CN102504441A - Lead-free PVC-U (rigid Polyvinyl Chloride) formula for draining - Google Patents

Abstract

The invention provides a lead-free PVC-U (rigid Polyvinyl Chloride) formula for draining. The formula comprises PVC resin powder, organic triple superphosphate, an OBS (Organizational Breakdown Structure) organic stabilizer, calcium stearate, PE (Poly Ethylene) wax, an impact-resistant agent, titanium pigment and a processing aid. Compared with the prior art, the formula has the advantages that: the OBS organic stabilizer is adopted, so that lead is not container, high stability and low production cost are achieved, and the formula is suitable for producing safe and sanitary draining pipelines.

Description

A kind of unleaded draining is filled a prescription with PVC-U

Technical field

The present invention relates to plastic cement pipe technology field, relate in particular to a kind of unleaded draining and fill a prescription with PVC-U.

Background technology

Lead is a kind of pollutent, in case enter environment, can in environment, be detained permanent for some time.Plumbous have stronger potentiality toxicity to many vital tissues, so lead is put in the strong pollutent scope always.In the PVC-U prescription that water shoot is used, need use stablizer.Generally all contain lead in the stablizer of good stability, pollute easily.Calcium zinc, rare earth, organotin are lead-free stablizers, but the later stage stability of calcium zinc, rare earth is bad, and the words of use need add many deals, and toxicity symptom can appear in organotin contact for a long time, and direct labor's health is worked the mischief.

Summary of the invention

The present invention has overcome deficiency of the prior art, provides a kind of unleaded draining to fill a prescription with PVC-U, and is neither leaded, has high stability again.

In order to realize above-mentioned purpose, adopt following technical scheme: a kind of unleaded draining is filled a prescription with PVC-U, and the component and the weight part that comprise are following:

Polyvinyl chloride resin powder 100

Organic coarse whiting 3-10

OBS organic stabilizer 1-5

Calcium stearate 0.5-1.5

PE wax 0.2-1.5

Anti-impact agent 1-8

White titanium pigment 1-5

Processing aid 1-3.

Compare with traditional stablizer, OBS has price competitiveness, has done some improvement at aspect of performance simultaneously, for example low migration, low smell, low volatility, low organic cpds effusion property, good form and aspect, the splendid transparency etc. in earlier stage.PVC goods with the processing of OBS stablizer also are fit to recycling, carry out secondary processing.PVC-U prescription of the present invention adopts the OBS organic stabilizer, and is not leaded, good stability.Add suitable auxiliary agent,, be applicable to and produce nontoxic PVC-U drainage pipe through mixed at high speed.

As a kind of preferred version, said polyvinyl chloride resin powder adopts the SG-5 type.The intensity of polyvinyl chloride resin SG-5 type material, rigidity, toughness, heat-resisting and lower temperature resistance is moderate, and the moulding processing characteristics is also moderate, is suitable as the material of this PVC-U prescription.

Compared with prior art, the present invention adopts the OBS organic stabilizer, and is neither leaded, and stability is good again, and production cost is low, is suitable for the drainage pipeline of production safety health.

Embodiment

Below in conjunction with embodiment the present invention is done further description.

Adopting prescription provided by the invention to produce tubing may further comprise the steps:

1, prepares the dosage of each component;

Each component that 2, will prepare stirs in the high speed blender, when mixture temperature reaches 120 ℃, puts into the cold mixed stirring of the cold mixed stirrer of low speed, and when mixture temperature reached 40 ℃, discharging was for use;

3, with extruding machine-shaping in the material input conical double screw extruder that mixes, set 120-200 ℃ of machine barrel Heating temperature, die temperature 120-200 ℃, screw speed 15-50rpm, reinforced rotating speed is at 5-50rpm.

The component of specific embodiment, weight part and machined parameters are as shown in table 1,

?	Embodiment one	Embodiment two	Embodiment three
				PVC (SG-5 type)	100	100	100
Organic coarse whiting	8.0	5.0	3.0
				The OBS organic stabilizer	2	2.5	3.0
Calcium stearate	0.5	0.5	0.5
				PE wax (YL-100)	1.5	1.0	0.6
Anti-impact agent (B56)	2	1.5	1.2
				White titanium pigment (anatase titanium dioxide)	1.5	1.5	1.5
Machine barrel, die head temperature	130-160℃	120-170℃	130-200℃
				The main-machine screw rotating speed	30rpm	40rpm	40rpm
Reinforced rotating speed	25rpm	30rpm	40rpm

Table 1

Through the tank cooling, cut off after material is extruded from the mouth mould, can obtain unleaded draining and use PVC-U tubing according to desired length.

Claims (2)

1. a unleaded draining is filled a prescription with PVC-U, it is characterized in that, comprises the component of following parts by weight:

Polyvinyl chloride resin powder 100

Organic coarse whiting 3-10

OBS organic stabilizer 1-5

Calcium stearate 0.5-1.5

PE wax 0.2-1.5

Anti-impact agent 1-8

White titanium pigment 1-5

Processing aid 1-3.

2. PVC-U prescription according to claim 1 is characterized in that said polyvinyl chloride resin powder adopts the SG-5 type.