not connected), the screw rotation speed is 150 rpm, PVPh / PBMA /
Resin of PBMA-N7 = 80/17/3 was melt-kneaded. After the extruder, the kneaded resin was sequentially collected at the terminal, and the fluorescence spectrum of this was measured with a spectrometer to measure 380n.
m emission intensity (Ie) and 330 nm emission intensity (Im)
The ratio Ie / Im of was calculated.

The kneading temperature is 5 ° C starting from 200 ° C.
The kneaded resin was sampled each time the temperature decreased, and Ie / Im was measured. The time required from the start of the kneading work until the optimum kneading temperature was determined was measured. The results are shown in Table 3.

As can be seen from Table 2, in Example 2 in which PBMA-N7 in which the ratio of the monomer unit having the fluorescent chromophore bonded to all the monomer units was 0.07 was kneaded, Ie / Im was measured. By keeping 0 at 0, a melt-kneaded resin having a domain size of 0.1 μm or less can be obtained. Further, in Example 3 in which PBMA-N15 in which the ratio of the monomer units in which the fluorescent chromophore is bonded to all the monomer units was 0.15 was kneaded, Ie / Im was set to 0.1. The domain size can be controlled to be 0.05 μm or less.

As can be seen from Table 3, it is necessary to determine the optimum kneading temperature of the resin after kneading, as compared with Comparative Example 4 in which the fluorescence temperature spectrum was separately measured by a spectrometer to determine the kneading temperature range. The time is 1 / th in the third embodiment.
4 can be done. Further, the kneading temperature range can be determined more precisely.

[0062]

According to the present invention, by measuring the fluorescence spectrum directly at the rear end of the extruder and comparing it with the data stored in advance in the evaluation device 9, the fine kneading state of the resin can be continuously maintained. Can be detected.

Further, since the kneading state of the resin can be immediately detected, the desired kneading state can be obtained by automatically controlling the amount of the resin supplied, the amount of the compatibilizing agent, the screw rotation speed of the kneading extruder and the kneading temperature based on the computer. The molten resin mixture can be continuously obtained.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a kneading extruder of the present invention.

FIG. 2 is an enlarged schematic cross-sectional view of a fluorescence detection unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Driving device, 2 ... Cylinder, 3 ... Screw, 4 ... Projection fiber, 5 ... Heater, 6 ... Die, 7 ... Light source, 8 ...
Spectrometer, 9 ... Evaluation device, 10 ... Control device, 1
1, 12 ... Resin supply hopper, 13 ... Compatibilizer supply hopper, 14 ... Light receiving fiber, 15, 16 ... Resin supply valve,
17 ... Compatibilizer supply valve, 18 ... Hopper, 19 ... Extruder,
20 ... Fluorescence detection part, 21 ... Transparent body.

Claims (7)

[Claims] 1. A method for detecting a kneaded state of a resin mixture, which comprises melt-kneading a resin mixture comprising two or more resins with a kneading extruder, wherein at least one resin molecule of the mixed resin component is A fluorescent chromophore that causes a spectrum shift in the fluorescence spectrum due to interaction when they are close to each other is bound, and the spectrum shift of the fluorescence spectrum is continuously measured at the rear end of the kneading extruder to measure the fluorescence in the molten resin. A method for detecting the melt-kneaded state of a resin mixture, which comprises detecting the melt-kneaded state of the resin mixture by continuously detecting the dispersed state of the chromophore. 2. The binding rate of the fluorescent chromophore, which causes a spectrum shift in the fluorescence spectrum due to the interaction when they approach each other, is the ratio of the monomer units to which the fluorescent chromophore is bound to the total monomer units of the resin. The method for detecting the melt-kneaded state of the resin mixture according to claim 1, wherein the value is 0.1 to 1. 3. The resin mixture comprises one or more compatibilizers, wherein the compatibilizer does not include the fluorescent chromophore, or is different from a fluorescent chromophore bound to a resin. A compatibilizer comprising a fluorescent chromophore of one type is used.
The method for detecting the melt-kneaded state of the resin mixture according to [4]. 4. The ratio (Ie) of the dispersion state of the fluorescent chromophore to the intensity (Ie) of the shifted fluorescence spectrum after melt-kneading and the intensity (Im) of the fluorescence spectrum before melt-kneading.
/ Im), and the method of detecting the melt-kneaded state of the resin mixture according to claim 3, wherein the supply amounts of the resin mixture and the compatibilizer are controlled so as to minimize this value. 5. A method for producing a resin melt mixture in which a resin mixture composed of two or more resins is melt-kneaded by a kneading extruder, wherein at least one resin molecule of the mixed resin component comprises:
When resin molecules approach each other by melt-kneading, a fluorescent chromophore that causes a spectrum shift in the fluorescence spectrum by interaction is combined, and the spectrum shift of the fluorescence spectrum is continuously measured and melted at the rear end of the kneading extruder. A method for producing a resin melt mixture, which comprises continuously detecting the melt-kneading state of the resin mixture from the dispersion state of the fluorescent chromophore in the resin and performing melt-kneading. 6. A measuring means for continuously measuring the spectrum shift of the fluorescent chromophore, which causes a spectrum shift in the fluorescence spectrum due to the interaction when they approach each other, at the rear end of the kneading extruder, a measuring means for measuring the light in the molten kneading resin. Having a light source for entering and a fluorescence detection unit for detecting a fluorescence spectrum emitted from the melt-kneaded resin, inputting the intensity of the fluorescence spectrum shift detected by the fluorescence detection unit to the spectrum analysis device, and to the spectrum analysis device. Comparing the intensity of the fluorescence spectrum shift in the ideal melt-kneading state of the target resin mixture stored in advance, issuing a control signal if it is different, the raw material resin supply unit, the compatibilizer supply unit, The resin mixture is continuously melted and mixed while changing the kneading conditions by controlling the screw rotation drive section of the kneading extruder and the heating temperature. The method for producing the resin melt mixture according to claim 5, wherein the resin melt mixture is kneaded. 7. The kneading extruder is provided with two or more raw material resin supplying sections and one or more compatibilizing agent supplying sections, and control for controlling the supply amounts thereof by a control signal from the spectrum analyzer. The method for producing a resin melt mixture according to claim 6, further comprising a valve.