JPS60219249A - Polyvinyl chloride resin composition - Google Patents

Abstract

PURPOSE:The titled composition generating little poisonous gas on burning, made by incorporating an ethylene-vinyl acetate copolymer, a nitrile butadiene rubber, fine particulate CaCO3, a plasticizer, and a flame retardant containing no halogen into a PVC resin. CONSTITUTION:To 100pts.wt. PVC resin are incorporated 5-25pts.wt. ethylene- vinyl acetate copolymer containing at least 60wt% vinyl acetate, 5-20pts.wt. nitrile butadiene rubber, 55-80pts.wt. fine particulate CaCO3, 30-60pts.wt. plasticizer (e.g. dioctyl phthalate), and 5-30pts.wt. flame retardant containing no halogen (e.g. Sb2O3). EFFECT:A PVC resin composition having well-balanced properties such as processability, mechanical properties, low-temperature resistance, oil resistance, and flexibility can be obtained. USE:Coating material for wire and cable.

Description

[Detailed description of the invention] Industrial application field> The present invention relates to a polyvinyl chloride resin mixture that is flame retardant and generates a small amount of toxic gas such as salt gas when burned. In particular, 'l'i, I; is used as an admixture useful as a material for drawing wires and cables.

<Background technology and its problems> In recent years, when fires occur, the release of toxic gases from K such as various synthetic resins or their mild products has become a major problem, and various studies are being carried out. being done.

Various improvements have been made to polyvinyl chloride resin blends F+3 from this perspective, but these measures have improved other properties such as processability, mechanical properties, cold resistance, and oil resistance. There were problems such as a decline in

<Object of the invention> The present invention has the following features: 1. This was done in view of the fact that in the conventional polyvinyl chloride resin mixtures mentioned above, if the generation of toxic gases such as hydrochloric acid gas is suppressed, other properties tend to deteriorate. It is. The purpose is to obtain a polyvinyl chloride resin mixture that suppresses the generation of toxic gases and also has a good balance in other properties.

K reduces toxic gases such as hydrochloric acid gas (H6f) generated from vinyl resin mixtures. Adding a substance that produces a substance that is 6% higher than the polyvinyl chloride resin! Relative mixing of polyvinyl chloride resin by blending with other resins that have good compatibility with fats and do not cause deterioration of other physical properties and do not generate hydrochloric acid gas,
This invention was developed focusing on the fact that it is preferable to reduce t.

Capture substances such as generated hydrochloric acid gas include calcilum (Ca), paliu A (Ba), and potassium (K).
), magnesium (Mg), and other metal compounds are also considered, but it is preferable to use inexpensive fine granular uric acid calcium. .EVA)
, nitrile butadiene pum (hereinafter referred to as NB'R)
is used. Both of these six resins have solubility indexes (s, p values) that can be polychlorinated.

On the other hand, when used as a coating material for electric wires and cables, C plasticizer is added because appropriate workability and fusibility are required. Furthermore, by relatively reducing the amount of polyvinyl chloride resin mixed, an appropriate amount of flame retardant (one that does not contain a halogen element) is mixed. -7 Therefore, the composition of the present invention consists of polychlorinated pinic resin 100 main nails and EV'A (containing acetic acid beer 60-
or above) 5-25 heavy sweeping section, N, B R55-8
0 parts by weight, 30 to 60 parts by weight of plasticizer, and 5 to 3 parts by weight of flame retardant.
0 Jukeibu Main Tsume Naru.

As a result, EVAii polyvinyl chloride 404 and fat remover are compatible even at the same ratio, imparting non-volatile and non-migrating properties to the resulting mixture, and allowing for high loading of inorganic substances. Provides improved oil resistance, heat resistance, and cold resistance. However, if it is less than -511 parts by weight, the above-mentioned YAE imparting effect cannot be obtained, and if it exceeds 25 parts by weight,... , +
C) As the melt viscosity of the mixture becomes higher, the melt viscosity of the mixture becomes higher and the mixture becomes difficult to press for a long time, so the mixing amount is preferably 5 to 25 parts by weight.

By mixing EVA in the above range, the M properties of the mixture are considerably improved, but more preferably, as with EVA,
When NB'R, which has good compatibility and properties with polyvinyl chloride (!7J), is used in combination with E'VA, various properties are further improved, resulting in a mixture with a good grade-C balance. The reason for setting the mixing amount of NBR to 5 to 20 parts by weight is that 5 parts by weight does not have the effect of adding NBR, and 20 parts by weight cannot be obtained.
If it exceeds the overlapped section, it is not only unfavorable in terms of cost, but also the basic characteristics of the polyvinyl chloride tree Jlft will be lost.

Furthermore, the reason why calcium citrate is made into fine particles is that when capturing hydrochloric acid gas, etc., a large '@ order reaction effect can be obtained by increasing the surface area. And the mixing amount is large t
This is preferable because it has a very large capture effect, but
If the amount is too large, unfavorable points will appear in low-temperature properties, physical properties, processability, flame retardance, etc., so 55 to 80 parts by weight is practically preferable. Note that if the amount is less than 555 parts by weight, sufficient addition effects will not be exhibited.

In addition, the above-mentioned ETA and NBR are non-extractable and non-migratory and have the effect as a polymer plasticizer, but in this mixture,
In addition, common plasticizers are also tolerated. For example, phthalate esters (DOP, n-DOP, DIDP, etc.), aliphatic 2#M base acid esters (DOA, DOS, Do
Z, etc.), Phosphate A; (TCP, TOP, etc.),
Examples include epoxy plasticizers, trimelli-ul-acid plasticizers, etc., and if the amount added is less than 300 parts by weight,
Good workability and flexibility cannot be obtained, and on the contrary, if the amount exceeds 60 parts by weight, problems arise in practicality due to deterioration of mechanical properties.

Examples of flame retardants that do not contain halogen elements include antimony trioxide, zinc borate, aluminum hydroxide, magnesium hydroxide, red phosphorus, and phosphorus flame retardants (tricresyl phosphate, triphenyl phosphate, etc.) , barium metaborate, etc., to prevent a decrease in flame retardancy due to a decrease in the relative amount of polyvinyl chloride resin mixed. If the thickness is less than 5 parts, sufficient flame retardancy cannot be obtained, and if it exceeds 30 parts, the mechanical properties, oil resistance, heat resistance, strength, etc. will deteriorate. Therefore, the amount added is
5 to 30 weights" 11: parts.

If necessary, other additives such as a λ1 coloring agent, a stabilizer, a lubricant, a foaming agent, etc. can be added as appropriate.

<Example> The 11th polyvinyl chloride resin mixture of the present invention was prepared as shown in 1. my own m
A prototype was made using the formulation shown in Table 1. What 3? For Tani's consideration, a C prototype was made using the conditions of the present invention as an example of a hood with 11 items that do not cost 11 yen.

When we conducted 4Vlr tests on each of the above-mentioned products, we obtained the results as shown in the following εj'52 table.

From this result, it is clear that the oxygen index is 30tj degrees, and the FIjJ oiliness and embrittlement temperature hx are improved. <Effects of the Invention> As explained above, the present invention provides polyvinyl chloride resin with Fine particle LA that suppresses the generation of right-handed gases such as hydrochloric acid gas
EVA and NBR that improve properties such as calslum, oil resistance and heat resistance, plasticizers that improve workability and flexibility, and negative IL fuel that improves flame retardance are mixed in the optimal mixing ratio. Therefore, an excellent mixture with well-balanced properties, especially 11. It is possible to obtain a polyvinyl chloride resin that is optimal as a covering material for wires and cables.

Claims (1)

[Claims] 100 parts by weight of polyvinyl chloride resin, 5 to 25 parts by weight of ethylene-vinyl acetate copolymer (containing vinyl acetate J6" or more), and 5 to 20 parts by weight of nitrile butadiene rubber.
55 to 80 parts by weight of finely divided calcium chloride, 30 to 6034 parts of a plasticizer, and 5 to 30 parts of a twist retardant not containing a halogen element. .