CN100516131C - Soft PVC plastic for electric wire and cable - Google Patents

Abstract

The PVC plastic material for electric wire and cable consists of PVC resin 100 weight portions, plasticizer 30-100 weight portions, magnesia 2-5 weight portions, zinc oxide 3-5 weight portions, stearic acid 2- 4 weight portions and filler 5-60 weight portions. The facile and cheap magnesia and zinc oxide as the heat stabilizer result in no toxicity, no bad smell, no harm to the operator, less environmental pollution, no degradation on the electric performance and secondary machining performance of the product. The PVC plastic material is superior to that with lead salt as stabilizer in that it has obviously raised heat stability and weather resistance.

Description

Soft PVC plastic for electric wire and cable

Technical field

The present invention relates to a kind of electric wire igelite, especially have environmental protection, Heat stability is good, polyvinyl chloride cable material that cost is low.

Background technology

Polyvinyl chloride is because of its unique advantage, cable insulation or sheath preferred material have been become, but raising day by day along with environmental requirement, lead salt stabilizer is eliminated gradually in the Production of PVC, some new thermo-stabilizers constantly occur, as metallic soap class, compound stablizer, organotin (antimony) class, rare earth class stablizer.But it is not enough separately that these thermo-stabilizers all still exist, and as organotin stabilizer, still has toxicity mostly, and off-odor is arranged; Metal soap stabilisers, cooperate intercalating agent as disclosed calcium stearate of Chinese patent CN1032014C and Zinic stearas, the disclosed stable organotin compound of Chinese patent CN1088930, often thermostable effect is relatively poor during the single use of this type thermal stabilizing agent, also need depend on other high performance auxiliary stabilizers, increase cost; Rare-earth stabilizer is still the mixture that adopts rare earth and lead salt at present mostly, has just reduced the lead salt consumption, does not eliminate the environmental issue that lead salt brings fully, and exists oilness and the bad problem of processibility.

The disclosed a kind of electric wire soft polyvinyl chloride plastic of Chinese patent CN00112518.4, it is to be 100 parts of polyvinyl chloride by weight proportion, 30～90 parts of primary plasticizers, 3～10 parts of calcium-zinc composite stabilizing agents, 2～15 parts of co-plasticizer, 5～50 parts of compositions of filler.Described calcium-zinc composite stabilizing agent is by calcium hydroxide and zinc hydroxide mixture and higher fatty acid saponification reaction, through the concentrated gained of purifying.Though its one package stabilizer has overcome the environmental pollution shortcoming that lead stabilizer brought, one package stabilizer needs to make separately separately, needs elder generation after saponification reaction, and concentrated through purifying again, processed complex has increased cost; Secondly, stablizer starting material---calcium hydroxide and zinc hydroxide, price is higher relatively, has also increased the cost of CABLE MATERIALS.

Summary of the invention

The objective of the invention is to overcome the deficiency of above-mentioned prior art, providing a kind of does not have undesirable action to people and environment, Heat stability is good, the soft PVC plastic for electric wire and cable that cost is low.

The object of the invention realizes, the main improvement is test and Selection rubber grade lightweight activated magnesia, indirect method production rubber grade white zinc oxide are made thermo-stabilizer, and with lipid acid, coupling agent treatment, instead of hydrogen calcium oxide and zinc hydroxide and higher fatty acid saponification reaction one package stabilizer.Specifically, soft PVC plastic for electric wire and cable of the present invention, substantially by following weight than forming:

100 parts of polyvinyl chloride (PVC) RESINS;

30～100 parts in softening agent;

3～5 parts of rubber grade lightweight activated magnesias (MgO);

3～5 parts of indirect method production rubber grade white zinc oxides (ZnO);

2～4 parts of stearic acid;

5～60 parts of stopping composition

Described magnesium oxide and zinc oxide are through lipid acid and coupling agent treatment.

In addition,, can also add the inorganic or tinting materials such as pigment dyestuff, dyestuff of different colours of common amount in the CABLE MATERIALS, such as but not limited to as carbon black, titanium dioxide, pthalocyanine blue, phthalocyanine green tinting material according to service requirements.According to some special occasions service requirementss, can also add CABLE MATERIALS with the function endowing auxiliary agent of measuring usually, as termite repellent, fire retardant, mould inhibitor etc.

Polyvinyl chloride (PVC) RESINS of the present invention is the CABLE MATERIALS polyvinyl chloride (PVC) RESINS, a kind of better is that to select mean polymerisation degree for use be 1000～1300 polyvinyl chloride (PVC) RESINS, and for example CABLE MATERIALS is with SG-1 type one-level A, the loose type resin of SG-2 type one-level A or XJ 1 one-level A, XJ 2 one-level A tight type resins.

Said softening agent is common cable used for polyvinyl-chloride resin softening agent, have no special requirements, look different require to comprise primary plasticizer and/or extender plasticizers, primary plasticizer is the mixture of one or more in phthalate, terephthalate class, trimellitic acid class, the aliphatic dibasic acid ester for example; Extender plasticizer, for example one or more mixture of epoxy ester series, phosphoric acid ester, chlorine-containing compound.

Described stearic acid, stopping composition also are commonly used in the polyvinyl chloride cable, and such as but not limited to the industrial stearic acid of 200 types, treated carbonates, modified calcinated kaolin have no special requirements.At some the particular requirement use occasion is arranged, can also be as common polyvinyl chloride cable material, weighting agent can partly or entirely adopt some functional fillers.

Electric wire igelite of the present invention, under stearic acid lubricant existence condition, adopt rubber grade lightweight activated magnesia, the rubber grade zinc oxide that indirect method is produced also is used as thermo-stabilizer, magnesium oxide is as acid acceptor, zinc oxide has good heat aging performance, both also use, better produced synergistic effect, thermostable effect is better, and under stearic sufficient lubrication effect, hybrid process can not sticked, especially magnesium oxide, zinc oxide is through lipid acid, after coupling agents etc. are handled, with polyvinyl chloride consistency is preferably arranged, and good dispersity.Thermo-stabilizer of the present invention, nontoxicity, no stink, toxic substance such as not leaded, chromium, barium, dibutyl tin, the entail dangers to operator is not healthy, and environmental pollution is little; Secondly, the rubber grade zinc oxide that rubber grade lightweight activated magnesia, indirect method are produced is other stablizers relatively, and wide material sources relatively are easy to get, cheap, and easily dispersion, good processability, proportioning are little, can with the once processing simultaneously of other material, need not independent reaction, produce simply, cost is low; And do not change color, do not reduce the electrical property and the suitability for secondary processing of goods.Not only the more traditional lead salt stabilizer of its heat-resistant stability and weather resistance is significantly improved, accepting Congo red test in the Brabender plastometer all loses obvious visible HCL and emits thing, three months natural climates of given the test agent wear out and almost do not show visible change, and every after tested performance meets the soft PVC plastic for electric wire and cable requirement fully.

Below in conjunction with several non-limiting examples, further specify the present invention.

Embodiment

Embodiment 1: insulation level 70 ℃ of flexible polyvinyl chloride cable materials (weight part)

100 parts of polyvinyl chloride (PVC) RESINS (SG-2 type);

24～26 parts of dioctyl phthalate (DOP)s;

15～17 parts of dioctyl terephthalates;

4～5 parts in magnesium oxide (MgO);

4～5 parts in zinc oxide (ZnO);

2 parts of stearic acid;

10～20 parts of modified calcinated kaolin;

Pigment is an amount of.

Embodiment 2: 70 ℃ of flexible polyvinyl chloride cable materials of sheath level (weight part)

100 parts of polyvinyl chloride (PVC) RESINS (SG-2 type);

42～44 parts of dioctyl phthalate (DOP)s;

5～7 parts of clorafins;

3～4 parts in magnesium oxide (MgO);

3～4 parts in zinc oxide (ZnO);

2 parts of stearic acid;

10～20 parts of treated carbonatess;

Pigment is an amount of.

Embodiment 3: insulation level 105 ℃ of flexible polyvinyl chloride cable materials (weight part)

100 parts of polyvinyl chloride (PVC) RESINS (SG-1 type);

24～26 parts of dibutyl phthalates;

50～55 parts of bis(pentaerythritolester)s;

4～5 parts in magnesium oxide (MgO);

4～5 parts in zinc oxide (ZnO);

2 parts of stearic acid;

2～5 parts of treated carbonatess;

Pigment is an amount of.

Magnesium oxide, zinc oxide adopt the rubber grade zinc oxide of rubber grade lightweight activated magnesia, indirect method production respectively, and mix stir process (known method) with lipid acid and vinyltrimethoxy silane coupling agent.

Each forms batching with above-mentioned CABLE MATERIALS, through mediating at a high speed, extrudes for 150-170 ℃, and pelletizing packages spare.

Claims (2)

1, soft PVC plastic for electric wire and cable, substantially by following weight than forming:

100 parts of polyvinyl chloride (PVC) RESINS;

30～100 parts in softening agent;

3～5 parts of rubber grade lightweight activated magnesia MgO;

3～5 parts of indirect method production rubber grade white zinc oxide ZnO;

2～4 parts of stearic acid;

5～60 parts of stopping composition

Described magnesium oxide and zinc oxide are through lipid acid and coupling agent treatment.

2,, it is characterized in that said polyvinyl chloride (PVC) RESINS mean polymerisation degree is 1000～1300 according to the described soft PVC plastic for electric wire and cable of claim 1.