CN102476431A

CN102476431A - Method for improving dispersibility of ABS color masterbatches in large-scale injection molding

Info

Publication number: CN102476431A
Application number: CN2010105646318A
Authority: CN
Inventors: 付常俊; 高茜
Original assignee: Hefei Genius New Materials Co Ltd
Current assignee: Hefei Genius New Materials Co Ltd
Priority date: 2010-11-29
Filing date: 2010-11-29
Publication date: 2012-05-30

Abstract

The invention, belonging to the field of high-molecular material injection molding, relates to a method for improving the dispersibility of ABS color masterbatches, comprising the following steps: first, mixing the ABS color masterbatches with ABS resin in a required proportion in a high speed mixer for several minutes; then injecting the mixture in a feed inlet of an injection machine; and finally, arranging a forced mixing unit on a screw head of the injection machine, fully mixing the ABS resin with the color masterbatches by intensive mixing in the forced mixing unit to achieve the effect that colourment is uniformly dispersed in the resin matrix. The method is simple to operate, and solves the problem that color masterbatches are nonuniformly dispersed in large-scale injection molding.

Description

A kind of method of improving ABS Masterbatch dispersiveness in large-scale injection molding

Technical field

The invention belongs to macromolecular material injection mo(u)lding field, relate to the dispersed method of a kind of ABS of improvement Masterbatch.

Background technology

ABS resin is a kind of thermoplastic of function admirable, has high impulse strength, hear resistance and dimensional stability, is widely used in electric equipment products, automobile, building and daily necessities.Be color and the mechanical strength that makes goods, the painted general use special color master batch of ABS resin.

And ABS resin is formed by the copolymerization of block acrylonitrile-butadiene-styrene (ABS), the at high temperature molten height that refers to of its Masterbatch, and mobile poor, toner is difficult for mixing.At present, the most dependence on import of domestic high-grade ABS Masterbatch.But; Even dispersed than more excellent Masterbatch, at the bigger product of injection moulding, particularly product weight is when 0.5kg is above; It is inhomogeneous to be prone to that form and aspect take place; The phenomenon that the toner decentralization is not enough, wherein particularly outstanding with white product, the aberration Δ E between same product different parts even up to 0.5.

Summary of the invention

The object of the present invention is to provide a kind of simple method, it is dispersed to be used for large-scale injection mo(u)lding product ABS Masterbatch with improvement.

The present invention adopts following technical scheme:

A kind of dispersed method of ABS Masterbatch of improving comprises step:

(1) with ABS Masterbatch and ABS resin with required ratio mixed number minute in high-speed mixer;

(2) said mixture is added the injection machine charging aperture;

(3) add a Forced Mixing device at screw in injection molding machine head place,, ABS resin is fully mixed with Masterbatch, reach toner finely dispersed effect in resin matrix through powerful mixing in the Forced Mixing device.

Rotating speed in the described step (1) is 500-1000r/min, and mixing temperature is a room temperature-50 ℃, and incorporation time is 1-4min.

Described machine barrel is respectively distinguished temperature: one section 180-220 ℃, and two sections 185-230 ℃, three sections 190-225 ℃, four sections 190-225 ℃.

Each injection section condition is in the described step (2): one section 50-55/50-55 of injection, and two sections 40-45/40-45 of injection, three sections 40-45/40-50 of injection, four sections 40-45/40-45 of injection, five sections 40-45/40-45 of injection, wherein unit is pressure MPa/ speed mm/s.

Described Forced Mixing device is that feed end is threaded, the open circles column type structure of other end band injection machine nozzle, or have the open circles column type structure of the internal thread that can be connected with nozzle; Cylindrical inner wall is provided with the step or the protruding step or the helical groove of some depressions; Resin melt is through these steps or groove the time, and the runner than otherwise smooth has increased mixed process, thereby makes the product color of injection moulding more even.

The invention has the advantages that by powerful mixing in the Forced Mixing device, ABS resin fully to be mixed with Masterbatch, to reach toner finely dispersed effect in resin matrix through adding a Forced Mixing device at screw in injection molding machine head place; Method is simple for this, solved the uneven problem of Masterbatch dispersion in the large-scale injection molding.

Description of drawings

Fig. 1 is the structural representation that improves Masterbatch dispersed equipment in matrix resin.Among the figure: 1 is that charging aperture, 2 is that screw cylinder, 3 is static mixer;

Static mixer shown in Fig. 2 a is that described feed end is threaded, the open circles column type structure of other end band injection machine nozzle;

Static mixer shown in Fig. 2 b is that feed end is threaded, and the other end has the open circles column type structure of the internal thread that can be connected with nozzle.

The specific embodiment

Embodiment 1

The process for dispersing of white ABS Masterbatch:

Step 1: take from white ABS Masterbatch 100g of system and ABS resin 2000g and be placed in the high-speed mixer, the rotating speed with 500-700 rev/min under the room temperature mixed 2 minutes;

Step 2: said mixture is added the injection machine charge door.Machine barrel is respectively distinguished temperature such as following table 1, injection pressure and velocity amplitude such as table 2;

Step 3: a Forced Mixing device is installed at screw in injection molding machine head place,, ABS resin is fully mixed with Masterbatch through powerful mixing in this device.

Table 1

One section	Two sections	Three sections	Head
				210℃	220℃	205℃	205℃

Table 2 injection (pressure MPa/ speed mm/s)

One section of injection	Two sections of injections	Three sections of injections	Four sections of injections	Five sections of injections
					55/55	45/45	40/50	40/40	40/40

Condition shown in table 1 and the table 2 is applicable to above-mentioned 1,2 two step.

Use feed end to be threaded the open circles column type structure of other end band injection machine nozzle in the present embodiment.Cylindrical inner wall is provided with the step of some depressions.

With this understanding, make the product of single weight at 1.4kg with the injection machine of describing in the common injection machine and the embodiment of the invention 1 respectively, its aberration Δ E drops to 0.18 from 0.5.

Embodiment 2

The process for dispersing of red ABS Masterbatch:

Step 1: get commercial red ABS Masterbatch 300g, ABS resin 2000g is placed in the high-speed mixer, and the rotating speed with 600-700 rev/min under the room temperature mixed 2 minutes;

Step 2: said mixture is added the injection machine charge door.Machine barrel is respectively distinguished temperature and injecting condition such as following table 3 and table 4;

Table 3

One section	Two sections	Three sections	Head
				195℃	200℃	195℃	190℃

Table 4

Injection (pressure MPa/ speed mm/s)

Use feed end to be threaded in the present embodiment, the other end has the open circles column type structure of the internal thread that can be connected with nozzle; Cylindrical inner wall is provided with the step of some convexities;

With this understanding, make the product of single weight at 2kg with the injection machine of describing in the common injection machine and the embodiment of the invention 2 respectively, its aberration Δ E drops to 0.12 from 0.42.

Embodiment 3

The process for dispersing of blue ABS Masterbatch:

Step 1: take from blue ABS Masterbatch 400g of system and high temperature resistant ABS resin 2000g, be placed in the high-speed mixer, the rotating speed with 500-600 rev/min under the room temperature mixed 2 minutes;

Step 2: said mixture is added the injection machine charge door.Machine barrel is respectively distinguished temperature such as following table 5, injection pressure and velocity amplitude such as table 6;

Table 5

One section	Two sections	Three sections	Head
				220℃	230℃	215℃	215℃

Table 6 injection (pressure MPa/ speed mm/s)

One section of injection	Two sections of injections	Three sections of injections	Four sections of injections	Five sections of injections
					55/55	45/45	40/40	40/40	40/40

Use feed end to be threaded in the present embodiment, the other end has the open circles column type structure of the internal thread that can be connected with nozzle; Cylindrical inner wall is provided with some helical grooves;

With this understanding, make the product of single weight at 1.7kg with the injection machine of describing among common injection machine and the present invention respectively, its aberration Δ E drops to 0.13 from 0.41.

The above-mentioned description to embodiment is can understand and use the present invention for ease of the those of ordinary skill of this technical field.The personnel of skilled obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not breaking away from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.

Claims

1. one kind is improved the dispersed method of ABS Masterbatch, it is characterized in that: comprise step:

(2) said mixture is added the injection machine charging aperture;

(3) add a Forced Mixing device at screw in injection molding machine head place,, ABS resin is fully mixed with Masterbatch, to reach toner finely dispersed effect in resin matrix through powerful mixing in the Forced Mixing device.

2. according to the said method of claim 1, it is characterized in that: the rotating speed in the described step (1) is 500-1000r/min, and incorporation time is 1-4min; Mixing temperature is a room temperature to 50 ℃.

3. according to the said method of claim 1, it is characterized in that: described machine barrel is respectively distinguished temperature and is: one section 180-220 ℃, and two sections 185-230 ℃, three sections 190-225 ℃, four sections 190-225 ℃.

4. according to the said method of claim 1; It is characterized in that: each injection section condition is in the described step (2): one section 50-55/50-55 of injection; Two sections 40-45/40-45 of injection, three sections 40-45/40-50 of injection, four sections 40-45/40-45 of injection; Five sections 40-45/40-45 of injection, wherein unit is pressure MPa/ speed mm/s.

5. according to the said method of claim 1, it is characterized in that: described Forced Mixing device is that feed end is threaded, the open circles column type structure of other end band injection machine nozzle, or have the open circles column type structure of the internal thread that can be connected with nozzle; Cylindrical inner wall is provided with the step or the protruding step or the helical groove of some depressions.